100cc CONTROLLED:
DRIVER REQ: Age 16 and older. Road Race Class 2 License.
ENGINES: Yamaha, Piston Port, 100cc Controlled, ICA Reed
EXHAUST: Any WKA approved pipe (except 100cc Controlled or ICA Reed with IR1 pipe at a minimum of 9” or IR2 pipe at a minimum of 8.75” from piston to end of connector pipe. See Figure 554.6 for IR1 & IR2 Specs.) All engines – 1.75" header.
FUEL: Gas and oil only.
MINIMUM WEIGHTS: Yamaha and Piston Port engines 360 lbs. Controlled or ICA engines 390 lbs. Controlled or ICA Reed engines running RLV IR1 or IR2 pipe 370 lbs.
OTHER: ICA Reed (See Section 607, 608 and Figures 608.2, 608.3a and b for approved engines and specifications). WKA approved 1 3/4” header and pipe only; head volume 9cc’s and Tillotson HL360A carburetor (See Figure 554.6 for IR1 & IR2 Specs. See Section 607.3 for carb specs.)

UNLIMITED:
DRIVER REQ: Age 18 and older. Road Race Class 1 License.
Engine(s), Weight, Carburetor, Fuel.
One 250 cc gearbox single cylinder, 460 lbs, 39mm carb, gas and oil, See Note 4.
One 450 cc gearbox single cylinder 4-cycle, 460 lbs., 42mm carb, gasoline, See Note 5.
One 125 cc gearbox single cylinder, 420 lbs., any carb, gas and oil.
One 250 cc single cylinder non-gearbox, 460 lbs., any carb, open fuel.
One 150 cc single cylinder 380 lbs., any carb(s), open fuel.
Two 135 cc single cylinder 490 lbs., any carb(s), open fuel.
Two 100 cc single cylinder 465 lbs., any carb(s), open fuel.
Two 135 cc single cylinder fan cooled (West Bend 820 and Mac 101), 420 lbs., any carb(s), open fuel.
Notes:
(1) All engines are 2-cycle except 450 cc gearbox.
(2) Exhaust System: The exhaust system must be a WKA approved design and comply with WKA and local ordinance exhaust noise suppression requirements. Adjustable pipes are legal on all non-gearbox engines.
(3) Technical inspection: Post race technical inspection will include kart weight, engine displacement, fuel, and exhaust system. Other tech items for specific engines are specified below.
(4) 250cc 2-cycle Gearbox Engines:
Allowed single cylinder, mass produced factory motocross engines include Rotax 244, Rotax 257, Kawasaki, Yamaha, Honda, Honda TRX, and Suzuki. Maximum cylinder displacement is 253 cc’s. Engine is to be stock appearing. Interchange of parts between model years is allowed. An aftermarket cylinder head with integrated girdle may be used on the Rotax 257 engines. 250cc two cylinder and GP engines are not allowed.
One single-venturi float bowl or pumper style carb is allowed. Approved slide valve carbs are Keihin, Mikuni, and Dell’Orto 39 mm model carburetors. Carburetor venturi must remain stock. Dell’Orto VHSC carburetor is not allowed. Non-electronic power jets may be added to the carburetor.
OEM ignition is required. Programmable or reprogrammable ignitions are not allowed. Rotax 244 and 257 may use Motoplat, SEM, or PVL non-programmable ignition part #70xxx. Electronic devices to alter ignition timing or carburetor are not allowed. Pneumatic exhaust control power exhaust valve is allowed. Electronically controlled exhaust power valves are not allowed.
Any component, bracket, or accessory (i.e., engine girdle, pipe bracket, ignition, bracket, fuel pump bracket, etc.) may be added as long as it does not directly improve engine performance.
Transmission: Gearbox is not a tech item. Slipper clutch, axle clutch, or Sprag units are allowed.
(5) 450cc 4-cycle Gearbox Engines:
Allowed single cylinder 450 cc motocross engines include Honda, CRF, KTM, or Yamaha. 12.5:1 maximum compression ratio. Carburetor to be 42 mm model as supplied by engine manufacturer. Aftermarket rods made of ferrous material are allowed but must maintain OEM length. Cranks may be balanced, but the stock stroke length must be maintained. Kick starter assembly may be removed and plugged. Add-on oil coolers or dry sump systems are approved. Engines may be updated to current model year. Engines may be modified to allow for the use of external electric starter.
Ignition: OEM Only
Transmission: OEM transmission ratios only. Components may not be machined to reduce weight. Clutch discs, plates, springs, & hardware may be aftermarket. Slipper clutch, axle clutch, or Sprag units are allowed.
OTHER: Additional restrictions may be placed on these engines at any time if it is deemed necessary to maintain parity within the class.
(6) Unlimited races will run for 30 minutes.

B-STOCK:
DRIVER REQ: Age 18 and older. Road Race Class 1 License.
ENGINES: Yamaha; Piston Port; 100cc Controlled.
EXHAUST: Any Fixed WKA approved pipe (No adjustable pipes allowed)
FUEL: Gas and oil only.
MINIMUM WEIGHTS: Yamaha & Piston Port engines 395 lbs.; 100cc Controlled 465 lbs.
OTHER: Karts must be dual-engine with engines of like category.

CONTROLLED LIMITED:
DRIVER REQ: Age 16 and older. Road Race Class 2 License.
ENGINES: Piston Port, 100cc Controlled, 135cc Controlled, Stock Appearing.
MINIMUM WEIGHTS: Piston Port 310 lbs.; Controlled prior 2000 340 lbs.; Controlled 2000 (ICA) and Stock Appearing 390 lbs.; Controlled 2000 engines running IR1 or IR2 pipe and 135cc controlled engines 370 lbs.
EXHAUST: All engines can run a WKA approved slippy pipe. Exception: Controlled engines running IR1 or IR2 pipe at 370 lbs.
FUEL: Gas & oil only. Exception: Piston Port may run legal open fuel
OTHER: COMER MIK351L, CRG S10-T1, DAP T85, ITAL ML21, JAKO 2LA, PARILLA REED JET, PCR TSL95, TSL98 and ROTAX R-100 VM-E engines must use the Tillotson HL360A carburetor. 9cc minimum combustion chamber for Controlled engines.

JUNIOR ENDURO LITE & HEAVY:
DRIVER REQ: Age 12 through 15 only, Road Race Class 3 License.
ENGINE(S): Yamaha only. Only heads with OEM casting “Yamaha” and cylinders with Y3 or Y4 and 787 are legal.
EXHAUST: RLV SSX-V #7548, #7548A, #7540, #7502 for lite weight. Heavy weight may use SBX muffler with 0.875” Restrictor and RLV 26S header with 11” to 12” connector measured from piston to end of connector (RLV exhaust restrictor added to end of connector is not part of 11-12” length.)When a SSX Muffler # 7540 is used, must be run with 4 holes up and part # 7502 must be run 4 holes down. (See Sections 554.2 and 552.3.)
FUEL: Gas and oil only.
MINIMUM WEIGHTS – SSX MUFFLER: 320 lbs. –LITE, 340 lbs. HEAVY
MINIMUM WEIGHTS – SBX MUFFLER: 340 lbs. –LITE, 360 lbs. HEAVY
MAXIMUM KART WEIGHT: 200 lbs. at race end when using SBX Muffler.
If race is red flagged before its proposed time, an allowance of up to 204# per kart weight is acceptable.

PISTON PORT CAN LITE, MEDIUM & HEAVY:
DRIVER REQ: Age 15 and older. Road Race Class 3 License.
ENGINE (S): Yamaha (Only heads with OEM casting “Yamaha” and cylinders with Y3 or Y4 and 787 are legal), ARC Comer & PRD RK 100.
EXHAUST: RLV SSX 7502, 7540, 7541, 7542, 7543, 7544, and SSXV 7548. When a SSX Muffler # 7540 is used, it must be run with 4 holes up and part # 7502 must be run with 4 holes down. When an SSX Muffler # 7541 is used, it must be run with 4 holes pointed in the upper left direction. When an SSX #7543 is used, it must be run with 4 holes pointed in the upper right direction. (See Section 554.2.)
FUEL: Gas and oil only.
MINIMUM WEIGHTS: 360 lbs. LITE, 385 lbs. MEDIUM, 410 lbs. HEAVY
OTHER: Any driver actively participating in a “Road Racing Class 1” level class cannot run in any PP Can laydown class for that season. WKA reserves the right to determine individual eligibility for this class.

100cc PIPE MEDIUM & HEAVY:
DRIVER REQ: Age 16 & older, RR Class 3 license.
ENGINE(S): Yamaha KT100 (only Yamaha heads with OEM casting “Yamaha” are legal), ARC Comer P-50, ARC Comer P-51, PRD-RK-100, Parilla PV-92, Komet K-71 per Section 605, TKM BT81, PRC PP-100, DAP T-50, HPV 100.
EXHAUST: Any fixed WKA approved pipe.
FUEL: Gas and oil ONLY.
MINIMUM WEIGHTS -MEDIUM: Yamaha @ 375 lbs. and Piston Port @ 400 lbs.
MINIMUM WEIGHTS -HEAVY: Yamaha @ 410 lbs. and Piston Port @ 435 lbs.

YAMAHA SPORTSMAN MEDIUM & HEAVY:
DRIVER REQ: Age 16 and older. Road Race Class 3 License.
ENGINE: Yamaha KT100S, Only heads with OEM casting “Yamaha” and cylinders with Y3 or Y4 and 787 are legal.
EXHAUST: RLV SBX muffler and RLV 26S Header with tube protruding through flange intact, 11.0” to 12.0” of flex from piston face to end of flex. (See Section 554.3.)
FUEL: Gas and oil only.
MINIMUM WEIGHTS: 385 lbs. MEDIUM, 410 lbs. HEAVY

100cc CONTROLLED SPEC:
DRIVER REQ: Age 16 and older. Road Race Class 2 License.
ENGINES: Yamaha, Piston Port, 100cc Controlled, ICA Reed.
EXHAUST: 100cc Controlled and ICA Reed engines – Only RLV IR1 at a minimum of 9” or IR2 pipe at a minimum of 8.75” from piston to end of connector pipe (See Figure 554.6 for IR1 & IR2 Specs.) Yamaha and Piston Port engines – any WKA approved fixed pipe. All engines – 1.75" header.
FUEL: Gas and oil only.
MINIMUM WEIGHTS: Yamaha and Piston Port engines 360 lbs. Controlled and ICA Reed engines 410 lbs.
OTHER: ICA Reed engines (See Section 607, 608 and Figures 608.2, 608.3a and b for approved engines and specifications). Head volume 9cc’s, and Tillotson HL360A carburetor (See Section 607.3 for carb specs).

FORMULA 100:
DRIVER REQ: Age 16 and older. Road Race Class 2 License.
ENGINE (S): Open-100cc Open engines, Controlled Limited engines (See Section 312.4)
EXHAUST: Open and 100cc Open - Any WKA approved pipe.
FUEL: Open Class - Open fuel, Controlled Limited - gas & oil only.
MINIMUM WEIGHTS: Open engines 410 lbs., Controlled Limited engines at weights stated in Section 312.4.

FORMULA 125:
DRIVER REQ: Age 18 and older. Road Race Class 1 License.
ENGINES: 125 Gearbox (laydown), B Limited, or Open. (Spec 125 engines run under B-limited rules)
EXHAUST: 125 Gearbox - no adjustable pipes. B Limited and Open - any WKA approved pipe.
FUEL: Open Class and B Limited - open fuel. 125 Gearbox - gas and oil only.
MINIMUM WEIGHTS: B Limited (including Spec 125) 380 lbs., 125 Gearbox 420 lbs., Open 375 lbs.

BRIGGS JUNIOR SPRINT LITE & HEAVY:
DRIVER REQ: Age 12 thru 15 only. Road Race Class 3 License.
ENGINES: Briggs & Stratton Animal 6.5hp w/ 0.360” throttle stop (See Section 700). Silencer mandatory. WKA approved aftermarket billet rods allowed, See Section 706.32.
PIPE: Maximum length 24”. May be one or two piece. Must be inside the rear bumper. Silencer mandatory.
MINIMUM WEIGHTS: 295 lbs. LITE, 315 lbs. HEAVY
FUEL: Methanol
OTHER: (1) Dual brakes required (See Section 355.2.) (2) Dry engine clutch only.

JUNIOR SPRINT LITE & HEAVY:
DRIVER REQ: Age 12 through 15 only, Road Race Class 3 License.
ENGINES: Yamaha (Only heads with OEM casting “Yamaha” and cylinders with Y3 or Y4 and 787 are legal), ARC Comer, and PRD RK100.
EXHAUST: RLV YBX #7500. (See Section 554.1.)
FUEL: Spec Fuel.
MINIMUM WEIGHTS: 295 lbs. LITE, 315 lbs. HEAVY

PISTON PORT CAN SPRINT 360/380:
DRIVER REQ: Age 15 and older. Road Race Class 3 License.
ENGINES: Yamaha (only heads with OEM casting “Yamaha” and cylinders with Y3 or Y4 and 787 are legal), ARC Comer & PRD RK 100.
EXHAUST: RLV SSX 7502, 7540, 7541, 7542, 7543, 7544, and SSXV 7548 mufflers. (See Section 554.3 for legal muffler mounting position.)
FUEL: Spec Fuel.
MINIMUM WEIGHTS: 360 lbs. & 380 lbs.
OTHER: The 360 weight class will run once each race day for two separate championships.

WKA SPRINT 1 & 2:
DRIVER REQ: Age 16 and older. Road Race Class 3 License.
ENGINES: Yamaha KT100S (only Yamaha heads with OEM casting “Yamaha” are legal), ARC Comer, & PRD RK100 and Piston Port.
EXHAUST: Any Fixed WKA approved pipe (No adjustable pipes allowed.)
MINIMUM WEIGHTS: Yamaha, ARC & PRD 360 lbs., Piston Port 380 lbs.
FUEL: Spec Fuel
OTHER: Two separate classes, two separate championships

CIK 125 SHIFTER 1 & 2:
DRIVER REQ: Age 18 and older. Road Race Class 2 Shifter license.
ENGINES: (1) Mass produced, single-cylinder, motorcycle engines of up to 125cc displacement, currently available production, approved by WKA: Honda CR Reed, Kawasaki KX Reed, Suzuki RM Reed, Yamaha YZ Reed, Gilera 125cc and TM Motocross will be allowed. (See Section 613 for specifications.). All engine specs must be unaltered OEM parts unless otherwise specified in this manual. All competitors must be prepared to produce verification documentation of proper dimensions and component data for the engine utilized for competition prior to the time of post tech inspection. (2) ICC engines with homologated pipe and 30 mm carburetor.
EXHAUST: Motorcycle engines - Any fixed WKA approved pipe (No adjustable pipes allowed) with silencer. ICC engines – stock homologated ICC pipe and silencer.
INTAKE SILENCER: ICC requires stock, homologated airbox. Motorcycle requires airbox (See 551.4.2.) and/or air filter. Where specific track or ordinances requires the use of an airbox, this will be noted on entry form. Competitor is responsible to maintain compliance with any rules or ordinances regarding noise regulation.
FUEL: Gas and oil only.
MINIMUM WEIGHT: 390 lbs.
TIRES: Open Compound, 5” or 6” Diameter Rims, Rear Tires 7.00” Min. Width
OTHER: (1) CIK style bodywork only, either conforming to all dimensions listed in Section 200 (except the forward “C” dimension) or CIK approved bodywork that is readily available at least 90 days prior to the beginning of the racing season. Carbon fiber, Kevlar and metal are not legal construction materials for nose, side pods and steering fairing. (2) Radiator must be mounted on the right or left side of the driver between the tires. (3) All karts must use rear bumper rule 359.3.5. (4) Standing start procedure utilized. (5) Rear track width must be a minimum of 50” and a maximum of 55 1/8”. (6) Must use the 125 Sprint Shifter Seat rule described in Section 360.4.4. (7) No butterfly style steering wheels allowed. (8) CIK 125 Shifter 1 runs Saturday, CIK 125 Shifter 2 runs Sunday, two separate championship classes.

WKA 125 SHIFTER 1 & 2:
DRIVER REQ: Age 18 and older. Road Race Class 2 Shifter license.
ENGINES: (1) Mass produced, single-cylinder, motorcycle engines of up to 125cc displacement, currently available production, approved by WKA: Honda CR Reed, Kawasaki KX Reed, Suzuki RM Reed, Yamaha YZ Reed, Gilera 125cc and TM Motocross will be allowed. (See Section 613 for specifications.) All engine specs must be unaltered OEM parts unless otherwise specified in this manual. All competitors must be prepared to produce verification documentation of proper dimensions and component data for the engine utilized for competition prior to the time of post tech inspection. (2) ICC engines with homologated pipe and 30 mm carburetor.
EXHAUST: Motorcycle engines - Any fixed WKA approved pipe (No adjustable pipes allowed) with silencer. ICC engines – stock homologated ICC pipe and silencer.
INTAKE SILENCER: ICC requires stock, homologated airbox. Motorcycle requires airbox (See 551.4.2) and/or air filter. Where specific track or ordinances requires the use of an airbox, this will be noted on entry form. Competitor is responsible to maintain compliance with any rules or ordinances regarding noise regulation.
FUEL: Gas and oil only.
MINIMUM WEIGHTS: CIK bodywork - 410 lbs., WKA bodywork – 430 lbs.
TIRES: Open Compound, 5” or 6” Diameter Rims, Rear Tires 7.00” Min. Width
OTHER: (1) CIK style bodywork allowed, either conforming to all dimensions listed in Section 200 (except the forward “C” dimension) or CIK approved bodywork that is readily available at least 90 days prior to the beginning of the racing season. Carbon fiber, Kevlar and metal are not legal construction materials for nose, side pods and steering fairing. (2) Radiator must be mounted on the right or left side of the driver between the tires. (3) All karts must use rear bumper rule 359.3.5. (4) Standing start procedure utilized. (5) Rear track width must be a minimum of 50” and a maximum of 55 1/8” on karts using CIK style bodywork. (6) Must use the 125 Sprint Shifter Seat rule described in Section 360.4.4. (7) No butterfly style steering wheels allowed. (8) WKA 125 Shifter 1 runs Saturday, WKA 125 Shifter 2 runs Sunday, two separate championship classes. (9) WKA sprint bodywork allowed; bumper and nerf bar rules apply to these karts except that the minimum bodywork width as defined in 358.6.6 shall be 42”. Either CIK style side pods or Sprint Enduro side panels are allowed.

SPEC 125 TAG 1 & 2:
DRIVER REQ: Age 16 and older. Road Race Class 2 TaG License.
ENGINES: BM Jaguar, Easykart 125, Parilla Leopard, Rotax, Sonik VX125
AIRBOX: Must use either (1) an air box originally supplied with any approved TAG engine or (2) any CIK registered air box. (Exception: Rotax Max FR 125 must use the stock air box.)
FUEL: Spec Fuel
MINIMUM WEIGHT: 390 lbs.
TIRES: Open tires, rear tires 7” minimum width.
OTHER: (1) CIK style bodywork only, either conforming to all dimensions listed in Section 200 (except the forward “C” dimension) or CIK approved bodywork that is readily available at least 90 days prior to the beginning of the racing season. Carbon fiber, Kevlar and metal are not legal construction materials for nose, side pods and steering fairing. (2) Radiator must be mounted in the stock location. (3) Belt or chain drives are legal. (4) Dual brake system is required. (5) Kart must meet all 125 Sprint chassis requirements. (6) Standing start procedure utilized. (7) Performance differences between the various manufacturers will be adjusted by kart weight, or restrictions to the engine or exhaust system. WKA will make every effort to make it a level playing field among engine manufacturers. (8) #1 runs Saturday, #2 runs Sunday, two separate championship classes.

BRIGGS ANIMAL SPRINT 335 / 360 / 385:
DRIVER REQ: Age 15 and older. Road Race Class 3 License.
ENGINE: Briggs & Stratton Stock Animal Model 124-432 Type 8001. Silencer mandatory. WKA approved aftermarket billet rods allowed, See Section 706.32.
PIPE: Maximum length 24”. May be one or two piece. Must be inside the rear bumper. Silencer mandatory.
MINIMUM WEIGHTS: 335 lbs. LITE, 360 lbs. MEDIUM, 385 lbs. HEAVY
FUEL: Methanol
OTHER: (1) 215 pound maximum kart weigh in 385 class. (2) Dual brakes required (See Section 355.2l) (3) Dry engine clutch only.

STOCK HONDA 1 & 2:
DRIVER REQ: Age 18 and older. Road Race Class 2 Shifter License.
ENGINE: Honda CR125 RX (A.K.A. 99 CR125 Kit Motor) - Stock OEM 1999 cylinder, head, ignition, etc.
TRANSMISSION: Stock Honda five (5) speed or Honda six speed transmission and clutch assembly.
INTAKE SILENCER: Air cleaner or air box is required. (See Section 551.4.2.) Where specific track or ordinance requires the use of an airbox, this will be noted on entry form. Competitor is responsible to maintain compliance with any rules or ordinances regarding noise regulation.
MINIMUM WEIGHT: 390 lbs.
FUEL: Spec Fuel
TIRES: Open Compound, 5” or 6” Diameter Rims, Rear Tires 7.00” Min. Width
PIPE: Honda RLV 6800 b: RCE T-3 c: Hi-Tech 125.
INTAKE SYSTEM: Stock Keihn PWM or PWK 38mm carburetor.
OTHER: (1) CIK Style bodywork only, either conforming to all dimensions listed in Section 200 or CIK approved bodywork that is readily available at least 90 days prior to the beginning of the racing season. Carbon fiber, Kevlar and metal are not legal construction materials for nose, side pods and steering fairing. (2) Radiator must be mounted on the right or left side of the driver between the tires. (3) All karts must utilize lower bumper cross-bar (See Section 209.3.5.). (4) Standing start procedure utilized. (5) Rear track width must be a minimum of 50” and a maximum of 55 1/8”. (6) Must use WKA/ICC Seat described in Section 360.4.4. OEM water pumps must be retained. Cooling system may use only water and / or water based coolants. Catch containers and / or alternative plumbing is mandatory. Chain guards are required. Addition of a starter nut to crankshaft for external starter allowed.

STOCK LEOPARD SPRINT FINAL 1 & 2:
DRIVER REQ: Age 16 and older. Road Race Class 3 License.
ENGINES: Stock Parilla Leopard
AIRBOX: Stock OEM
FUEL: Spec Fuel
MINIMUM WEIGHT: 390 lbs.
TIRES: Open tires, rear tires 7” minimum width.
OTHER: (1) CIK style bodywork only, either conforming to all dimensions listed in Section 200 (except the forward “C” dimension) or CIK approved bodywork that is readily available at least 90 days prior to the beginning of the racing season. Carbon fiber, Kevlar and metal are not legal construction materials for nose, side pods and steering fairing. (2) Radiator must be mounted to the left of driver between front and rear axles. (3) Belt or chain drives are legal. (4) Dual brake system is required. (5) All karts must use rear bumper rule 359.3.5. (6) Kart must meet all 125 Sprint chassis requirements. (7) Rear track width must be a minimum of 50” and a maximum of 55 1/8”. (8) Must use the 125 Sprint Shifter Seat rule described in Section 360.4.4. (9) No butterfly style steering wheels allowed. (10) Standing start procedure utilized. (11) Stock reeds (11840) and base gasket (BP-25045) must be used. (12) No clean up grinding allowed on cylinders. (13) Races Saturday and Sunday for a single championship.