ARTICLE VI CLASSES

ARTICLE VI CLASSES

Section 1: A driver’s actual age as of January 1st will establish their karting class during the calendar year. Any driver who may attain the age of a higher class during a season can at their discretion remain in the lower class for the remainder of the season or move up to the higher class. All points earned in the lower class will be lost. A birth certificate may be required. Proof of age will be required for drivers who are Club members for any class where age is a factor. For junior classes, where the driver is a visitor, in the absence of proof of age, the parent or guardian shall sign a waiver stating the age and birth date of the junior driver.

Section 2: There will be a 1 kart minimum set as the number of karts required to be signed in and take the green flag at the start of the feature event for the event to be classified an official points event. A season championship requires at least 3 karts racing in a minimum of 50% of all race events.

Finishes will be awarded as follows:

All Senior classes shall receive 1st, 2nd or 3rd place trophies/medals (or members may receive a plaque if designated on their initial membership application that year). In addition, members who receive plaques and win their first feature race may receive a trophy/medal along with their plaque plate.

All participants in Kid Kart, Kid Kart Champ and Rookie will receive a trophy/medal.

All Junior classes will receive a trophy/medal up to 5th place, or a plaque as previously stated above. If plaques are chosen they will be awarded for any place finish in each class.

Section 2a: The Kid Kart, Kid Kart Champ and Rookie classes will have a maximum of 10 karts per class. All other junior classes will have a maximum of 12 karts. All senior classes will have a maximum of 14 karts. All classes with karts over the maximum allowed will be split.

Section 2b: All trophies/medals will be issued on race day only. If a winner is unable to pick up their award at the end of the day, arrangements must be made to have someone else pick it up.

Section 2c: Classes must complete at least 2/3rds of the points races completed, in order to receive year end trophies and Champion status.

Section 2d: Allow class racers to freeze their points and move up when they reach the required age for the next class. Jr1 to Jr 2, etc -.

SECTION 3: Class Structures

Flathead motors are legal to run in all animal classes however they will receive no concessions. Flathead motor rules will revert to the 2006 tech manual for JR Stock and the 2007 tech manual for JR1 and JR 2. All other classes will refer to the most current WKA tech manual.

KID KART (Exhibition Only) Age 5 – 8 Comer P50/51 140 lbs. All WKA 413.14 Kid Kart Rules Apply. Local Option JR 206 Engine also legal.

KID KART CHAMP (Exhibition Only) Age 5 – 7 Subaru Robin EX13 Overhead Cam 4.5 HP Engine 260lbs, 15×65 Gear Rule, 4000 max RPM. All WKA 413.15 Kid Kart Champ Rules Apply.

ROOKIE (Exhibition Only) Age 7 – 9 Subaru Robin EX13 Overhead Cam 4.5 HP Engine 240lbs, 4000 max RPM.

BRIGGS SPTS 1 Age 8 – 10 Briggs & Stratton Stock Animal Engine with a restrictor plate three holes 0.225” (purple), Flathead .425” (purple), Clone .500 (purple) 250lbs

BRIGGS SPTS 2 Ages 10 – 12 Briggs & Stratton Stock Animal Engine with a restrictor plate top hole 0.275″ and a bottom hole of 0.325″ (turquoise/blue), Flathead .500” (turquoise/blue), Clone .550 (turquoise/blue) 275lbs

BRIGGS JR Age 12 – 15 Briggs & Stratton Stock Animal with a 0.505″ (gold) restrictor plate, Clone unrestricted, 300 lbs.

BRIGGS SPTS CHAMP Age 8 – 12 Briggs & Stratton stock Animal engine with a restrictor plate top hole 0.275” and a bottom hole of 0.325” (turquoise/blue), Flathead .500 (turquoise/blue), Clone .550 (turquoise/blue), 315 lbs.

BRIGGS JR CHAMP Age 12 – 15 Briggs & Stratton Stock Animal Engine with a .575 (Black) restrictor plate 335 lbs.

BRIGGS MASTERS Age 35 and older Briggs & Stratton Stock Animal Engine Methanol, Flathead Unrestricted, 375 lbs.

BRIGGS LITE, MEDIUM, & HEAVY Age 15 and older Briggs & Stratton Stock Animal Engine or Flathead Unrestricted Engine 325 lbs. LITE, 350 lbs. MEDIUM 375 lbs. HEAVY

BRIGGS SUPER HEAVY Age 15 and older Briggs & Stratton Stock Animal Engine or Flathead Engine, Overall minimum weight is 400 lbs., Maximum kart weight is 200lbs.

BRIGGS RAPTOR Age 15 and older Briggs & Stratton Stock 5HP Engine 360 lbs

2 CYCLE/UNLIMITED 105cc/120cc/140cc/160cc Age 15 and older, No turbo chargers, super-chargers, or nitrous oxide.

105cc – 300lbs
120cc – 340lbs
140cc – 380lbs
160cc – 420lbs
Wedge Bodies are allowed.

BOX STOCK (Clone) Age 15 years and older – 375 lbs- 87 Octane Gas Only – Approved Engine: BS Project 6.5 OHV Clone, Stamped steel drum shoe type clutches only, 12 tooth only, Rear Gears 63,64 or 65. No Tachometers allowed. C

POWDER PUFF Age 15 years & up – 375 lbs. – 87 Octane Gas Only – Approved engine: BS Project

ROARING LIONS Age 14 years and older – 400 lbs. – 87 Octane Gas Only – Approved Engine: BS Project 6.5 OHV Clone, Stamped steel drum shoe type clutches only, 12 tooth only, Rear Gears 64,65 or 66. No Tachometers allowed.

JR INTERNATIONAL STOCK CLASS STRUCTURE

BOX STOCK JUNIOR 1 Age 8 to 10 years – 265 lbs. – 87 Octane Gas Only – Approved engine: BS Project 6.5
OHV CLONE, with .500 inch maximum intake restrictor, Stamped steel drum shoe type clutches only. No Tachometers allowed

BOX STOCK JUNIOR 2 Age 10 to 12 years – 290 lbs. – 87 Octane Gas Only – Approved engine: BS Project
6.5 OHV CLONE with .550 inch maximum intake restrictor, Stamped steel drum shoe type clutches
only. No Tachometers allowed

BOX STOCK JUNIOR 3 Age 12 to 15 years –320 lbs. – 87 Octane Gas Only – Approved engine: BS Project
6.5 OHV CLONE, Stamped steel drum shoe type clutches only. No Tachometers allowed

***Important Note***

All parts must be Box Stock Project factory production parts unless otherwise specified in this rules manual. No machining or alteration of parts is allowed unless specifically noted. All parts will be subject to a comparison to a know Box Stock part (when performing a comparison check it is recommended to use a + /- .005” tolerance). Engine will be teched as raced. There will also be a $200 claiming rule in place for this engine. Refusing to accept the claimer will result in immediate disqualification of competitor along with forfeiture of any points earned to date in class. Competitor will also not be allowed to compete any longer in that class. In addition if at any time it is determined that anything has been done to circumvent the spirit and intent of this as an entry level class. Whether it is an engine performance modification, fuel or oil enhancements, data recording devices, etc… You and anyone racing with your membership/family/team will be suspended from the blue motor class permanently.

All Clone Classes must conform to 2010 WKA Kart Specifications.

BOX STOCK CLONES

710 BOX STOCK CLASS ENGINES

These rules describe the specifications for International Class engines. All parts must be factory production parts unless otherwise specified in this manual. No machining or alteration of parts is permitted unless specifically noted. All parts are subject to be compared to known stock parts. No reading between the lines. If it not in the rules, it must remain, stock. UNLESS OTHERWISE STATED ENGINE WILL BE TECHED AS RACED. Additional rules may be added as WKA moves forward with this program.

FUEL TANK: Must be floor mounted.

DESCRIPTION: Single cylinder, 2 valve, OHV 4 cycle, All colors are legal
Important Note: All parts must be Box Stock factory production parts unless otherwise specified in this rules manual. No machining or alteration of parts is allowed unless specifically noted. All parts will be subject to a comparison to a known Box Stock part (when performing a “stock part” comparison check it is recommended to use a + /- .005” tolerance). Engine will be teched as raced. There will also be a $200 claiming rule in place for this engine. Refusing to accept the claimer will result in immediate disqualification of competitor along with forfeiture of any points earned to date in class. Competitor will also not be allowed to compete any longer in that class. No aftermarket coatings of any type are permitted on any part of the engine(exception Blower Housing and Shrouds).

CARBURETOR: Huayi OR RUI*ING model carb only. Carb to intake sealer is gasket only no other sealer allowed. Choke must be as supplied from factory, but may be fixed to stay in open position. Venturi .615” NO-GO. Rear carb bore .751” NO-GO. Main fuel jet .042” NO-GO. Low speed idle jet .019” NO-GO. Stock emulsion tube must be used and unaltered, .066″ max ID (no pass through). Throttle shaft – .115” minimum. Butterfly – .037” minimum. Aftermarket air filter adapter allowed (max length of 1.375).

FUEL PUMP: Any pulsed type fuel pump is allowed. Fuel pump must be pulsed from the valve cover. *Any other way to pulse must be approved by the WKA Tech Official for the race weekend.

AIR FILTER: Any air filter allowed. After market air filter adapters are allowed. Maximum length: 1.375”.

BLOCK: Block must remain stock as produced. Stub for governor may be removed and hole plugged. No machining of block allowed. Welding to the block shall be for rod damage repair only and may not constitute a functional modification. Stock cylinder bore is 2.685″ max. Stock cylinder bore is 2.685″ max. Stroke is 2.123″ + .010″ or – .005″. No piston pop-out allowed. Matting surface finish of block and cylinder head is a non tech item, sufacing of both to correct gasket failure and meet cc check allowed. May use 2 side cover gaskets of stock configuration.

COMBUSTION CHAMBER VOLUME: 26.5 cubic centimeter minimum, with piston at TDC, using prescribed procedure.

CYLINDER HEAD:
Must be OEM casting only. Porting and / or grinding are not permitted. Valve seats are two angles 45 degrees valve face and 30 degrees top relief. Intake seat maximum ID .897” , Exhaust seat maximum ID .862”. Stock head bolts only, must have four. Head gasket/s maybe after market, must be of stock configuration, 2 gaskets permitted with a total minimum thickness of .008” and maximum of .020”. No copper or aluminum gaskets allowed. Any stock configuration exhaust gasket allowed no other sealer.

VALVE TRAIN: Stock valve cover only with any stock configuration gasket, no sealer. Factory stock rocker arms 1:1 ratio and push rods only. Stock valves only 45 degree angle only both valves, Intake valve Max OD .985” +/- .005” and Exhaust valve Max OD .948” +/- .005”, no modifications allowed. Only Box Stock valve springs. Max wire diameter on spring wire is .071” with a maximum tension of 10.8 lbs. at a height of .850”. Lash cap on exhaust valve only, maximum lip thickness of .027”.Minimum thickness of Intake retainer .230” , Exhaust retainer .250”. BS lifters only, no modifications allowed.

ROD: Stock Box Stock rod only. No machining of any type allowed. Stock rod bolts only.

CRANKSHAFT: Stock Box Stock crankshaft required. Machining, polishing, addition of material or other alteration of crankshaft is prohibited. Stock factory timing gear mandatory and must be installed in original location. Crankshaft journal diameter is 1.180”max – 1.168” min.

PISTON AND RINGS: Must be unaltered Box Stock only. No machining of piston and rings allowed.

CAMSHAFT: Stock camshaft cores only, ez-spin assy must remain as stock. Cam lobe base circle diameter .865″ -.005”/+.010” Duration check for Intake and Exhaust lobes (taken off pushrod). Intake duration of 219 degrees at .050 lift/86 degrees at .200 lift. Exhaust duration of 222 degrees at .050” lift/97 degrees at .200” lift(All duration checks on intake and exhaust allow +/- 2 degrees for wear and gauge variances). Max Intake lift on cam .225” – Min .215”lift taken at the pushrod. Max Intake lift at the valve .238” Taken on valve spring retainer with zero lash. Max Exhaust lift on cam .232” – Min .222” lift taken at the pushrod. Max Exhaust Lift at the valve .242” Taken on valve spring retainer with zero lash. (All duration checks on intake and exhaust allow +/- 2 degrees for wear and gauge variances)

IGNITION SYSTEM: Stock Box Stock system only and must be unaltered. Kill switch and low oil sensor may be disabled and removed. Flywheel: Box Stock flywheel only(5lbs 4 oz minimum) including plastic fins. No alterations of any type allowed. Maximum ignition timing advance is 18° BTDC when a straight edge placed on the outside of the right-hand coil leg is just touching the right-hand edge of the metal magnet cover of the flywheel. Flywheel key is non-tech.

BLOWER HOUSING ASSEMBLY: pull starter must be present and remain stock. Pull starter may be rotated for a better crank angle.

HEADER PIPE AND SILENCER: Header Pipe Length: Minimum 10”- Maximum 18”. Silencer must be a RLV 91_L type with .1285 no-go hole. (No aftermarket coatings of any type are permitted.)

OR

Any single stage, one piece header made from .750” OD max and .635” ID max. steel tubing allowed, with the RLV Mini B-91 Silencer (Optional 12-1-2010 and mandantory 3-1-2011) installed at the end of pipe. The B-91 Silencer must be tread fitted to the pipe end. The entire exhaust pipe including the muffler is 15” max length and 10” min length. RLV Mini 91 Silencer Requirements: Part # 4117 Overall Length 5.465” minimum – 5.605” maximum. Threaded Nipple .690” maximum ID. Internal raised weld seam must be present. (ID as Mfg. NO Grinding, Reaming, or Polishing Allowed) . Rear baffle holes .1285” maximum, inner baffle holes .0965” maximum. Silencer must be utilized as produced, with no modifications or alterations permitted. Strap or brace required to silencer for support, and to insure silencer does not turn and unscrew. (No aftermarket coatings of any type are permitted.)

Mandatory for both rules header must be wrapped a minimum of 8” starting from where it attaches to the head.

FLYWHEEL AND IGNITION: Flywheel and ignition coil must be stock. NO alterations, NO machining. Timing must be stock with stock flywheel key. Plastic fins must remain stock.

STARTER: Pull starter must be present and remain stock. Pull starter may be rotated for a better cranking angle.

OIL CATCH CAN: Engine oil recovery system mandatory.

OIL SENSOR: Oil sensor may be removed.

GOVERNOR: Governor and governor components are non-tech.

Claimer Rule (UPDATED 4/12/11): Applies to ALL CLONE engines in ALL CLASSES with clone
engines running in them. The clone engine claim is open to all racers in the class regardless of what engine type they are running. The only exception to this rule would be the unlimited class (No claims allowed in the unlimited class).You must finish the race in order to purchase the winners CLONE engine for $200 (Cash Only) (minus the clutch, clutch/chain guard, throttle kit, header pipe, muffler, air filter adapter, air filter, top plate & fuel pump, restrictor plate (if part of the class)). The following tech will take place on all claims. Full carb, springs, shroud removal, flywheel, timing key, timing, roll cam for duration and lift, side cover removed for visual rod check.