Classes

Nicholson Speedway will add any class to regular schedule even if not listed below. The class structures listed are a guide from AKRA and VKA.

Note: SFI Certified Chest Protector is required on ALL Drivers of the AGE 12 and under.

 

Nicholson Speedway 2018 LO206 Class Structure

 

LO206 Kid Kart

Age: 5-8
Weight: 200#
Engine: Briggs & Stratton LO206 Kid Kart Package #124332-8202
Seal: Factory B&S seals must be intact – no tampering
Ignition: B&S “Black” #555725 – Max RPM: 4,150
Carb Slide: B&S Black # 555732, Opening .310”
Carb Top Lock: B&S #555726 required
Fuel Catch Can: Required for bowl vent tube
Fuel: Spec 87 octane fuel
Air Filter: B&S Green #555729 required – no mods
Spark Plug: B&S #555737 Champion RC12YC with Champion and B&S logo
Header: RLV 5506 or 5507 – No modifications
Silencer: RLV B-91XL silencer PN# 4104 – No modifications
Clutch: Max Torque Model SS17334IK (B&S #555727) – no mods
Spec Gear: 17 tooth front, 57 tooth rear #35 chain
Tires: Vega Red 4.60×5
Max Wheel Width: 7″ No Go
Chassis: Kid Kart, Cadet, or Full Size allowed
Bodywork: CIK or Full Coverage “Gold Cup” – per AKRA

(NOTE: All kid kart classes are exhibition races, no points as this is a learning class)

Donnelly’s Dockside LO206 Sportsman

Age: 7-12
Weight: 265#
Engine: Briggs & Stratton LO206 #124332-8201
Seal: Factory B&S seals must be intact – no tampering
Ignition: B&S “Green” ##555718 – Max RPM: 6,150
Carb Slide: B&S Green # #555740), Opening .490”
Carb Top Lock: B&S #555726 required
Fuel Catch Can: Required for bowl vent tube
Fuel: Spec 87 octane fuel
Air Filter: B&S Green #555729 required – no mods
Spark Plug: B&S #555737 Champion RC12YC with Champion and B&S logo
Header: RLV 5506 or 5507 – No modifications
Silencer: RLV B-91XL silencer PN# 4104 – No modifications
Clutch: Drum clutch with a maximum of 9 springs and 6 shoes
Tires: Vega Red 4.60×5 front/rear or optional 6.00×5 rear
Max Wheel Width: 7″ on 4.60, 8.25″ on 6.00 – No Go
Chassis: Cadet or Full Size allowed
Bodywork: CIK or Full Coverage “Gold Cup” – per AKRA

 LO206 Junior

Age: 12-15
Weight: 320#
Engine: Briggs & Stratton LO206 #124332-8201
Seal: Factory B&S seals must be intact – no tampering
Ignition: B&S “Green” ##555718 – Max RPM: 6,150
Carb Slide: B&S Yellow # ##555741), Opening .570”
Carb Top Lock: B&S #555726 required
Fuel Catch Can: Required for bowl vent tube
Fuel: Spec 87 octane fuel
Air Filter: B&S Green #555729 required – no mods
Spark Plug: B&S #555737 Champion RC12YC with Champion and B&S logo
Header: RLV 5506 or 5507 – No modifications
Silencer: RLV B-91XL silencer PN# 4104 – No modifications
Clutch: Drum clutch with a maximum of 9 springs and 6 shoes
Tires: Vega Red 4.60×5 front 6.00×5 rear
Max Wheel Width: 7″ on 4.60, 8.25″ on 6.00 – No Go
Chassis: Full size only – no cadet chassis
Bodywork: CIK or Full Coverage “Gold Cup” – per AKRA

LO206 Senior

Weight: 375#
Engine: Briggs & Stratton LO206 #124332-8201
Seal: Factory B&S seals must be intact – no tampering
Ignition: B&S “Green” ##555718 – Max RPM: 6,150
Fuel Catch Can: Required for bowl vent tube
Fuel: Spec 87 octane fuel
Air Filter: B&S Green #555729 required – no mods
Spark Plug: B&S #555737 Champion RC12YC with Champion and B&S logo
Header: RLV 5506 or 5507 – No modifications
Silencer: RLV B-91XL silencer PN# 4104 – No modifications
Clutch: Drum clutch with a maximum of 9 springs and 6 shoes
Tires: Vega Red 4.60×5 front 6.00×5 rear
Max Wheel Width: 7″ on 4.60, 9.75″ on 6.00 – No Go
Chassis: Full size only – no cadet chassis
Bodywork: CIK or Full Coverage “Gold Cup” – per AKRA

For full LO206 Rules please go to www.briggsracing.com

Nicholson Speedway 2018 4 Cycle Class Structure

 

 

 JUNIOR I  Age 8 to 10 years – 265 lbs. – Methanol only – Approved engine: Briggs & Stratton Raptor stock 5hp only, with .425 inch maximum intake restrictor, no steering fairing allowed, maximum nose height 14 inches from ground level to top of nose, and AKRA approved exhaust required.

JUNIOR II  Age 10 to 12 years – 290 lbs. – Methanol only – Approved engine: Briggs & Stratton Raptor stock 5hp only, with .500 inch maximum intake restrictor, no steering fairing allowed, maximum nose height 14 inches from ground level to top of nose, and AKRA approved exhaust required.

JUNIOR III   Age 12 to 15 years – (320 Animal-290 lbs. Raptor) – Methanol only -Approved engine: Briggs & Stratton Raptor stock 5hp only, with .575 inch(Raptor), and .505 inch(Animal) maximum intake restrictor, and AKRA approved exhaust required.

STOCK LITE   Age 15 years & up – 330 lbs. – Methanol only – Approved engine: Briggs & Stratton Raptor stock 5hp only, with AKRA approved exhaust required.

STOCK MEDIUM   Age 15 years & up – 350 lbs. – Methanol only – Approved engine: Briggs & Stratton Raptor stock 5hp only, with AKRA approved exhaust required.

STOCK HEAVY  Age 15 years & up – 375 lbs. – Methanol only – Approved engine: Briggs & Stratton Raptor stock 5hp only, with AKRA approved exhaust required.

375 FLATHEAD  Age 35 years & up – 375 lbs. – Methanol only – Approved engine: Briggs & Stratton Raptor stock 5hp only, with AKRA approved exhaust required.

STOCK SUPER HEAVY   Age 15 years & up – (400 lbs. Animal-375 lbs. Raptor) – Max Kart weight 200 lbs – Methanol only – Approved engine: Briggs & Stratton stock 5hp only, with AKRA approved exhaust required.

ANIMAL  Age 15 years & up – 360 lbs. – Methanol only – Approved engine: Briggs & Stratton stock Animal 5.5hp only, with AKRA approved exhaust required. Tires: Vega Blue 4.60×5 front 7.10×5 rear

(Note: Pro Gas also allowed in Animal Class)

BRIGGS LIMITED MODIFIED  Age 15 years & up – (375 lbs. Animal-350 lbs. Raptor) -Methanol only- Approved engine: Briggs & Stratton 5hp Limited Modified or Animal Modified with any Tillotson HL-series carburetor with .850 inch minimum and .900 inch maximum venturi diameter, and AKRA approved exhaust required. Auxiliary vacuum fuel pump, pulsed from the intake, is permitted.

           

Nicholson Speedway 2018 2 Cycle Class Structure

 

Comer Kid Kart

Age: 5-7
Engine: Comer C51
Fuel: Gas & Oil
Weight: 150 lbs.
Tires: Vega Red 4.60×5
Gear Ratio: 10/89

(NOTE: All kid kart classes are exhibition races, no points as this is a learning class)

Yamaha Sportsman

Age: 7-12
Engine: Yamaha KT100
Exhaust: RLV SSX-V #7548
Carb: Walbro WA55B w/WA55B manifold
Fuel: Gas & Oil
Weight: 235 lbs.
Tires: Vega Red 4.60×5
Other: No Axle Clutches

IAME Mini-Swift

Age: 7-10
Engine: IAME Parilla Swift 60cc
Exhaust: 16mm Restricted Header w/stock pipe
Carb: Tillotson HW-31A
Fuel: Gas & Oil
Weight: 225 lbs.
Tires: Vega Red 4.60×5
Chassis: Cadet or Standard chassis allowed

IAME Pro Swift

Age: 8-12
Engine: IAME Parilla Swift 60cc
Exhaust: Stock header and pipe
Carb: Tillotson HW-31A
Fuel: Gas & Oil
Weight: 245 lbs.
Tires: Vega Red 4.60×5
Chassis: Cadet or Standard chassis allowed

Yamaha Junior

Age: 12-15
Engine: Yamaha KT100
Exhaust: RLV SSX-V #7548
Carb: Walbro WB3A
Fuel: Gas & Oil
Weight: 310 lbs.
Tires: Vega  4.60×5 front 7.10×5 rear
Other: No Axle Clutches

Yamaha Senior

Age: 15-up
Engine: Yamaha KT100
Exhaust: RLV SR-Y pipe w/9110 header
Flex: 1.75″ dia – 9.5″ from piston to flex end
Carb: Walbro WB3A
Fuel: Gas & Oil
Weight: 360 lbs.
Tires: Vega 4.60×5 front 7.10×5 rear
Other: No Axle Clutches

TaG Junior

Age: 12-15
Engines & Class Weights:
(1) Rotax Junior Max – 320#
(2) IAME Leopard w/Factory 25mm Header – 320#
(3) IAME X30 w/Factory 29mm Header – 320#
(4) PRD w/ RLV filter cup with an air inlet hole of 0.877” no go – 320#
Exhaust: Stock, as provided with engine package
Airbox: As provided with engine package
Fuel: Gas & Oil
Tires: Vega 4.60×5 front 7.10×5 rear
Other: All engine components must be as provided with engine package

TaG Senior

Age: 15-up
Engines & Class Weights:
(1) Rotax Senior Max – 360#
(2) IAME Leopard – 360#
(3) IAME X30 – 360#
(4) PRD – 345#
Exhaust: Stock, as provided with engine package
Airbox: As provided with engine package
Fuel: Gas & Oil
Tires: Vega 4.60×5 front 7.10×5 rear
Other: All engine components must be as provided with engine package

TaG Heavy

Age: 15-up
Engines & Class Weights:
(1) Rotax Senior Max – 400#
(2) IAME Leopard – 400#
(3) IAME X30 – 400#
(4) PRD – 385#
Exhaust: Stock, as provided with engine package
Airbox: As provided with engine package
Fuel: Gas & Oil
Tires: Vega 4.60×5 front 7.10×5 rear
Other: All engine components must be as provided with engine package

Nicholson Speedway 2018 Vintage Racing Class Structure

 

4 CYCLE CLASSES

 

These classes will compete on Chassis Models that are at least 30 years old per AKRA and VKA (1988 or Older)

STOCK HEAVY  375lbs using AKRA B&S FH Stock Rules (Refer to 2018 Rule Book)

SUPER STOCK  Heavy 375lbs using VKA stock rules used for Barnesville   with.900” Tillotson Carb and fuel pump, 5 hp valves, 234 running lift on cam, stock 5 hp flywheel(unaltered), .060” over Bore(flat top pistons), and stock crankshafts stroke (2.437 +.007” or -.010”).

LIMITED MODIFIED  Heavy 375lbs 80 over using AKRA B&S FH Engine

Rules (Refer to 2018 Rule Book)

OPEN MODIFIED  375lbs 14.5 cu inches, Any approved Billet flywheel, any normally aspirated carburetor, billet bolt on equipment allowed EXCEPT NO BILLET BLOCKS (Cast FH style blocks only) Refer to AKRA 2018 Rule Book

2 CYCLE CLASSES

 

HISTORIC 1956 to 1964 rear engine karts and engines; single, dual, or triple engines, 16.5 c.i. (270cc) max displacement; Must have vintage-style dry clutches or direct drive; box muffler; vintage tire required; Promoter may split class as per VKA Guidelines (Para. 6a, below); duals/triples in front. This is a non-points, Tier II demo class.

 JUNIOR/WOMEN REAR OR SIDEWINDER Junior (Boys/Girls ages 10-14)- Single 100cc (6.1 c.u. in.) max. American Fan Cooled Engine (i.e. West Bend, McCulloch, Power Products, Homelite) or West Bend 820. All engines will run single HL 1” or smaller carb throttle bore. Any intake allowed, but West Bend must use V-Reed or Go Power, 4 or 6 petal cage, Vintage-style dry clutch, box muffler and vintage tires required. Yamaha KT100 engine may be used with WA55 Walbro carb, dry clutch, “limited” exhaust system and vintage tires. (See Yamaha Limited Class for pipe requirements.) (Junior and Women class can run rear or sidewinder kart.)

SPORTSMAN REAR Rear American engines; 8.2 c.i. (135cc) max displacement WB-820 with 8.2 c.i. (135cc) max displacement must be industrial-type; McCullochs must be 6.1 c.i. (100cc) max displacement or saw blocks over 80cc. Small single intake manifold allowed (WB V-reed, Homelite reed, Go Power reed, etc.). Manifold to have an HL bolt pattern, single reed cage manifold only. Single HL 1- inch maximum throttle bore carburetor. Small Mac flat-back carb OK. Must have vintage-style dry clutch, box muffler and vintage tires. MC-91, 92 and 93 engines are allowed. Single Carb manifolds only, No V-4, V-6 or V-12 manifolds. No 91-93 Mac Carbs; No 91-93 Mac Manifolds.

MAC 49/SAW Rear engine karts; Mc49 or 80cc saw block engines. 1.375 maximum stroke; Aftermarket small single intake manifolds allowed (WB V-reed, Homelite reed, Go Power reed, etc.) or factory Mc 49 intake. Manifold to have an HL bolt pattern. Single HL 1-inch maximum throttle bore carburetor or small Mac flat-back carburetor; Vintage style dry clutch; Box muffler; Vintage tires.

SINGLE REAR 6.1 Rear engine karts; American engines only, 6.1 c.i. (100cc) max displacement; pipes and oil clutches allowed; no disc clutches; any carburetor combinations, vintage tires.

SINGLE REAR 8.2 Rear engine karts; American engines only, 8.2 c.i. (135cc) max displacement; pipes and oil clutches allowed; no disc clutches; any carburetor combinations, vintage tires.

DUAL REAR, B- & C-OPEN C-Open: American engines only, 16.5 c.i. (270cc) max displacement; pipes and oil clutches (no disc clutches); vintage tires. Any Historic B or C Class dual engine rear karts may run this class. B-Open: American engines only, 12.2 c.i. (200 cc) max, dry clutch, box mufflers, #35 chain, and vintage tires. (B-Open to be run in concert with C-Open and scored separately.)

SINGLE 6.1 S/W AMER. Pre-1980 sidewinder with American fan cooled engines, 6.1 c.i. (100cc) max displacement; engine clutches only; pipes allowed; modern tires allowed; one-inch axle. Max kart width of 48 inches.

SINGLE 6.1 FOREIGN 8.2 AMERICAN SW Pre-1980 sidewinder with American fan cooled engines, 8.2 c.i. (135cc) max displacement or Foreign or American engines, 6.1 c.i. (100cc) max displacement produced before 1980;; engine clutches only; pipes allowed; modern tires allowed; one-inch axle. Max kart width of 48 inches.

SINGLE 8.2 S/W FOREIGN Pre-1980 sidewinder with Foreign or American engines, 8.2 c.i. (135cc) max displacement produced before 1980; engine clutches only; pipes allowed; modern tires allowed; one-inch axle. Max kart width of 48 inches.

OVER-60 Drivers 60yrs +; Rear or pre-1980 sidewinder karts; American, fan-cooled, 6.1 c.i. (100cc) max displacement engines; pipes allowed; oil clutches allowed; no disc clutches; vintage tires; any carburetor combinations. Promoters should consider separating the sidewinder and rear engine karts for scoring purposes when participation is sufficient to do so. Allow sidewinders to start in the front. Max kart width of 48 inches.

DUAL SIDEWINDER Sidewinder with Foreign or American engines, 16.5 c.i. (270cc) max displacement; engine clutches only; pipes allowed; modern tires allowed. Tire compound durometer minimum of 48. Bridgestone YLC and MG tires allowed. May use any approved single sidewinder tire (see par. 6b, below); 1¼” axle allowed if original; karts and engines must be manufactured prior to ‘83.

SIDEWINDER 1980 – 1987 sidewinder with Foreign or American engines, 6.1 c.i. (100cc) max displacement; pipes allowed; engine clutches only; modern tires allowed; 1¼” axle allowed; kart and engine must be manufactured prior to 1988 – see Engine Schedule. (Para. 6c, below) Max kart width of 50 inches.

 SPORTSMAN S/W (STOCK APPEARING) Sidewinder (pre-1980) with 6.1 c.i. (100cc) max displacement, American fan cooled engine; single carburetor (Mikuni, Tillotson, or McCulloch), any size throttle bore; Factory V4 intake; modern tires allowed until 12/31/2018; box muffler; vintage-style dry clutch (Horstman Rev Grip or Max-Torque). Effective 2019: Vintage tires only. West Bend-Only Class- Stock appearing West Bend 820 with stock bore and stroke (fan cooled), box muffler, small, single West Bend

 

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All other Race Karts are more than welcome to come to our Facility.