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
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.
1) The snowmobile
must have the original OEM engine, hood, exhaust, frame, suspension
and cowl. Replacement parts must be of same model and year.
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.
8) 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.
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.
8) 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.
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SKIS,
SKI SUSPENSION, SKI RUNNERS AND STEERING
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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.
8) 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).
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.
1) Any commercially
available, one piece track allowed.
2) Studs cannot be more than 3/8 inches above the highest point of
the track.
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.
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) 5) Headlight, taillight and brake light must be operational at
the start of the race.
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.
8) 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.
