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.

- Non 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

- You can have a second coil mounted on the sled but Must be in stock location and not hooked up.

Fuel Tank:

- Fuel tanks must be stock and mounted in secure fashion, 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! 10in max 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 6” 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 13/22 GEARING ONLY

- Must have steel OEM belt guard

- Slide lubrication or ice scratchers allowed.

- Any anolog or digital tach allowed.

Suspension and track:

- Suspension must be stock and only reinforcing allowed 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.

- NO extra boogie wheels to be added.