2017 Official Race Rules

Must be at least 16 years old with a valid driver’s license and prior approval from Scott Worden to race (Excluding Kid’s Mini Races). All other drivers must have a valid state ID.

Each team must have their own FIRE EXTINGUISHER on hand in their pits.

Maximum of Three drivers per sled. Registered drivers are the only ones allowed to drive that sled, if your sled breaks you cannot drive another sled. Qualifying driver must start race on that sled.

NEW RULE 2017: Adult RacersĀ helmets must be at lease 50% ORANGE.

The race will be timed/scored with an electronic scoring system.

All race sleds must have a transponder placed on the sled in an acceptable position to participate in the race.

There will be 1 segment consisting of 250 Total Laps. Yellow flagged laps DO count.

Track will be plowed at discretion of Race Director.

Two types of chassis are allowed to race in the TC250 Enduro.
a. Existing 1975 and Older Chain Case Sleds will follow the same guidelines as previous years.
b. New as of 2014, year 1980 and older Jackshaft Chassis will be allowed. Chassis deemed to be Factory race sled will not be allowed to race in the Enduro.
c. Chassis NOT allowed:

i. Sno Jet Thunder Jet, Blissard, Moto Ski Equivalent (all years).
ii. 1976 Merc Sno Twister
iii. Artic Cat Z, Rupp Magnum Sno Pro (1976 & Newer)
iv. Polaris Starfire & RXL (1973 & Newer)
v. Yamaha SSR & 76-77 SRX
vi. Check with Race Official for other sleds that may not be listed


1975 & Older chassis with ski leafspring front suspension. NO IFS! MUST have tower type chain case. Chain case repplacement/Upgrade allowed. May use 1985 or older components. No chain case to conversions. No jackshafts allowed. NO re-badging 1976 or newer chassis with pre 1975 tunnels. Previously raced sleds can continue to race.

1980 & Older chassis may be Jackshaft or tower type chain case. Must be Ski leaf Spring Front Suspension. NO IFS! Front ends CANNOT be widened. Must maintain stock spindle to spindle measurement. Bulk Heads may be strengthened or altered to mount engine but may not be widened.

1985 & Older Stock Style Snowmobile Rear Suspension. NO aftermarket Race Skid Frames. NO slide Lube Systems. Rubber track conversions are allowed.


Skis: Original, Stock, or aftermarket Ice Skis Allowed. Must have ski hoops. Hoops must be wrapped with Foam Pipe insulation and taped for safety. Do not use Saftey Orange Tape to wrap hoops.

Maximum 3 INCH Ski Spreaders allowed. Over all Maximum Ski Stance is 40 INCHES. All Chassis measured from center or carbide on skis.

Offset or Extended Front ends allowed on 1975 & Older chassis ONLY! Must not exceed Maximum Ski Stance of 40 INCHES (measured center to center of carbide). Offset or extended Front Ends MUST have Nerf Type Protection Bars to protect other drivers from being injured in the event of a crash. Maximum Offset is 7 INCHES per side, measured from side of tunnel to outside of Nerf bar. NO offset front ends on 1980 to 1976

Runner Board Type Nerf or Foot Bars allowed BUT must be inlineof Body/Tunnel Line. MUST NOT PROTRUDE OUTSIDE OF BODY LINE.

There are NO Fuel Tank size/capacity limitations.

Hood is required. Does not need to be original. 1980 or Older unless approved by Race Officials.

Clutch Guard is required. Stock OEM allowed. 1/8 6061 Aluminum or 3/32 Steel. Must cover Primary and secondary Clutches and Belt.

Must have a working tether and brake.

Helmet and Tek Vest required.

Minimum 6″ sled number on windshield and back of Tek Vest.




a. Must be a 1980 or Older Production Snowmobile Fan Cooled Single Cylinder Engine.
b. Cooling system concept must be maintained and fully functioning.
c. NO Free airs or Liquid Cooling.
d. Brand mixing allowed.
e. Engine must use production Fan cooled case and cylinder for engine.
f. Fan MUST be installed and functioning.
g. Engine must consist of snowmobile manufactured parts only. NO ATV or motorcycle parts allowed.

Reed Valve and Reed Valve conversions are allowed. Reed valve engine must use stock OEM style carb or Mikuni VM round slide carb. 38MM MAX size. NO overboring or taperboring. 38 MM max I.D.

Carb can be any Brand, Style, and size allowed on piston port engines. (Except Reed Valve Motors-Read previous).

Ignition- programmable ignitions systems allowed in all classes. Ignition reprogramming is NOT allowed in the staging area or on the racetrack. Points and CDI allowed.

Exhaust- Any brand or tuned pipe allowed. Pipe must exit withinBelly Pan and/or under running board.

Clutching- Any snowmobile type clutches are allowed. Secondarymust be Button Style. NO roller secondaries.

Fuel- Pump, AV, Rec, or Race Fuel Allowed. NO Alcohol or Nitrous.

Ice oval track, studs and carbides required. Maximum stud length 3/8 of lug. Gauge will span 3 lugs.

Working taillight recommended.

No Alcohol used by drivers or pit crew members BEFORE OR DURING THE RACE!

Aggressive or intentional abusive driving WILL NOT BE TOLERATED. Driver will be black flagged and immediately disqualified from race.

ALL Racers and crew members must accept and respect officials’decisions. Any questions, concerns, disagreements, or complaints can be calmly discussed with Race Officials and reviewed with proper persons involved in matter. All penalties and disqualifications will be determined and enforced by Race Officials and must be accepted by participants uncontested.

Disqualified sleds will forfeit entry fees. Sleds unable to race due to mechanical issues will also forfeit entry fees.

Length of race and race format may be changed on race day due to conditions. Race Officials reserve the right to make these changes before, on, and during race. Any changes will be announced before or during race.

For additional Information & rules contact:
Scott Worden @ (231) 313-2616.