Midwest Vintage Racing
77-83 250 CLASS
1977 to 1983, production line model with a single cylinder fan cooled 250 motor.
NO JACK SHAFT CHASSIS
No changes or modification allowed unless specified by these rules. If these rules do not specifically allow a change or modification, it is assumed that the change or modification is not allowed.
Engines:
- Engines must be stock in the model and year of sled you are running.
- Engines must remain stock, no grinding, porting, sandblasting, shaving on anything.
- Pistons can be stock or aftermarket unaltered replacement, no cutting skirts. (Max over bore 1 mm (.040)
- Stock carb or any aftermarket carb (aftermarket carb 34mm max)
- Any Primary Clutch
- Engine may have the OEM CDI or factory points (No modifications allowed)
- Must have stock, unaltered fan and stock recoil.
- None Ethanol gasoline and race gasoline only, NO E-85, Alcohol, Nitro Methane or any other fuel allowed.
- Head pipe and muffler must be stock, unaltered and in stock location
- You can update the spine crank to a 30mm taper crank
Fuel Tank:
- Fuel tanks must be stock and mounted in stock location, 250 Enticer can run 300 Enticer tank
Chassis:
- 1977 to 1983, Enticer 250-300 or 340 chassis.
- Bulkhead must be stock and unaltered. Reinforcement and bracing only.
- Chain, Chain Cases and secondary clutch must be stock and unaltered
- Skis must be original or stock replacement. NO Aluminum or unsafe SKIS! carbide allowed
- You must run a stock hood and belly pan. ( hood my be altered but not belly pan)
- 24” Leaf Spring minimum length.
- Max ski spread of 34” measured center to center of ski. Ski spread will be checked after race. Spindle must be stock and unaltered.
- Numbers must be 8” and visible on both sides. (Should be black and white)
- Any seat may be used and any handle bars.
- Your brakes must be in working condition. (Will be checked)
- Brake MAY BE MOVED from stock location, relocated and converted to hydraulic.
(IE Extended OEM Drive Shaft with disc) May use hydraulic brake setup off of newer sled.
- Snow flap must touch ice/snow with rider on machine.
- Must have a working tether cord and USE it. Must be mounted to the frame.
- Gearing my not be changed ET 250 GEARING ONLY
- Must have steel OEM belt guard
Suspension and track:
- Suspension must be stock and unaltered and mounted in stock location
- Track must be stock and unaltered (Upgrading clips will be allowed)
- Track Studs can measure a maximum of 1⁄2” max past lug. Will be checked with a “Go No Go ‘gauges.