WKA DUNLOP/XERAMIC NATIONAL ROAD RACING SERIES PRESENTED BY RUSSELL KARTING 

 

NEXT UP:

ROAD RACE CHAMPIONSHIPS AT KARTWEEK
Daytona International Speedway | Daytona Beach, FL

December 27-30, 2016

The Official WKA hotel is the Best Western Plus International Speedway Hotel and our contact there is Lisa Nixon (386) 258-6333.  To make reservations at the Ocean Breeze Club, click the link below and enter the Group Code "World Karting Association" or call direct: 386.239.9800 or toll free 855.212.3224


2017 SCHEDULE

Roebling Road Raceway | Bloomingdale, GA
March 10-12, 2017

Summit Point Raceway | Summit Point, WV
June 3-4, 2017

Virginia International Raceway | Alton, VA
July 21-23, 2016

Grand National
Atlanta Motorsports Park | Dawsonville, GA

September 15-17, 2017


Would you like to reserve your kart number for 2017?

 
 

FINAL 2016 Point Standings

Click below for the following classes: 

TAG HEAVY, UNLIMITED, WKA SPRINT, YAMAHA SPORTSMAN SPRINT, YAMAHA SPRINT, YAMAHA MEDIUM

Click below for the following classes: 

FORUMLA 100, FORMULA 125, 125 SPRINT SHIFTER, STOCK HONDA, LEOPARD SPRINT

Click below for the following classes: 

YAMAHA HEAVY, YAMAHA HEAVY, YAMAHA SPORTSMAN MEDIUM, YAMAHA SPORTSMAN HEAVY

Click below for the following classes: 

ANIMAL MEDIUM, ANIMAL HEAVY, CLONE-LO206 LITE, CLONE-LO206 HEAVY, JR SPRINT, JR ENDURO

 

Click below for the following classes: 

B STOCK, 100CC PISTON PORT, 100CC CONTROLLED, ANIMAL LITE

 

CURRENT CHASSIS POINT STANDINGS


CLASS STRUCTURE

SPRINT CLASSES

*All Classes Noted as Final One + Final Two run both days for a single year end Championship

All Ages are Attained Age

 

362.1 CADET SPORTSMAN LO206 (FINAL 1 & FINAL 2)

(NON-NATIONAL- - LOCAL OPTION CLASS)

DRIVER REQ: Age 8 thru 12
ENGINE: Briggs and Stratton LO206 engine with Green slide and lock cap
FUEL: Gasoline
MINIMUM WEIGHT: 225 lbs
BODYWORK: Steering Fairing allowed, but may not extend above steering wheel parallel to racing surface.
CHASSIS: Cadet Chassis allowed
CLUTCH: Any rim centrifugal clutch with a max of 9 springs and 6 shoes. No alteration of clutch allowed, except springs. Clutch coolers not allowed.
PIPE: Pipe must be inside the rear bumper . LO206 header must be RLV Model 5506 or 5507. EGT and O2 sensor may not be installed in the header pipe.   
MUFFLER: Muffler must be a RLV B with 0.1285 No-go holes, also see 708.2.1.1 .
OTHER: Class runs 15 minute races after lunch break each day.   No other karts on track during this time.   Dual brakes not required. No radio communications may be used.

362.2 JUNIOR LO206 (N) (FINAL 1 + FINAL 2)

(NON-NATIONAL -- LOCAL OPTION CLASS)

DRIVER REQ: Age 13 thru 15 only opening and locking cap (#555726)
HEADER PIPE: Pipe must be inside the rear bumper. LO206 header must be RLV model 5506 or 5507. EGT and O2 sensor may not be installed in the header pipe. Also see 708.2.1.1.
MUFFLER:  Must be a RLV B with 0.1285 no-go holes.
MINIMUM WEIGHT: 250 lbs.
FUEL:  Gasoline.
CHASSIS:  Cadet chassis allowed.
BODYWORK:  Per 358.6 359 and 360. Exceptions--steering fairing allowed but may not extend above steering wheel parallel to racing surface. No radio communications may be used. 
CLUTCH:  Any rim centrifugal clutch with a maximum of 9 springs and 6 shoes. No alteration to clutch allowed, except springs. Clutch coolers are not allowed.
OTHER: (1) Class race runs after lunch break each day.   (2) Dual brakes not required.

362.3 JUNIOR ANIMAL (FINAL 1 + FINAL 2)

DRIVER REQ: Age 12 thru 15 only.  Road Race Class 3 License.
ENGINES: Briggs & Stratton Pro Gas Animal with Black restrictor plate. Gold Cup Pro Gas engine rules apply -OR- Briggs & Stratton Stock Animal with 0.575” black restrictor plate.  (See Section 700).  WKA approved aftermarket billet rods allowed. See Section 704.33. Briggs #555690 - Heat Disperser allowed.
PIPE: Pro Gas Animal rules apply to Pro Gas engine. Stock Animal maximum length 24”. May be one or two piece. Must be inside the rear bumper. Silencer mandatory.
MINIMUM WEIGHT: Animal-305 lbs --- Pro Gas 315 lbs.
FUEL:  Pro Gas: Gasoline. Stock Animal: Methanol
OTHER: (1) Dual brakes required (See Section 355.2)     (2) Dry engine clutch only.

362.5 ANIMAL 385 (FINAL 1 & FINAL 2)

DRIVER REQ: Age 15 and older. Road Race Class 3 License.
ENGINE: Briggs & Stratton Stock Animal Model 124-432 Type 8001. Briggs #555690 - Heat Disperser allowed.
PIPE: Maximum length 24”. May be one or two piece. Must be inside the rear bumper. Silencer mandatory.
MINIMUM WEIGHTS: 385 lbs.
FUEL: Methanol
OTHER: (1) Dual brakes required (See Section 355.2)    (2) Dry engine clutch only   (3) Class runs both days for single points championship.

362.8 CLONE / LO206 385 (FINAL 1 & FINAL 2)

DRIVER REQ: Age 15 and older. Road Race Class 3 License.
ENGINE: Clone (See Section 711 and 713 for engine rules) OR
Briggs & Stratton LO206 (see Section 708 for engine rules).
HEADER PIPE AND SILENCER: Header Pipe Length: Minimum 18”- Maximum 22”. Pipe must be inside the rear bumper -- LO206 must be RLV header 5506 or 5507, also see section 708.2.1.1
MUFFLER: Muffler must be a RLV 91_L type with 0.1285 no-go holes.
MINIMUM WEIGHT: 385 lbs. (same weight for each engine)
FUEL: Gasoline (Clone and LO206)
OTHER: (1) Dual brakes required (See Section 355.2)     (2) Dry clutch only     

362.9 JUNIOR SPRINT (FINAL 1 & FINAL 2)

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 WEIGHT: 315 lbs
OTHER: Dual braking system required

362.10 TAG JUNIOR (FINAL 1 & FINAL 2)

(NON-NATIONAL -- LOCAL OPTION CLASS)

DRIVER REQ: Age 13 through 16.
ENGINES: Parilla Leopard or IAME X-30.   See section 609 for engine specs.
MINIMUM WEIGHT: 320 lbs
FUEL: Spec Fuel.
EXHAUST PIPE / SILENCER: Must be stock pipe and restricted factory header as supplied for each specific engine model.
Parilla Leopard =  28 mm  --  IAME X-30 = 29 mm. See section 609 for other exhaust particulars -- Both engines run at 18.5” min length. See 609.1 for measuring instructions.
CARBURETOR: Must be stock as factory supplied for each specific engine.
AIRBOX:  Required per section 551.
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 not required. Rear disc minimum diameter - 7” --- minimum width - 3/16”  (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..

362.11 YAMAHA SPORTSMAN SPRINT (FINAL 1 & FINAL 2)

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).
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 554.2 and Figure 554.2)
FUEL: Spec Fuel.
MINIMUM WEIGHT: 360 lbs.
Dual braking system required.
OTHER: Class runs both race days for a single points championship

362.12 YAMAHA SPRINT (FINAL 1 & FINAL 2)

DRIVER REQ: Age 15 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: Any WKA approved fixed pipe.
MINIMUM WEIGHT: 360 lbs.
FUEL: Spec Fuel.
Dual braking system required.
OTHER: Class runs both race days for a single points championship.

362.13 WKA SPRINT (FINAL 1 & FINAL 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., and Comer P51 - 395 lbs.
FUEL: Spec Fuel.
Dual braking system required.
OTHER: (1) Class runs both race days for a single points championship. (2) Comer P51 minimum timing 0.090” BTDC, minimum squish 0.048”, 12 cc combustion chamber volume.

362.14 IAME SPRINT (FINAL 1 & FINAL 2)

DRIVER REQ: Age 16 and older. Road Race Class 3 License.
ENGINES: Stock Parilla Leopard and X30.
AIRBOX: Stock OEM
FUEL: Spec Fuel.
MINIMUM WEIGHT:  X30 = 390 lbs. -- Leoparrd = 375 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 not required. Rear disc minimum diameter - 7” --- minimum width - 3/16”  (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 360.4.3.1 and figure 360.4.4.1 (9) No butterfly style steering wheels allowed. (10) Standing start procedure utilized.

362.15 TAG HEAVY (FINAL 1 & FINAL 2)

DRIVER REQ: Age 16 and older. Road Race Class 2 TaG License.
ENGINES & MINIMUM WEIGHTS: Cheetah SQ 125 – 370 lbs., , Easykart IAME & BMB – 360 lbs., Motori Seven – 425 lbs., Stock Parilla Leopard – 370 lbs., Ported Parilla Leopard – 390 lbs., Parilla X30 -  370 lbs. PRD Fire Ball (2005 & 2008) - 360 lbs., Rotax FR 125 – 390 lbs., Sonik TX 125 (125cc) – 425 lbs., Sonik VX 125 (118 cc) – 390 lbs., Vortex Rok TT – 400 lbs.
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.
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 not required. Rear disc minimum diameter - 7” --- minimum width - 3/16”  (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) 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. (12) Class runs both race days for a single points championship.

362.16 STOCK HONDA (FINAL 1 & FINAL 2)

DRIVER REQ: Age 18 and older. Road Race Class 2 Shifter License.
ENGINE: For engine rules, see Section 620.0. NOTE: For 2015 legacy cases, aftermarket bearings, seals, gasket, micro-polished transmission gears are all legal -- must conform to 620.0 in full by December 15, 2015.
TRANSMISSION: See Section 620.
INTAKE SILENCER: Air cleaner or air box is required. (See Section 551.4.2.) Where specific track or ordinance requires the use of an air box, 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: RLV R2, RLV R4, RCE T-3 or SKUSA SK-1.
INTAKE SYSTEM: Stock Keihin 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 the 125 Sprint Shifter Seat rule 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. (7) Coating of head gasket legal. (8) four wheel brakes required.

362.17 125 SPRINT SHIFTER (FINAL 1 & FINAL 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 air box. Motorcycle requires air box (See 551.4.2.) and/or air filter.  Where specific track or ordinances requires the use of an air box, this will be noted on entry form. Competitor is responsible to maintain compliance with any rules or ordinances regarding noise regulation.
FUEL: Open Fuel.
MINIMUM WEIGHT: CIK Bodywork with Stock Honda 390 lbs.;
CIK bodywork with modified engine 400 lbs.; Full bodywork 420lbs.
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) Class runs both race days for a single points championship. (9) WKA sprint bodywork allowed; bumper and nerf bar rules apply to these kart 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. (9) four wheel brakes required.

362.18 CIK/LO206 SPRINT (FINAL 1 & FINAL 2)

(NON-NATIONAL -- LOCAL CLASS OPTION)

DRIVER REQ: Age 15 and older. Road Race Class 3 License. 
CHASSIS: Must see Man Cup CIK sprint chassis rules per section: 200.
ENGINE: Briggs & Stratton LO206 (see Section 708 for engine rules).
HEADER PIPE AND SILENCER: See section 708. 
CLUTCH: Any rim centrifugal clutch with a maximum of 9 springs and 6 shoes. No alteration to clutch allowed, except springs. Clutch coolers not allowed.
MINIMUM WEIGHT: 375 lbs. 
FUEL: Gasoline. 
TIRES: Open tires, rear tires 7'' minimum width. 
REAR TRACK WIDTH: A minimum of 50'' and maximum of 55 1/8''.
OTHER: (1) Dual brakes required (2) Bobywork: CIK style bodywork only, conforming to all the dimensions listed in Section 200.


CLASS STRUCTURE

LAYDOWN CLASSES

*ALL CLASSES NOTED AS FINAL ONE + FINAL TWO RUN BOTH DAYS FOR A SINGLE YEAR END CHAMPIONSHIP
*ALL AGES ARE ATTAINED AGE
*ALL LAYDOWN CLASSES MUST USE A DUAL BRAKING SYSTEM, UNLESS OTHERWISE NOTED

312.1 JUNIOR ENDURO (FINAL 1 & FINAL 2)

DRIVER REQ: Age 12 through 16 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 box muffler or RLV SBX muffler and 26S Header with tube protruding through flange intact, 11.0” to 12.0” of flex from piston face to end of flex. 7/8” restrictor. (See Section 554.2 and 554.3)
FUEL: Spec Fuel.
MINIMUM WEIGHT: 340 lbs

312.2 YAMAHA SPORTSMAN MEDIUM (FINAL 1 & FINAL 2)

DRIVER REQ: Age 15 and older. Road Race Class 3 License.
Yamaha KT100S (Only heads with OEM casting “Yamaha” and cylinders with Y3 or Y4 and 787), ARC Comer and PRD RK 100.
ENGINE WITH SBX MUFFLER: Yamaha KT100S (Only heads with OEM casting “Yamaha” and cylinders with Y3 or Y4 and 787). 
ENGINE IAME X30: Rules per section 609 -- exceptions: airbox, starter, battery and chain guard components may be removed.  Axle clutch and belt drives allowed.
EXHAUST: (1) 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 554.2)
MINIMUM WEIGHT: 385 lbs
FUEL: Spec Fuel.

312.3 YAMAHA SPORTSMAN HEAVY (FINAL 1 & FINAL 2)

DRIVER REQ: Age 15 and older. Road Race Class 3 License.
Yamaha KT100S (Only heads with OEM casting “Yamaha” and cylinders with Y3 or Y4 and 787), ARC Comer and PRD RK 100.
ENGINE WITH SBX MUFFLER: Yamaha KT100S (Only heads with OEM casting “Yamaha” and cylinders with Y3 or Y4 and 787).
EXHAUST: (1) 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 554.2)
MINIMUM WEIGHT: 410 lbs
FUEL: Spec Fuel.

312.5 YAMAHA SENIOR

DRIVER REQ: Age 16 and older. Road Race Class 3 License
ENGINES: Yamaha (Only heads with OEM casting “Yamaha” are legal.)
EXHAUST: Any fixed WKA approved pipe.
FUEL: Spec Fuel.
MINIMUM WEIGHT: 400 lbs.

312.6 100cc PISTON PORT (FINAL 1 & FINAL 2)

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 BT82, PRC PP-100, DAP T-50, HPV 100, Komet Piston Valve.
EXHAUST: Any fixed WKA approved pipe.
FUEL: Spec Fuel.
MINIMUM WEIGHTS: Yamaha: 385 lbs; Piston Port: 410 lbs; Comer P51: 425 lbs.
OTHER: Comer P51 minimum timing 0.090” BTDC, minimum squish 0.048” -- 12cc minimum combustion chamber volume.

312.7 100CC CONTROLLED (FINAL 1 & FINAL 2)

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 IR2 pipe at a minimum of 8.75” from piston to end of connector pipe) (see Figure 554.6 for IR2 Specs) All engines – 1.75” header.
FUEL: Spec Fuel.
MINIMUM WEIGHTS: Yamaha and Piston Port engines 360 lbs. Controlled or ICA engines 390 lbs.
OTHER: (1) ICA Reed (See Section 607, 608 and Figures 608.2, 608.3a and b for approved engines and specifications). (2) WKA approved 1 3/4” header and pipe only; head volume 9cc’s and Tillotson HL360A carburetor (See Figure 554.6 for IR2 Specs. See Section 607.3 for carb specs).

312.8 FORMULA 100 (FINAL 1 & FINAL 2)

DRIVER REQ: Age 16 and older. Road Race Class 2 License.
ENGINE, FUEL, WEIGHT:
100cc Open – Open fuel – 410 lbs.
100cc Stock Appearing Piston Port – Open Fuel – 310 lbs.
100cc Stock Appearing Reed or Rotary Valve – Spec Fuel – 390 lbs.
100cc Controlled Stock 2000 – Spec Fuel – 370 lbs.
135cc Controlled Stock – Spec Fuel – 370 lbs. – Any WKA approved pipe
EXHAUST: All engines can run a WKA approved slippy or fixed pipe. Exception: All headers must be 1 3/4” except Open engines.
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.

312.9 FORMULA 125

DRIVER REQ: Age 18 and older. Road Race Class 1 License.
ENGINES: 125 Gearbox (laydown), B Limited (150cc Open), or 100cc Open.
EXHAUST: 125 Gearbox - no adjustable pipes. B Limited and Open - any WKA approved pipe.
FUEL: Open.
MINIMUM WEIGHT: B Limited 380 lbs -- 125 Gearbox: 420 lbs -- 100cc Open: 375 lbs.

312.10 UNLIMITED (FINAL 1 & FINAL 2)

DRIVER REQ: Age 18 and older. Road Race Class 1 License.
ENGINES(S), WEIGHT, CARBUREATOR:
One 250 cc gearbox twin cylinder, 490 lbs, See Note 7.
One 250 cc gearbox single cylinder, 460 lbs, 39mm carb, See Note 4.
One 450 cc gearbox single cylinder 4-cycle, 460 lbs., 42mm carb, See Note 5.
One 125 cc gearbox single cylinder, 420 lbs.,
One 250 cc single cylinder non-gearbox, 460 lbs., any carb.
One 150 cc single cylinder 380 lbs., any carb(s).
Two 150 cc single cylinder 490 lbs., any carb(s).
Two 100 cc single cylinder 465 lbs., any carb(s).
Two 135 cc single cylinder fan cooled (West Bend 820 and Mac 101), 420 lbs., any carb(s).
FUEL: Open
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: (1) Additional restrictions may be placed on these engines at any time if it is deemed necessary to maintain parity within the class (2) Unlimited races will run for 30 minutes (3) See USSK rules for detailed engine specifications for 250 cc Twin Cylinder karts. Class runs both race days for a single year end championship.

312.11 B-STOCK

DRIVER REQ: Age 18 and older. Road Race Class 1 License.
ENGINES: Yamaha; Piston Port; 100cc Controlled. All engines may be stock appearing except ICA Reed (i.e. Reed Jet, PCR, etc.) which must be controlled stock specifications.
EXHAUST: Any Fixed WKA approved pipe (No adjustable pipes allowed)
FUEL: Open fuel.
MINIMUM WEIGHTS: Yamaha & Piston Port engines: 395 lbs.; 100cc Controlled: 465 lbs.
OTHER: Karts must be dual-engine with engines of like category.

312.12 X30 (Final 1 and FINAL 2)

DRIVER REQ: Age 15 and older. Road Race Class 2 License
ENGINE: IAME X30.
FUEL: Spec gasoline.
MINIMUM WEIGHT: 410 lbs.
EXHAUST: RLV X30-1 minimum length 10'' (See 609.9.2).