**All Participants in our Kids Divisions are permitted to use personal RaceCeivers during practice and qualifying sessions. Track Officials will notify parents and drivers if Officials will be controlling the RaceCeivers during heat races and main events.  

**Track RaceCeiver Channel: 454.000

** Division Champion must move up to the next division if they are age appropriate and family and track officials agree! Must be a Full Season which is 10 plus events!

** Birth Certificates are MANDATORY at the beginning of every season!!! 

** All Drivers 13 and under will be required to fill out a waiver before they are allowed to compete in any events!

 

** Regular gas is defined as 87-octane. All karts that are required to run regular gas will be required to purchase fuel from Propst Superette #6. We will be checking the top 5 karts to make sure they are running regular gas from Propst Superette #6. 

Propst Superette #6

3752 NC Hwy 16 

Taylorsville, NC 28681

JuiceBox Division

 

  • Ages: 2-5 years old (as of January 1, 2025)
    • Radio Flyer ultimate go kart 24v ONLY! Must be original equipment from the manufacturer! NO MODIFICATIONS! (This is a performance based rule, this does not include bodies, fairings, steering wheels or decals) Parental common sense is necessary. Plastic Tires from the manufacturer only. Helmets and Closed Toed Shoes REQUIRED! 1 parent on track only!
  • NO MONETARY AWARDS! Driver will race for free!
  • Radio Flyer Ultimate Go karts can be purchased from Amazon, Walmart and the Radio Flyer website!
  • Please change the stock number "7" to your favorite number. This helps each kid stand out and makes it easier to score!
  • This is for the kids that are still standing on the fence to have a chance to hit the track during the day, let's keep it fun and safe for them! Any infractions to the rules will not receive any awards and be asked to correct by the next event.

 

Beginner PeeWee

 

  • Ages: 3-5 years old 
  • Motor: Stock 79cc Predator Engine 
    • Out of the box/crate WITH governor in place
    • No modifications of any kind
    • Throttle screw is to be restricted at the track by track officials.
  • Fuel: Regular Gas from Propst Superette #6
    • The top 3 karts must remain in the tech area to CHECK YOUR FUEL until cleared by tech officials ONLY. If your kart leaves the tech area without permission from the tech officials ONLY you will be DQ’ed from the event.
  • Clutch/Gear: 11t clutch with 60 rear gear
  • Weight: No Minimum Weight
  • Tires: Open Tires, NO PREP
    • The top 3 karts must remain in the tech area to CHECK YOUR TIRES until cleared by tech officials ONLY. If your kart leaves the tech area without permission from the tech officials ONLY you will be DQ’ed from the event.
  • Working RaceCeivers mandatory. (Channel: 454.000)

 

PeeWee

 

  • Ages: 5-8 years old 
  • Motor: Stock 212 Predator Engine 
    • Out of the box/crate WITH governor in place
    • No modifications of any kind
    • Throttle screw is to be restricted at track by track officials. 
    • Must run GREEN PLATE! (.425 opening) 
      • The top 3 karts must remain in the tech area to CHECK GREEN PLATES until cleared by tech officials ONLY. If your kart leaves the tech area without permission from the tech officials ONLY you will be DQ’ed from the event.
  • Fuel: Regular Gas from Propst Superette #6
    • The top 3 karts must remain in the tech area to CHECK YOUR FUEL until cleared by tech officials ONLY. If your kart leaves the tech area without permission from the tech officials ONLY you will be DQ’ed from the event.
  • Clutch/Gear: 16t clutch with 62, 63 or 64 rear gear
  • Weight:
    • Minimum: 200 lbs
    • Maximum 250 lbs
  • Tires: Open Tires, NO PREP
    • The top 3 karts must remain in the tech area to CHECK YOUR TIRES until cleared by tech officials ONLY. If your kart leaves the tech area without permission from the tech officials ONLY you will be DQ’ed from the event.
  • Working RaceCeivers mandatory. (Channel: 454.000)

 

Junior Young Guns Division

 

  • Ages: 9-12 years old
  • Motor: Stock 212 Predator Engine
    • Out of the box/crate WITH governor in place
    •  No modifications of any kind
    • Must run PURPLE PLATE! (.500 opening)
      • The top 3 karts must remain in the tech area to CHECK PURPLE PLATES until cleared by tech officials ONLY. If your kart leaves the tech area without permission from the tech officials ONLY you will be DQ’ed from the event.
  • Fuel: Regular Gas from Propst Superette #6
  • The top 3 karts must remain in the tech area to CHECK YOUR FUEL until cleared by tech officials ONLY. If your kart leaves the tech area without permission from the tech officials ONLY you will be DQ’ed from the event.
  • Clutch/Gear: 16t clutch with 62, 63 or 64 rear gear
  • Minimum Weight: 200 lbs
  • Tires: Open Tires
  • Working RaceCeivers mandatory. (Channel: 454.000)

 

Junior Predator

 

  • Ages: 12-15 years old 
  • Motor: 212 Predator Engine No modifications of any kind. Must have SCREEN in place in muffler!
    • Must run BLUE PLATE! (.550 opening) 
      • The top 3 karts must remain in the tech area to CHECK BLUE PLATES until cleared by tech officials ONLY. If your kart leaves the tech area without permission from the tech officials ONLY you will be DQ’ed from the event.
  • Fuel: Regular Gas from Propst Superette #6
    • The top 3 karts must remain in the tech area to CHECK YOUR FUEL until cleared by tech officials ONLY. If your kart leaves the tech area without permission from the tech officials ONLY you will be DQ’ed from the event.
  • Clutch/Gear: Open Clutch/Open Gear
  • Weight:
    • Minimum: 250 lbs
  • Tires: Open Tires
  • Working RaceCeivers mandatory. (Channel: 454.000)

 

Clone Red Plate

 

  • Ages: 5-7 years old 
  • Motor: Clone 
    • NKA Motor Rules with Big Pipe
    • Must run RED PLATE! (.375 opening) 
      • The top 3 karts must remain in the tech area to CHECK RED PLATES until cleared by tech officials ONLY. If your kart leaves the tech area without permission from the tech officials ONLY you will be DQ’ed from the event.
  • Fuel: Regular Gas from Propst Superette #6
    • The top 3 karts must remain in the tech area to CHECK YOUR FUEL until cleared by tech officials ONLY. If your kart leaves the tech area without permission from the tech officials ONLY you will be DQ’ed from the event.
  • Clutch/Gear: 16t clutch with 69 rear gear
  • Weight:
    • Minimum: 240 lbs
  • Tires: Open Tires, NO TRACKSIDE PREP
    • NO TRACKSIDE PREP is no prepping at the track. The rule is as simple as it sounds. Prep at home, not at the track.
    • If caught PREPPING AT THE TRACK you will be given the opportunity to rent or purchase tires at the track or be disqualified from the event. NO EXCEPTIONS!
  • Treaded Option: 
    • Hoosier A-40 Treaded Tire
    • No Soaking- Dry Tire
  • Working RaceCeivers mandatory. (Channel: 454.000)


Junior 1

 

  • Ages: 7-10 years old 
  • Motor: Clone 
    • NKA Motor Rules with Big Pipe
    • Must run GREEN PLATE! (.425 opening) 
      • The top 3 karts must remain in the tech area to CHECK GREEN PLATES until cleared by tech officials ONLY. If your kart leaves the tech area without permission from the tech officials ONLY you will be DQ’ed from the event.
  • Fuel: Regular Gas from Propst Superette #6
    • The top 3 karts must remain in the tech area to CHECK YOUR FUEL until cleared by tech officials ONLY. If your kart leaves the tech area without permission from the tech officials ONLY you will be DQ’ed from the event.
  • Clutch/Gear: Open Clutch/Open Gear
  • Weight:
    • Minimum: 270 lbs
  • Tires: Open Tires, NO TRACKSIDE PREP
    • NO TRACKSIDE PREP is no prepping at the track. The rule is as simple as it sounds. Prep at home, not at the track.
    • If caught PREPPING AT THE TRACK you will be given the opportunity to rent or purchase tires at the track or be disqualified from the event. NO EXCEPTIONS!
  • Treaded Option: 
    • Hoosier A-40 Treaded Tire
    • No Soaking- Dry Tire
  • Working RaceCeivers mandatory. (Channel: 454.000)

Junior 2

 

  • Ages: 10-12 years old 
  • Motor: Clone 
    • NKA Motor Rules with Big Pipe
    • Must run PURPLE PLATE! (.500 opening) 
      • The top 3 karts must remain in the tech area to CHECK PURPLE PLATES until cleared by tech officials ONLY. If your kart leaves the tech area without permission from the tech officials ONLY you will be DQ’ed from the event.
  • Fuel: Regular Gas from Propst Superette #6
    • The top 3 karts must remain in the tech area to CHECK YOUR FUEL until cleared by tech officials ONLY. If your kart leaves the tech area without permission from the tech officials ONLY you will be DQ’ed from the event.
  • Clutch/Gear: Open Clutch/Open Gear
  • Weight:
    • Minimum: 290 lbs
  • Tires: Open Tires, NO TRACKSIDE PREP
    • NO TRACKSIDE PREP is no prepping at the track. The rule is as simple as it sounds. Prep at home, not at the track.
    • If caught PREPPING AT THE TRACK you will be given the opportunity to rent or purchase tires at the track or be disqualified from the event. NO EXCEPTIONS!
  • Treaded Option: 
    • Hoosier A-40 Treaded Tire
    • No Soaking- Dry Tire
  • Working RaceCeivers mandatory. (Channel: 454.000)

 

Junior 3

 

  • Ages: 12-15 years old 
  • Motor: Clone 
    • NKA Motor Rules with Big Pipe 
    • Must run BLUE PLATE! (.550 opening) 
      • The top 3 karts must remain in the tech area to CHECK BLUE PLATES until cleared by tech officials ONLY. If your kart leaves the tech area without permission from the tech officials ONLY you will be DQ’ed from the event.
  • Fuel: Regular Gas from Propst Superette #6
    • The top 3 karts must remain in the tech area to CHECK YOUR FUEL until cleared by tech officials ONLY. If your kart leaves the tech area without permission from the tech officials ONLY you will be DQ’ed from the event.
  • Clutch/Gear: Open Clutch/Open Gear
  • Weight:
    • Minimum: 320 lbs
  • Tires: Open Tires

 

  • Treaded Option: 
    • Hoosier A-40 Treaded Tire
    • No Soaking- Dry Tire
  • Working RaceCeivers mandatory. (Channel: 454.000)

 

Junior Stars Champ Buggy Division

 

  • Ages: 5-8 years old
  • Motor: Clone Engine
    • Must run NKA Rules
    • MUST run RED Plate! (.375 opening)
      • The top 3 karts must remain in the tech area to CHECK RED PLATES until cleared by tech officials ONLY. If your kart leaves the tech area without permission from the tech officials ONLY you will be DQ’ed from the event.
  • Fuel: Regular Gas from Propst Superette #6
    • The top 3 karts must remain in the tech area to CHECK YOUR FUEL until cleared by tech officials ONLY. If your kart leaves the tech area without permission from the tech officials ONLY you will be DQ’ed from the event.
  • Clutch/Gear: 17t clutch with 69 rear gear
  • Minimum Weight: 275 lbs.
  • Tires: Open Tires, NO TRACKSIDE PREP
    • NO TRACKSIDE PREP is no prepping at the track. The rule is as simple as it sounds. Prep at home, not at the track.
    • If caught PREPPING AT THE TRACK you will be given the opportunity to rent or purchase tires at the track or be disqualified from the event. NO EXCEPTIONS!
  • Treaded Option: 
    • Hoosier A-40 Treaded Tire
    • No Soaking- Dry Tire
  • Working RaceCeivers mandatory. (Channel: 454.000)

 

Junior Sports Champ Buggy Division

 

  • Ages: 7-14 years old
  • Motor: Clone Engine
    • Must run NKA Rules
    • MUST run GREEN Plate! (.550 opening)
      • The top 3 karts must remain in the tech area to CHECK GREEN PLATES until cleared by tech officials ONLY. If your kart leaves the tech area without permission from the tech officials ONLY you will be DQ’ed from the event.
  • Fuel: Regular Gas from Propst Superette #6
    • The top 3 karts must remain in the tech area to CHECK YOUR FUEL until cleared by tech officials ONLY. If your kart leaves the tech area without permission from the tech officials ONLY you will be DQ’ed from the event.
  • Clutch/Gear: Open Clutch and Gear
  • Minimum Weight: 315 lbs.
  • Tires: Open Tires, NO TRACKSIDE PREP
    • NO TRACKSIDE PREP is no prepping at the track. The rule is as simple as it sounds. Prep at home, not at the track.
    • If caught PREPPING AT THE TRACK you will be given the opportunity to rent or purchase tires at the track or be disqualified from the event. NO EXCEPTIONS!
  • Treaded Option: 
    • Hoosier A-40 Treaded Tire
    • No Soaking- Dry Tire
  • Working RaceCeivers mandatory. (Channel: 454.000)

 

Cadet Box Stock Wing Division

 

    • Ages: Max age 9. If age 10 before March 1, must move up (exceptions possible). 
    • Motor: Briggs LO206 (Briggsracing.com rules) with spec exhaust and air filter rule listed below 
      • MUST run RED Slide unaltered with slide lock tight. 
    • Fuel: Regular Gas from Propst Superette #6
      • The top 3 karts must remain in the tech area to CHECK YOUR FUEL until cleared by tech officials ONLY. If your kart leaves the tech area without permission from the tech officials ONLY you will be DQ’ed from the event.
    • Clutch/Gear: Open Clutch and Gear
    • Minimum Weight: 285 lbs.
    • Tires: Hoosier D20 slick; no prep/chemicals; no alterations. 
      • Front: D20 11x6.0-6
      • Right Rear: D20 11x8.0-6
      • Left Rear: 11x6.0-6 or 11x8.0-6. 
    • Must run shoe type clutch. 
    • Left side sail panel allowed (not beyond rear cage); right side not allowed. 
    • Side pod max height 12", max width 8.5". 
    • Side pods must be at least 1 inch away from every component (includes air filter). 
    • Tail cone min 7" tall and 7" long with number visible. 
    • No heating/torching tires. No grinding/sanding/wire brushing tires, cleaning with water only. 
    • Air filter can be either the stock Briggs, R2C CY-10803, or the JR0110 
    • Wing: box stock dimensions; one bend; lips <= 1 inch; flat; no airfoil.
  • Working RaceCeivers mandatory. (Channel: 454.000)

 

 

Beginner Box Stock Wing Division

 

    • Ages: 5-8 years old
    • Motor: Briggs LO206 (Briggsracing.com rules) with spec exhaust and air filter rule listed below 
      • MUST run GREEN Slide unaltered with slide lock tight. 
    • Fuel: Regular Gas from Propst Superette #6
      • The top 3 karts must remain in the tech area to CHECK YOUR FUEL until cleared by tech officials ONLY. If your kart leaves the tech area without permission from the tech officials ONLY you will be DQ’ed from the event.
    • Clutch/Gear: Open Clutch and Gear
    • Minimum Weight: 285 lbs.
    • Tires: Hoosier D20 slick; no prep/chemicals; no alterations. 
      • Front: D20 11x6.0-6
      • Right Rear: D20 11x8.0-6
      • Left Rear: 11x6.0-6 or 11x8.0-6. 
    • Must run shoe type clutch. 
    • Left side sail panel allowed (not beyond rear cage); right side not allowed. 
    • Side pod max height 12", max width 8.5". 
    • Side pods must be at least 1 inch away from every component (includes air filter). 
    • Tail cone min 7" tall and 7" long with number visible. 
    • No heating/torching tires. No grinding/sanding/wire brushing tires, cleaning with water only. 
    • Air filter can be either the stock Briggs, R2C CY-10803, or the JR0110 
    • Wing: box stock dimensions; one bend; lips <= 1 inch; flat; no airfoil. 
  • Working RaceCeivers mandatory. (Channel: 454.000)

 

Box Stock Wing Division

 

    • Ages: 9-13 years old
    • Motor:  LO206 Engine Rules Apply. MUST run BLACK slide. (Unrestricted)
    • Fuel: Regular Gas from Propst Superette #6
      • The top 3 karts must remain in the tech area to CHECK YOUR FUEL until cleared by tech officials ONLY. If your kart leaves the tech area without permission from the tech officials ONLY you will be DQ’ed from the event.
    • Clutch/Gear: Open Clutch and Gear
    • Minimum Weight: 325 lbs.
    • Tires: Hoosier D20 slick; no prep/chemicals; no alterations. 
      • Front: D20 11x6.0-6
      • Right Rear: D20 11x8.0-6
      • Left Rear: 11x6.0-6 or 11x8.0-6. 
    • Must run shoe type clutch. 
    • Left side sail panel allowed (not beyond rear cage); right side not allowed. 
    • Side pod max height 12", max width 8.5". 
    • Side pods must be at least 1 inch away from every component (includes air filter). 
    • Tail cone min 7" tall and 7" long with number visible. 
    • No heating/torching tires. No grinding/sanding/wire brushing tires, cleaning with water only. 
    • Air filter can be either the stock Briggs, R2C CY-10803, or the JR0110 
    • Wing: box stock dimensions; one bend; lips <= 1 inch; flat; no airfoil.
  • Working RaceCeivers mandatory. (Channel: 454.000)

 

Jr. Wing Division

 

    • Ages: 10-16 years old
    • This Rules Package Is Based On The 2026 Briggs & Stratton 206 Engine Platform Below Are The Only Allowed Changes From Those Rules 
    • Fuel: Unaltered Methanol Fuel. No Additives Allowed. 
    • Clutch/Gear: Open Clutch and Gear
    • Minimum Weight: 350 lbs.
    • Tires: NO Prep/Chemicals; NO Alterations 
    • Right Rear: D30 11x8-6 
      • Front Left: D20 11x6-6 
      • Front Right: D20 11x6-6 
      • Left Rear: Front: D20 11x6-6
    1. Carburetor
    2. The Carburetor Will Be Converted To Run On Methanol 
    3. Modifications Listed Below Are The Only Allowed Changes And Parts will Be Compared To A Know Stock Part 
    • Main Jet Hole Size Is Not A Tech Item But Main Jet Must Originate From Stock Main Jet 
    • Low Speed Jet Hole Size Is Not A Tech Item But Low Speed Jet Must Originate From Stock Low Speed Jet 
    • Main Fuel Nozzle Through Hole Is Non-Tech With No Other Modifications To The Nozzle 
    • There Are Two Methanol Needle Jets Available From Briggs & Stratton And One Of The Two Must Be Used Without Modifications 
    1. PT# 555649 (DID) 
    2. PT# 555691 (BHA) 
    3. Air Filter 
    4. Any Air Filter Permitted 
    5. Air Filter Must Mount Directly To Carburetor 
    6. Filter May Not Be Used As An Air Ram And Must Filter From All Areas As Raced  
    7. Any Open Areas In Filter Must Be Covered With Filter Sock 
    8. Cylinder Head 
    9. Modifications Listed Below Are The only Allowed Changes All Other Dimensions And 206 Rules Will Apply 
    10. The Cylinder Head Gasket Surface Can Be Machined 
    11. There Will NO longer Be A Overall Minimum Head Thickness Check Only A Combustion Chamber Minimum Depth Of .300 Inches Minimum 
    12. Any Single Or Dual Valve Spring Allowed 
    13. Any Aluminum Or Steel Retainers Allowed No Titanium Retainers Allowed 
    14. Head Gasket a. Cometic H3590040S MLS Head Gasket (BSA-304-40 Dyno Cams Number) Must Be Used With No Gasket Sealer To Be Used 
    15. Flywheel / Ignition System 
    16. Stock Unaltered Flywheel With Stock Unaltered Plastic Flywheel Fins 
    17. Offset Key Or No Flywheel Key Is Optional There Will Be No Ignition Timing Rule 
    18. Ignition Coil Will Be Changed To Briggs PT# 557125 "Red" 7100 RPM Coil 
    19. Engine Block And Piston 
    20. Crankcase Seals Will Be Removed And No Longer A Tech Item 
    21. Block Deck Surface May Be Machined And Piston Pop-up Cannot Exceed .035" Above The Deck Surface. When Measuring Piston Pop-up use a .500" Square Bar Stock On Parallel With Wrist Pin And Use Dial Indicator To Check Pop-up In Center Of Bar 
    22. Piston Will Be Changed To Briggs World Formula Piston And Must Remain As Supplied From Factory. Two Sizes Will Be Approved For Use 
    • PT# 557121 Std. Bore 
    • PT# 557122 +.010 Over Bore 
    1. Max Bore Will Be 2.705 For Wear 
    2. Factory Briggs Rings Must Be Used 
    • Three Rings Are Mandatory And Installed Correctly 
    • Rings Must Be Self Supporting In The Bore Of The Engine In Tech 
    • No Machining Of Rings Allowed With The Exception Of Lapping And End Gapping Maximum Ring Gap .050 
    • Rings Must Be In One Piece When Removed From Engine 
    • Minimum Width Top Two Rings .095 
    • Thickness Of Top Two Rings .059-.064 
    • Oil Ring Minimum Width .065 Ring Groove Must Be Present Expander Ring Must Be Installed But Can Be Trimmed In Overall Length 
    1. Connecting Rod 
    2. Connecting Rod Must Be Changed To ARC-6249 Billet Rod As Supplied By ARC And Will Be Compared To Know Stock Part From ARC 
    3. Camshaft 
    4. Camshaft Must Be Changed To Dyno Cams AN-Mod1-WC-CR And This Is The Only Cam Allowed 
    • Max Lift At The Cam Is .310 
    • Max Lift At The Valve Is .310 
    • Max Duration At .050 Is 248 Degrees Checked At Valve With 0 Lash 
    • Max Duration At .200 Is 153 Degrees Checked At Valve With 0 Lash
    • Compression Relief Should Be Left In Stock Form As These Engines Will Still Be Pull Started Like Current 206 Engines 
    1. Crankshaft 
    2. Aftermarket Billet Non-Adjustable Crank Gear Dyno Cams Number DC-1346 Is Allowed To Be Installed In Stock Location On The Crankshaft 
    3. Exhaust System 
    4. Engines must run an unaltered RLV 5530 exhaust pipe with unaltered RLV B91XL Muffler. 
    5. Right-Side sail panels are not allowed. Left Side sail panels are allowed but cannot extend beyond the rear cage 
    6. Must run a box stock size wing (center 32" x 35" Left board 40" long 20" high, Right board 40" long 14" high. Must be within +/- 2 inches). Measurements include any lip on the side panels. Only 1 bend is allowed. Lips cannot exceed 1 inch. Flat panel wing only. No airfoil 
    7. Must utilize a sprint car style rear bumper. No square flat kart style bumpers allowed. Must extend back a minimum of 7" from end of frame rail. (Bumper design must be approved by track management). 
    8. Maximum height for side pods are 12", Maximum width is 8.5" All side pods must be at least one inch away from EVERY component of the motor! Includes air filter! 
    9. Tail Cone must be a minimum of 7" tall and 7" long with kart number visible. 
    10. A support from the head to the exhaust pipe to ensure if the pipe breaks it stays attached to the kart. 
    11. Scatter shield on the front of the engine will be allowed. 
    • Working RaceCeivers mandatory. (Channel: 454.000)

     

    Jr. Sprint Division

     

      • Ages: Drivers ages 6 through 11 (A driver whose 12th birthday falls during the racing season will be allowed to finish the season in which they begin accruing points before their birthday. Racing season starts March 1st.) 
      • Fuel: Methanol only. Upper end lubricants and NITRO products are NOT allowed. Safety cell is recommended, but the aluminum go kart tank with a sealed lid will be allowed after tech inspection. 
      • Clutch/Gear: Open Clutch and Gear
      • Minimum Weight: 400 lbs.
      • Tires and Wheels. 
        • Wheels 8" diameter, steel or aluminum. Hoosiers required. Right rear spec tire: Hoosier Jr. Sprint 16.0/8.5/8/8 RD 20. You can groove or sipe all tires. NO TIRE DOPING. 
      • Roll cage. 
        • Roll cages shall be at least 1 inch .083 wall thickness mild steel, or 1 inch .065 wall thickness chromoly steel minimum. The front section of the cage shall be no further back than the steering wheel. Roll cage should have sufficient fore and aft bracing and strength to support the weight of the car & driver in case of an upset. Cage shall have gussets at the intersecting bars to the uprights. Bends must have at least 3-inch radius. No square or pointed corners allowed. Roll cage must be a minimum of 3 above the driver's helmet. It is mandatory to install a cross brace behind the seat to support the shoulder harness. 
      • Cockpit Controls. 
        • On and off switches must be on dash, top of the cowl or on steering wheel. On/off switch must be functional. No radio communication is allowed with the car or the driver. The box that hangs on the fence was clarified as not being radio communication to car or driver and will be allowed. (This is the infrared transmitter used to trigger the lap timer function on Mychron style devices.) 
      • Suspension. 
        • Coil-over shock or torsion bar suspension allowed. Tread max 46 inches, min 32 inches (center to center). Wheelbase max 52 inches, min 50 inches. Rear axle steel 1 1/4" min diameter or new aluminum axle. Rear wheel drive only. All suspension bolts except wheel nuts must be secured by locking device. 
      • Shocks. 
        • Aluminum or steel body shocks legal. 
      • Bodies. 
        • Sprint car design only. Tail sections must be in place for time trials and all races. Metal firewall required. No rear view mirrors. Quick release steering wheel only for entry/exit. No tops or body encasements. 
      • Transmission. 
        • Drive by engine or jackshaft mounted clutch. No axle mounted clutches. No direct drive. Chain guards required. 
      • Wings. 
        • Right side board max 42" x 20" (16" x 16" min). Left side board max 42" x 20" (18" x 18" min). Overall wing size minimum 5.5. Top wings mandatory. 
      • Hubs. 
        • Front hubs go kart type with 5/8" bearings and 5/16" wheel studs min. Rear hubs Douglas 5 x130 go kart type or equivalent. 
      • Engine Rules.
        •  For motor specs for Briggs and Stratton World Formula engine, visit Port City Raceway website at www.portcityraceway.net to download the engine rules. The ONLY exception is you may run Stainless Exhaust Valves (stock size). You may also run inserted after-market rods (stock size). 
    • Working RaceCeivers mandatory. (Channel: 454.000)



    Jr. Sprint Division

    All parts must be Briggs & Stratton factory production parts unless otherwise noted in these rules. No machining, polishing or alteration of any parts is permitted unless specifically noted in this technical manual. 

    All parts are subject to comparison with a known stock part. All dimensional specifications in this tech manual will have a plus or minus .001 inch tolerance when using dial indicators, micrometers, dial calipers or any type variable gauge, except camshaft dial indicator lobe lift values during camshaft profile check do not have the .001 inch tolerance and/or otherwise specified. The .001 inch tolerance does not apply to no/go pins and no/go gauge technical specifications. 

    717.1: Shrouds and covers: All shrouds and covers must be run as supplied except any color is legal. Cylinder shield may be bent slightly or cut around the spark plug hole to allow fitting cylinder head temperature lead and clearance for Coil Ground lead. Flywheel finger guard cover, Top Cover and  Plate are non tech items. They are replaced by Part # 555699.  

    717.2 : Header and silencer  

    717.2.1: Factory RLV header part number EXP 5930.. Any exhaust gasket or no exhaust gasket allowed. Sealer allowed on header. Header nuts are not required to be safety wired. Bottom bracing must be bolted to the head. Factory header may be cut and turned to fit the car as long as the overall length and tube size remains the same as the stock factory header. No additional grinding or 

    machining is legal.  OAL 19.0” +/- ½ “measured on the inside diameter with a ¼” wide tape measure. OD .9375” x .065 wall (ID .807 +/-.005). Ceramic coating of the pipe is legal. It is also legal to add a small spot weld on header OD to prevent the muffler from sliding up the pipe. 

    717.2.2: Exhaust gas temp sensor is optional. 

    717.2.4: RLV Silencer #4100 required. Baffle rattle is allowed however if baffles have been altered or removed, the muffler will be deemed illegal.  Baffle holes are .128 inch(#30 drill bit) no go gauge. Ceramic coating is allowed  

    717.2.5: Springs attaching Silencer to header must be safety wired. Silencer must be attached and functional to header or car at the end of the race or driver and car will be DQ’d  

    717.3 : Electric starter: Starter motor must be operational and capable of starting engine. The battery must be a minimum of 8 AH rating  and capable of starting a warm engine. Recoil starter and flywheel starter cone optional. Starter support bracket P\N 557119 is  optional.  

    717.4: Air filter must be Green Brand 40 X 75 filter attached directly to Carb. No Extensions or Adapters. 

     717.5 : Spark plug: Any commercially available, 10 mm thread, spark plug allowed. The spark plug must be stock as OEM manufactured. Indexing washers are allowed. Removal of factory sealing washer is not allowed unless using a head temp sensor ring.  

    717.6: Fuel pump must be Briggs and Stratton number 597338 or 808656. Must be pulsed from the intake manifold only. 

    717.7: Clutch: May be engine or Jackshaft mounted. Belt or chain drive from engine to jackshaft. May use #219 or #35 sprocket. No torque converter or shifter type allowed.  

    717.8: Rev Limiter: Rev Limit is 7100 rpm +/- 50 rpm. Rev limiter may be checked at any point in the race program. Rev limit will  be checked with a suitable memory capable tachometer attached to the plug lead and the motor accelerated until the rev limiter  begins 

    to function. All rev limiters must function within 100 rpm when checked with the same instrument. Each competitor is allowed  one courtesy check of the rev limiter with the instrument to be used at the event.  

    717.9: Fuel: Pure Methanol only! Specific Gravity for Methanol is 0.7913@68 degrees F. Use a Temperature  Correction Chart to determine exact SG. Legal Methanol Corrected Specific Gravity is 0.760 to 0.800. VP M1 Methanol is  the standard for Zeroing a Digitron or any device for testing Methanol for power enhancing additives. VP M3 and M5 and other  brands of like chemistry are 

    Illegal.

    717.9.1: OIL: Any crankcase oil is allowed BUT MUST PASS THE BURN TEST AND/OR THE SNIFFER TEST. (Recommend TIFF Industries Sniffer) 

    717.10 Carburetor: Stock Walbro PZ26 carburetor only. No alterations allowed; choke excluded. Carb rubber mount boot Briggs #557130 is required. New carburetor may have different color and exterior appearance. Carburetor float and needle. It is now legal to use aftermarket plastic ( black or white color ) floats and needles for the WF carburetors. However these aftermarket parts must have the same basic shape, size and function as OEM parts. This update is necessary because the current Walbro OEM supplier is no longer manufacturing these components for replacement. 

    717.10.2: Slide must remain unaltered. Unaltered Stock needle marked CDB is required, 

    717.10.3: Choke assembly is optional and may be removed and shaft holes plugged with silicon. If choke is retained choke lever may be fastened open with spring, rubber band or tie wrap. 

    717.10.4: Methanol Jets : Drilling or reaming of gas carb jets is allowed: Nozzle .111” no go; pilot\slow jet .026” no go; Main jet .072” no go. NOGO Gauge must NOT pass thru. No drilling / chamfering and or modifications to the main jet E tube. No additional tolerance is allowed. 

    717.10.6: Venturi measurement

    717.10.6.1: Vertical .9902” max 

    717.10.6.2: Horizontal .7382” max 

    717.11: Camshaft: No alteration of the camshaft by machining, polishing, or altering is allowed. Must compare to the stock Briggs part. First camshaft check will be taken at the valve spring retainers. With the lash set at zero, the movement of the valve spring retainer may not exceed .312”. Any camshaft with a measurement at the push rod of less than .306 should be removed and measured on the grind and checked for alteration. Camshaft must be as supplied with Stock Profile and compression relief. Max lift at pushrod is .312”. 

    717.11.1: Install degree wheel, using positive stop method. 

    717.11.2: Check ignition timing. With the right edge of the flywheel magnet (not the magnet holder) aligned with the right edge of the notch on the bottom of the right leg of the coil. The degree wheel must indicate between 23 and 29 degrees BTDC. 

    Coil legs to flywheel O.D. gap is a non tech item. 

    The flywheel key must have the B&S logo. Minimum key width is .182 inch. 

    717.11.3: Tech camshaft at pushrods. Push gently down on the dial indicator stem to ensure that there is no lash when pushrods are going down.

     

    Intake Lobe Profile Specs. 

    .020 - 34 to 30 BTDC 

    .050 – 18 to 14 BTDC 

    .100 – 2 BTDC to 2 ATDC 

    .150 – 13 to 17 ATDC 

    .200 – 29 to 33 ATDC 

    .250 – 49 to 53 ATDC 

    .275 – 63 to 67 ATDC 

    Lift - .303” min - .312” max 

    .275 – 42 to 28 BBDC 

    .250 – 18 to 14 BBDC 

    .200 – 2 to 6 ABDC 

    .150 – 18 to 22 ABDC 

    .100 – 33 to 37 ABDC 

    .050 – 49 to 53 ABDC 

    .020 - 66 to 70 ABDC 

    Exhaust Lobe Profile Specs. 

    .020 - 75 to 71 BBDC 

    .050 – 57 to 53 BBDC 

    .100 – 39 to 35 BBDC 

    .150 – 25 to 21 BBDC 

    .200 – 9 to 5 BBDC 

    .250 – 12 to 16 ABDC 

    .275 – 25 to 29 ABDC 

    Lift - .303” min - .312” max 

    .275 – 70 to 66 BTDC 

    .250 – 57 to 53 BTDC 

    .200 – 37 to 33 BTDC 

    .150 – 21 to 17 BTDC 

    .100 – 6 to 2 BTDC 

    .050 – 11 to 15 ATDC 

    .020 - 29 to 33 ATDC 

     

    717.12: Deck/Piston Clearance: Machining of deck surface is permitted. There will be no knife edge finishes allowed, Smooth finish only. Piston pop up cannot exceed .035” above block surface in the center of the piston. When measuring piston pop up, relieve protrusions left by number stamp on top of piston. Set flat bar stock across piston parallel to wrist pin. Use dial indicator to check pop up on center of this bar. Carbon may be removed from the top of the piston prior to measuring. Top of piston may be filed to relieve protrusions left by number stamp on top of piston. 

    717.13: Bore: Maximum bore 2.725”. Factory oversize pistons allowed. 

    717.14: Stroke: Maximum stroke is 2.206”. Push the piston down to take up rod play. 

    717.15: Head gasket: Any commercially available head gasket may be used but must maintain the same basic configuration of shape of standard Briggs World Formula gasket. Minimum thickness is .038” measured with a micrometer from inside of the cylinder hole of the gasket at 4 points between the head bolts. Fire Ring B&S gasket is legal. 

    717.16: Head: Head may not be altered in any way from factory specifications. EXCEPTION: Oil drain back hole may be enlarged to .375 no go. NO PORTING OF ANY SHAPE OR WAY! Heat sink P\N 555690 is allowed. 

    717.16.05: Cylinder head gasket surface may be machined. Remove Carbon first. Depth from gasket surface to head surface between valves must be a minimum of .319”. Measure by using a depth micrometer. No knife edges or angle milling of head. Cylinder head must be as furnished from Briggs & Stratton. No polishing, grinding, or machining of valve seat angles, or intake and exhaust runners allowed. Valve seats ( Int & exh ) - One 45° angle and a small 30 degree top angle only. Valve seats of additional angles and/or angles not comparable to the factory stock head are not permitted.

    717.16.05.1 Cylinder head- Intake valve guide may be replaced with factory replacement guide , part number 555645 must be installed in stock location, no pushing guide up out of the intake port . A maximum height from top of guide boss measuring .255 max to top portion of guide. Machining of valve guide length is prohibited. Stock length guide to measure 1.250 “ , + or - .005. Exhaust guide replacement legal with part# 555645 factory guide. 

    717.05.2 Cylinder head- no machining of top of head, under the rocker arm plate. Maybe compared to stock known part. This means visual inspection and dimensions may be compared to sample stock head. 

    717.16.1: Rocker Arms / Push Rods: rocker arms must be as produced. Length must be 2.820 inches minimum. Push rod length 5.638" no go to 5.656 must go. Push rod diameter is .185 to .190".

    717.16.5.1: Intake port and manifold: No media blasting of any type allowed on intake port in\on the head or manifold. Must be as cast. 

    Maximum diagonal measurement is 1.101”. 

    Maximum vertical measurement is 1.044”. 

    717.16.5.2: Exhaust port: No media blasting of any type allowed on exhaust port. Must be as factory OEM cast. Maximum I.D. of shoulder in bottom of exhaust port is .854” 

    717.16.6: Valve seats - One 45° angle and a small 30 degree top angle only. Valve seats of additional angles and/or angles not comparable to the factory stock head are not permitted. 717.16.6.1: Intake valve seat diameter is .966” - .972”.

    717.16.6.2: Exhaust valve seat diameter is .844” - .850”. 

    717.16.7: Valves 

    717.16.7.1: Intake valve head diameter is 1.055” - 1.065”. Intake valve length is 3.372” +\- .010”. Intake valve weight - 27.90 grams minimum 

    717.16.7.2: Exhaust valve head diameter is .935” - .945”. Exhaust valve length is 3.372” +\- .010”. Exhaust valve weight - 27.70 grams minimum 

    717.16.7.3: Valve stem diameter is .232” - .238”. 

    717.16.7.4: Valve face must have one 45° sealing surface only. 

    717.17.8 Valve springs 

    717.17.8.1: Dual valve springs as supplied by the factory are required. 

    717.17.8.2: Inner spring wire diameter is .066” - .068”. 

    717.17.8.3: Outer spring wire diameter is .112” - .114”. 

    717.17.8.4: Valve Guides: Replacement of valve guides with B&S factory part 555645, is allowed. 

    717.18: Ignition: Unaltered B&S stock ignition part #555125 or #84012325 with the red shell is mandatory. If using part #84012325, the LED must flash red when the engine is running. Maximum RPM: 7,150. Ignition coil and/or its position, other than air gap may not be altered in any way. Coil attachment bolts must be stock and cannot be altered in any way to advance or retard timing.

    717.18.1: Spark plug connector must be stock factory type. 

    717.18.2: Rubber plug boot is allowed. 

    717.18.3: There must be resistance from plug wire to ground on coil #557040. Resistance must be between 3000 ohms, minimum, to 6000 ohms, maximum. Coil resistance may be rechecked after a minimum of 10 minutes if correct reading is not attained upon first check. No spec available on P\N #557125. 

    717.18.4: Coil air gap is non tech. 

    717.19: Flywheel: Only stock Cast Aluminum Briggs #557126 flywheel is permitted. Starter ring gear and all cooling fins must be in place. No machining, glass beading, sandblasting, painting or coating of flywheel is allowed. Minimum Flywheel Weight with starter ring, cooling fins, and attachment bolts 4 pounds 3 oz. 

    717.19.1: Completely broken off flywheel fan fins are not allowed. Minimum 1.750 inch Flywheel cover opening inch allowed. 

    717.19.2: Stock flywheel key with B & S logo is required and will determine Aluminum flywheel ignition timing. The flywheel key must be aluminum .182 minimum width. NO offset keys permitted.

    717.20: One or two stock crankcase gaskets are required. Silicone with no gasket is not legal.

    717.21: Valve Lifters: Must be stock. No Polishing allowed. 

    717.21.1: Lifter head diameter must be .964” - .984”. 

    717.22: Connecting Rod: Stock B&S part #557005 or 557117 or any commercially available billet aluminum aftermarket rod with or without the bearing insert. Rod may not be altered or modified from factory produced configuration . Rod may be clearanced, providing that it is in stock configuration and finish, with no dimpling or media blasting. Only aluminum material can be used. Rod ends must be concentric with crank journal and wrist pin with no chamfer or breaking of edges.

    717.22.1: Rod length, measured from bottom of wrist pin hole to top of crank journal hole, is 2.419” minimum to 2.429” maximum. 

    717.22.2: Oil hole opening is .185” no-go for the B&S rod. The crank end of the oil hole can be chamfered. 

    717.23: Wrist pin: 

    717.23.1: Maximum I.D. is .414”. 

    717.23.2: O.D. is .624”-626”. 

    717.23.3: Minimum length is 1.901”. 

    717.24: Piston rings: Three rings mandatory. Top compression ring must have chamfer or O toward top of piston. Second scraper ring must be installed with inside chamfer down and O toward top of piston. Oil ring must be installed as from factory. No alteration of rings allowed except end gapping and lapping. Maximum RING GAP of Rings .050. Rings must be self supported in the cylinder bore of the engine being inspected. Rings must remain flat. Rings must be in one piece when removed from block. Aftermarket rings are allowed if they meet the Specifications listed below. 

    717.24.1: Minimum width of top two rings is .095”. 

    717.24.2: Thickness of top two rings is .059” - .064”. 

    717.24.3: Minimum width of oil ring is .065”. Ring groove must be present. Expander must be installed but may be trimmed in overall length.

    717.24.4: Thickness of oil ring is .098” - .102”. 

    717.25: Piston: Stock “kidney bean” piston required. No alteration, polishing or machining allowed. Only piston skirts are coated and coating cannot be removed and skirts or any part of piston be polished. Factory finish only. 

    717.25.1: Minimum from top of piston to top of wrist pin on circlip side is .658”.

    717.25.2: Minimum piston length is 1.768”. 

    717.25.3: Factory oversize World Formula pistons are allowed. 

    717.26: Crankshaft: Stock B&S crankshaft casting #772 and #052 only allowed, all finishes being as factory supplied, with stock timing gear installed in stock location only. No alteration or polishing in any manner allowed. Offset crankshafts not permitted. Stock bearings required. Side cover may be peened to retain side cover bearing. The use of Loctite and or staking to retain crank gear secure to crankshaft is acceptable and legal. 

    717.26.1: Shim(s) if used, must be installed as from factory. 

    717.26.2: Crankshaft journal diameter is 1.094” - 1.100”. 

    717.27: Block: Must be stock with no alterations, except blocks may be repaired to prevent cracking on the flywheel side in the bearing support area. Bracing of engine block behind flywheel is legal. No machining of flywheel allowed . Support can be fastened by epoxy, glue, fasteners .Addition of fasteners is legal. Welding is not legal in this area. Support bracing plate only aluminum , no titanium or magnesium . Sleeving of ignition side bearing bore and repair in block is legal. Means of tightening bearing/bore fit by means of shim, sleeve retaining compound, and coating of outside diameter of bearing only is legal. Slip fitting of crank bearing on ignition side is legal. No after market bearings allowed . Addition of 3rd and/or 4th bearing support for crankshaft is legal. Can be mounted to motor mount or stand alone bolting to to side cover and blower guard housing . Replacement of flywheel nut for use with bearing is legal . Blower gaurd block of plate center hole minimum diameter is 1.750” 

    The oil drain hole between the lifters can be drilled out to any size hole. 

    Venting with a tube going to valve cover or catch can is legal. 

    • Working RaceCeivers mandatory. (Channel: 454.000)

     

    *Division Champion must move up to the next class if they are age appropriate and family and track officials agree!* Must be a Full Season which is 10 plus events!