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Motorhead Events » IWN » Outlaw Jr. Kart Rules
IWN » Jr. Outlaw Kart Rules
  1. Frames must be of kart configuration. Not to exceed 90î in overall length. No EXCEPTIONS. Kart not to exceed 350 lbs. including full tank of gas.
  2. Tires must be kart type only. Not to exceed 6î in diameter.
  3. Cages are mandatory. Must be for protection of driver. Not for looks or wing mounts.
  4. Wing sides must stay within 3î from outer most edge of kart. No sharp edges or too long of bolt. Overall length 48î maximum.
  5. Uppermost part of kart and wing not to exceed 76î.
  6. Bodies can be any material, except wood. No sharp edges or protruding parts.
  7. Wing, hood and tail piece are mandatory in all classes.
  8. No bars, other than regular Nerf bar, may extend out past outer edge of the tire on either side of kart.
  9. NOISE: Must meet state noise levels. Karts in Violation may not race until standards are met.
  10. ALL KARTS MUST DISPLAY 10in NUMBERS OR RIGHT AND LEFT SIDE OF KART AND WING AND INSIDE LARTGE WING PANEL. Numbers that are not legible will not be scored.
  11. Duplicate numbers only in open class. Duplicate numbers must include a letter. Must be a minimum of 6in.
  12. Numbers must be displayed on contrasting backgrounds.
  13. Safety committee and track officials decision is final.
  14. This is open wheel racing, No front-end cowcatchers. If in doubt, see officials.
  15. All drivers under the age of 18 must provide a notarized minor release form to the scorekeepers. A new form is required for each season. In addition, when parent or guardian is not in attendance, drivers must provide us with a designated guardian form. A NEW FORM IS REQUIED FOR EACH RACE.
  16. Should your car enter the infield during a race you must slow down and come to a stop at the edge of the track at that time a yellow flag well come out.
  17. FUEL
    fuel must pass the following test:
  • Visual
  • Continuity meter
  • Gravity test
  • gas, alcohol and water mix
  • Karts will be tested for fuel requirements.

SAFETY

YOU ARE RESPONSIBLE FOR THE SAFETY OF YOU AND KART.

  1. Brakes must be in good working condition at all tomes.
  2. All karts must have seat belts and shoulder harnesses. Shoulder harnesses must be mounted in a way to restrict forward body motion independently of the seat. Lap belts should be mounted on frame. Cut or frayed seat belts will not be allowed. This entire rule will be strongly enforced.
  3. pproved neck braces and arm restraints are mandatory. Arm restraints must be attached to lap belt and worn below the elbow.
  4. HELMETS:
    a. Snell 2000 or SFI 24.1 approved with face shield only.
    b. Must fit drivers head.
  5. Aluminum high back seats are MANDATORY. The top of the seat should be at the middle of the driverís head.
    a.Seat mounts.
    1. Securely mounted to the frame.
    2. No excessive holes.
    3. Any suspended seat is to have safety cable attached to seat.
  6. All drivers should maintain a working fire extinguisher in their pit area.
  7. All karts must have a 6î nylon tie attached to spark plug wire.
  8. Minimum standard for roll cage (tubing thickness):
    a. All classes æ ì .083 chrome molly or 1î .06 chrome molly or 1î.083 steel.
    b. No exotic steel.
  9. Driving apparel: Driving suits required SFI  3-2A/1 min.
  10. No sharp or protruding objects on any part of the kart.
  11. Roll cage must be securely fastened with  grade 5 or better bolt, in at least four spots.
  12. Fuel line location cannot be closer than 2î to any of the exhaust system at any time and shall not be above the exhaust. If closer than 2î, fuel line must be insulated.  Fuel line must have ample slack for cage movement. Must be petroleum grade fuel line.
  13. Fuel tank location: Out board mounted fuel tanks must have metal protection, particularly grade fuel line.
  14. Suicide doors: No suicide bars. Side bar must open from the rear. Left side protection is recommended.
  15. No axle protrusion beyond wheel rim. Max axle length 40î.
  16. Tail piece protection: If the top of the rail section protrudes above the seat, tail must be padded. Suggested padding: plumbing foam. Tail section must be securely attached to the frame.
  17. Smoking in pit area is not recommended. Use common sense.

Black Plate BOX STOCK CLASS
235lbs  .375 hole plate

Blue Plate BOX STOCK CLASS
245lbs  .425 hole plate

BOX STOCK CLASS
275lbs
Age limit:

Rookie Restrictor Box Stock Outlaws :
5 to 8 (Beginner class, <1 year experience.)(.375 Buller restrictor plate)

Restrictor Box Stock Outlaws :
4 to 8 (All exceptions must be approved by promoter.)(.425 restrictor plate)

Box Stock Outlaws :
8 to 13 (All exceptions must be approved by promoter

NOTARIZED MINOR RELEASE IS MANDATORY. A new release for every race season.

  • In addition, when parent or guardian is not present at race event, a DESIGNATED GUARDIAN form is mandatory. One for each race.
  • Minor must be accompanied by an adult at all times while in the pit area. Parent/Guardian is responsible for the actions of their minor child. Bike riding and playing in the pit area is prohibited.
  • Any parent/guardian or pit crew member observed verbally or physically abusing other drivers will result in a fine and/or loss of points for their driver. NO EXCEPTIONS!

STOCK BRIGGS & STRATTON ENGINE RULES:

  • Technical Inspection Procedure
  • Engine No's 130202, 130232, 131232, 132232,133230,133232,135230 & 135232
  • UNLESS OTHERWISE SPECIFIED. ALL PARTS ARE TO BE STOCK AND UNALTERED.
  • PARTS MAY BE TECHED AGAINST A KNOWN STOCK PART. DO NOT ASSUME ANY
  • ITEM IS LEGAL BECAUSE SPECIFIC REFERENCE IS NOT MADE IN THE "TECH
  • MANUAL" ASK YOUR TECH OFFICIAL.
  • Any after market fastener may be used except for rod bolts, head bolts and carb butterfly. Repairing of stripped bolt holes allowed but stock size and location must be retained. Gasket surfaces may be machined, stock angles must be maintained. Excessive removal of material not allowed. Aftermarket gaskets and diagphrams may be used as long as they remain the same dimensions.
  • Engine may be run with or without a air filter. If a filter is used it must be used with a legal adapter. Filter may not act as a ram tube. Sides of filter may not be of less dense material that top. May use two gaskets between carb. and air filter adapter. Silicon or O-ring permitted.
  • Exhaust pipe may not protrude into block. Holes other than for theermocouple not permitted.
  • All shrouds and coil air vane must be used. Flywheel screen must be on flywheel or shroud. Cutting shroud for tire clearance allowed.
  • Recoil may or may not be used. Stock ratchet, starter cup or after market starter nut allowed. Ratchet end of crank may be removed.
  • Briggs magnetron ignition only. Coil 2,000 ohms minimum, 5,000 ohms maximum. Any plug connector allowed but must be included in ohms check. Silicone may be used on low tension wires.
  • Tank may have one or two gaskets installed. Clearancing for tire, repairing and bracing allowed. Splash Shield, may be used.
  • CARB Flange may use one or two gaskets. With the .696 No-Go in the back side of the carb, it cannot hit the butterfly when open. No sealers anywhere other than end plug, pickup tube and as sealer between air filter adapter and carb.
  • Swirl may be removed.
  • Bore .695" maximum inside dimension includes the entire length of the carburetor bore. Metering hole protrusions not permitted. Counterbore .726" no-go only.
  • Throttle shaft .086" minimum at back, .040" at front. Stock butterfly screw mandatory. Minimum length of screw is .322". New Torx screw may be used. No modification to butterfly. Where butterfly mates with throttle shaft, it shall have a minimum dimension of .058" and of .101" at back of ramp thickest point. Felt or foam washer must be on carb shaft under lever.
  • Choke may be removed and holes plugged. Plugging material may not enter carb bore. If choke is installed it must be stock. New style carbs from factory have no choke holes.
  • Jet may have remote tuner. Jet must be installed as from factory. Hole size in jet non-tech. No recessing of hole permitted from back side. No funneling or oblonging of hole permitted.
  • Idle hole .028" no-go. High speed hole .062" no-go. Straight round holes only. No tapered or oblong holes allowed.
  • Pickup tube screen optional and non-tech. I.D. .066" no-go for short tube steel winding. No-Go cannot pass completely through tube when checked from either end.
  • Maxximum air horn inlet 1.011". No machining allowed.
  • Aftermarket device to repair broken ear on carb permitted.
  • Aftermarket head gaskets of same size and material permitted. Minimum thickness .043" checked halfway between holes. No sealers or coatings.
  • Head must check .011", .408", .300" minimum; .315 maximum. Soft carbon may be wiped with rag before checking. Hard carbon may not be removed. Only headbolt mating surface and gasket surface may be machined. Glass beading or sanding for carbon removal only. Head bolt holes .348" no-go.
  • Maximum piston pop out at wrist pin centerline .015". Deck must remain above valve seat.
  • Maximum bore 2.607". Inspect deck for reworking of eyebrow area.
  • Stroke 2.4270" to 2.4470"
  • 30 degree, one angle intake valve, minimum diameter 1.115". 45 degree, one angle exhaust valve, minimum diameter .990". Minimum edge margin .025". IC block must run cool bore exhaust valve, spring and retainer.
  • May use Intake or Exhaust spring on intake valve. Must use Exhaust spring on exhaust. Maximum length 1.500". Maximum wire diameter .092. Minimum inside diameter .625".
  • 30 degree, on angle, valve seat diameter no-go. 1.005" intake. 45 degree, one angle, .880" exhaust. Inlet port .880" no-go. Exhaust outlet 1.005" no-go. No-go check to be made at intake port inlet and exhaust port outlet. Port area surface and finish are non-tech, but there can be no addition of any material. Valve seat inserts must remain unaltered.
  • Any upper spring retainer allowed. .058" maximum thick-ness. Upper part of valve spring chamber may be machined to prevent coil bind.
  • Stacking of stock valve guides and one-piece guided allowed, installed as factory intended.
  • Flywheel may not be altered in any way. No broken fins or painting allowed. Minimum flywheel weight 5lbs. 12oz.

CAM PROFILE

Zero degree wheel with position piston stop.

Exhaust Intake


.050----------(38-33 BBDC) .050------------(7 DTDC - 0 TDC)

.100---------- (21 - 16 BBDC) .100--------------- (10 - 7 ATDC)

.150---(2 BBDC - 3 ABDC) .150---------------(29 - 36 ATDC)

.200 ----------(21 - 31ABDC) .200 --------------(55 - 64 ATDC)

Max.------------------- (.233") max.------------------------ (.233")

.200-----------(76 - 65 BTDC) .200---------------(43 - 33 BBDC)

.150 ---------(48 - 40 BTDC) .150-------------- (13 - 6 ABDC)

.100 ----------(28 - 21 BTDC) .100 -------------- (6 - 13 ABDC)

.050------------ (10 - 4 BTDC) .050 ---------------(23 - 31 ABDC)

E-Z Start------ (45 - 60 ABDC) E-Z Lift---------(.013" minimum)

E-Z Lift----- (.019" maximum) E-Z Duration (30 degree minimum at .001" drop

Note: All cam profile readings must be taken with zero valve lash. When checking cam profile, rotate engine in the direction it runs only. (Valves should have no clearance and no spring tension when checked.)

  • Multiple side plate gaskets allowed. Center punching of gasket surface allowed.
  • Cam has no visual check on the lifter surface. Cam block boss O.D. and finish are non-tech.
  • Lifters O.D. .982" minimum, 1.005: maximum. 1.606" maximum overall length. Champhering at bottom of lifter bore for clearance purposes only. Max I.D. of chamber is .500. (the intent of this is not to back face lifter bore area.) Billet lifters permitted. Check to stock dimensions.
  • Rod bolt lock, washers and dipper are non-tech and optional. Stock rod bolts must be used. The dipper area only of the Raptor II 55207 rod is non-tech. Oil hole size Non-tech. No .020" undersize rods dimensions.
  • Any unmodified, series produced aluminum alloy rod that is available to the karting industry is allowed. Rods other that the Briggs factory rod may be no lighter than 135 grams with bolts and inserts, if used. Rod length, from bottom of wrist pin hole to top of crank hole must measure between 3.120" and 3.143".
  • Wrist pin. Maximum I.D. .290: Maximum O.D. .490" Raptor III wrist pin I.D. .281 Max., O.D. .490, Length 1.731 +/- .005.
  • Piston. Minimum length 1.869" Minimum top of wrist pin to top of piston. .937". IC engines may run IC or cool bore piston. Raptor III piston allowed, arrow facing coil or PTO. Piston length 1.672 + or - .005. Top of piston hole to top of piston .937 + or - .005. Raptor III ring .090 min. width, . 058 + or - .005 thickness.
  • Raptor III oil ring .070 min. width, .100 + or - .005 thickness.
  • Stock type cool bore rings only. No IC rings allowed. Machining back side of rings allowed. Top groove - compression ring installed. Minimum width: .095". (No chrome ring or expander under ring.) May or may mot have bevel.

Middle groove - oil scraper ring installed with outside scraper groove down. Minimum width .095". (No expander under ring.)
Bottom groove - one piece oil ring installed either way, and no three piece or four piece oil ring from chrome set allowed. Minimum width .085".
Heat treating of stock crankshafts legal. Bushing type PTO journal crankshaft may be turned down to allow the use of bearing. Cam gear must be in place on an unaltered key.)

  • Stock Briggs bushing #399268 or #297565 may be installed on flywheel side. Inspect block for alterations and reworking. Blocks welded for broken rods are legal if not used to disguise modifications. Minor welding to lower exhaust bolt hole is allowed for repair (weld cannot protrude into exhaust port). Reinforcement or repair of lifter boss area is allowed. Installation of bushing guide to help reinforce lifter bore area allowed. Removal of governor mandatory. PEER 6205-14 or equivalent 9 ball, steel separator, ball bearing allowed on flywheel side of ball bearing cranks. This bearing is used without sleeve. Extra .125" hole may be added on flywheel side of block for better bearing lubrication. After-market PTO bearing of non self-aligning type, with or without shields, is permitted. No ceramic bearings allowed.
  • Check valve seat heights 5.485: minimum/ 5.520" maximum. Install a .500: rod in place of cam and replace side cover. Measure though the valve guide from top edge intake or exhaust valve seat. Lifter bore and valve guide bore must accept seat height gauge rod
  • Header or Muffler
  • Header or muffler must extend beyon fuel tank, but not to extend past rear bumber. Minimum 1.990" washer or flange mandatory on pipe end. No sharp edges. Washer thickness. 075" minimum.
  • Exhaust header end or muffler may not protrude inside of port.
  • Header support allowed. Bracket to support header or muffler allowed. Bracket may not be secured under more that 4 head bolts.
  • Must be fixed position pipe. No "slippy" pipe.
  • No extra tubes to, in or through header allowed.
  • Hole for exhaust thermocouple allowed. Thermocouple must be in place.
  • Loop pipe must be heat wrapped for safety.
  • Header and Mufflers will be required on all 4-cycle engines. RLV B-91 on all stock motors. Block savers/ exhaust rotator allowed.
  • Bolt or studs securing header must be safety wired. Muffler must be safety wired through a hole in the header brace and perforations on end of the muffler. Do not weld on or drill holes in the muffler.
 

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Motorhead Events 2010 - 2011 Event Schedule

Demolition Derby &
Figure 8 Races
December 3rd & 4th
Columbia, Missouri
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The Indoor Winter Nationals
December 5th 2010
Columbia, MO
More»

American Arenacross
Dec 10th & 11th 2010
Columbia, MO
More»

Columbia TT Challenge
CANCELLED!

American Arenacross
Jan 7th & 8th  2011
Springfield, MO
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Demolition Derby &
Figure 8 Races
Jan 15th 2011
Lebanon, MO
More»

The Indoor Winter Nationals
Feb 4th & 5th 2011
Springfield, MO
More»

The Springfield Enduro X
Feb 18th &19th 2011
Springfield, MO
More»

The Indoor Winter Nationals
March 5th 2011
Lebanon, MO
More»

Demolition Derby &
Figure 8 Races
March 18th &19th 2011
Springfield, MO
More»

Contact Us

Motorhead Events LLC
2543 E. Chinkapin Ln
Springfield, MO 65804

jay@motorheadevents.com
417-863-6353