In stock classes, no change or modification can be done to the snowmobile unless specifically allowed by these rules. If these rules do not specifically allow a change or modification, then it must be assumed that the change or modification is not allowed

STOCK CLASSES

1) VINTAGE

Maximum displacement is 440cc liquid cooled and 500cc air-cooled, 1981 or older leaf spring

models only.

2) VINTAGE LEGENDS

Same machine rules as VINTAGE, but riders must be age 50 or older at time of event.

GENERAL

1) The snowmobile must have the original OEM engine, hood, exhaust, frame, suspension and cowl. Replacement parts must be of same model and year.

 

ENGINE

1) Engine must remain in original mounting location

2) No component of the engine may be altered, changed or enlarged from the engine manufacturer’s original stock specifications. No removal of material whatsoever will be allowed.

3) Maximum cylinder overbore for wear or repair cannot exceed .020 inch.

4) There will be no more than one cylinder base gasket to a cylinder.

5) No modification to the carburetor body allowed. Jets and slides may be changed.

6) An adequate return spring on the throttle is required.

7) Choke mounting location may be moved for driver comfort. Choke system can’t be disconnected.

The exhaust system is to include any, header flange or pipe, Y pipe, expansion chamber, pulse charger, muffler and tail pipe that are original OEM equipment for that make and model. NO changes or modifications will be allowed to any part of the exhaust system or mounting locations.

DRIVE

1) Any OEM or aftermarket variable speed converters are allowed.

2) Any springs, weights or ramps may be used.

3) No machining on clutches to accommodate springs and weights.

4) In the primary clutch, metal may be removed but not added to ramps or flyweights.

5) Secondary clutch cams may be cut to any angle. Billet helixes allowed.

6) No overdrive machining.

7) Drive belts do not have to be OEM.

Chain case, drive shaft and drive sprockets may be changed to any OEM to accommodate track/brake changes. Shaft material may not be changed from OEM material for model year.

9) Any drive chain and sprockets may be used.

10) Chain tensioner may be changed to any OEM equipment.

11) Brakes may be changed or altered, but must be operational at all times. Brake components must be commercially available. Brake disk may not be modified in the pad contact area. Brake disk hub may be modified for mounting. OEM diameter and thickness must be maintained. The brake disk material may not be substituted with any other material.

12) Existing vents may be used to direct cooling air to the brake components. However ducting must remain under hood, and additional vents or scoops may not be added.

SKIS, SKI SUSPENSION, SKI RUNNERS AND STEERING

1) Front suspension must remain in original mounting location, in both bulkhead and spindle housing. No substitution of material allowed.

2) Reinforcement of components will be allowed by welding or bracing. Structural integrity must be maintained.

3) Spindles may not be shortened.

4) Ski stance must remain OEM center to center. No ski spreaders allowed.

5) Any ski shock allowed.

6) Any ski allowed. Skis may be reinforced on top-side only.

7) Ski skins allowed.

Ski loops leading edges on steel skis must be padded.

9) Any commercially available handlebar allowed. May be altered to fit driver. Open ends must be capped. Handlebars must be padded. Column or post must remain in its OEM position. Grips and controls may be modified. Throttle will be opened with a thumb mechanism (no twist grips).

TRACK SUSPENSION

1) Suspension must be OEM for the make and model. No material substitution allowed.

2) Rails may not be bent or shortened.

3) Wheels may be added or removed along with mounting brackets from an OEM wheel kit.

4) Any hyfax allowed.

5) Any spring may be used in the rear suspension. Springs may be shortened or heated.

6) Any commercially available shocks allowed.

TRACK AND TRACTION

1) Any commercially available, one piece track allowed.

2) Studs cannot be more than 3/8 inches above the highest point of the track.

FRAME & BODY

1) Snowmobile overall width is as produced.

2) Removal of any material from total machine by any means will not be allowed.

3) Skid plates may be added. Skid plates must be securely fastened

4) Additional plate material may be added to the tunnel at the suspension mounting holes.

5) Fuel lines must be free of obstructions by other machine components.

6) Additional OEM or aftermarket fuel tank may be added for additional fuel range. Additional tank must be securely fastened.

7) Seat padding may be added for additional driver comfort.

IGNITION & ELECTRICAL

1) Ignition must be OEM for the year and model.

2) Fixed ignitions may be moved (+ or -) four (4) degrees.

3) Wiring may be removed.

4) Head and tail lights must be original OEM equipment for the model and must remain in original mounting locations.

5) Headlight, taillight and brake light must be operational at all times.

6) Glass lenses must be taped with transparent tape. No colored tape allowed.

7) All snowmobiles must have a minimum of two (2) forms of ignition “kill” switch that must be operable at all times. One (1) form of “kill” switch must be a tether switch.

Maximum tether cord length will be 5 feet. The tether switch will be mounted in a location on the snowmobile other than on the handlebars or steering column.

9) The tether cord will be securely fastened to the driver. No alligator clips allowed.