Mild Build Class rules
Info
Due to the Decline in One Lunger Racing, The purpose for this class is to make it very easy for enthusiasts to enter a race without having to over-engineer a vintage snowmobile. To be able to be competitive at a much lower budget. Running low horsepower motors, giving these motors and other sled brands a purpose for their existence…
General Rules
-There will be no pre-race tech. Tech will only be done after the race to the top 3 winners. The drivers meeting will happen before the race.
-All racers and participants must accept and respect the officials’ decisions.
- No Wheeled atvs or side-by-sides past the parking lot.
-Respect the racing property as it is a private area, Please be mindful of that so we don’t lose our privileges for hosting it on this area.
-There will be NO alcohol or drug use by drivers or pit crew before or during the race.
-Helmets are required during racing and warm up.
- Tethers are not required
-No excessive speed in the pit area.
-No unaccompanied children in the pit area.
-Rubbing and bumping happens, but aggressive driving WILL NOT be tolerated.
-Lapped traffic should allow faster traffic time to pass. Faster traffic should be courteous to lapped traffic.
-All general flagging rules apply. Talk to flagmen on race day with any questions.
-No cutting corners. The staking lath are not suggestions, they mark the inside of the course turns and edge of course on straights.
-Re-fueling MUST take place in the pit area. If you run out of gas on the course you MUST be towed in and re-fuel. NO extra gas can be carried on the sled during the race.
-PITTING & TOW-IN.... -If you are pitting you MUST enter the pit area through the entrance and leave the exit to start your next lap. If you are getting towed in or riding a disabled sled into the pits (not completing the entire race course for that lap) you may enter the pits on either end (entrance preferred) as long as it is done safely. You MUST leave the pit area out the exit and start a new lap.
- Lap count will be an old fashion mark on paper, So be patient we will do the best we can.
-YOU are responsible for your pit area cleanliness.
Additional Notes:
-Length of race may be changed on race day due to track conditions.
-Officials reserve the right to make changes before race day. These changes will be announced before the race.
-All penalties and disqualifications will be determined and enforced by race officials and must be accepted by participants without question.
- DQ’ed sleds entry fee will be forfeited
MIld Build Class rules
DRIVER
SNOWMOBILE
No Arctic Cats or Yamaha SM chassis allowed
The motor must be 16.5 HORSE OR LOWER, that was offered in 1973 or before.
CHASSIS: 1973 & older chassis. No race model or jackshaft chassis. Must be an original Bogied Suspension Chassis, 1973 or older no converting slides suspension chassis to bogies. I.e. Converting a Polaris slide to Bogies.
MOTOR: 16.5 HP or less. You can swap any motor in any chassis ( i.e. you can swap a Hirth in a 1973 John Deere Cyclone 300 chassis or a Rotax in a Yamaha). NO grinding on ports, heads, etc. NO modifications on any internal parts of the motor. No decreasing of rotating mass. Piston MUST remain stock. Max. overbore is .020 over piston no exceptions. Motor MUST have points style ignition (No CDI’s). MUST run OEM fan. Must run stock OEM rewind.
-The Polaris 250 motor is NOT allowed. They are 18 Hp. Many people have asked…
Engines that are legal will be listed
B.S.E 250 16Hp
CCW 225 12.5hp
Hirth 82R 246cc 12Hp
Hirth 56R 282cc 15Hp
Hirth 55R 300cc 15Hp
Hirth 54R 300cc 15Hp
Hirth 53R 300cc 13Hp
Hirth 52R 300cc 12.5Hp
JLO L292 292cc 14.6Hp
JLO 230 223cc 12.5Hp
Rotax 250,247 12Hp
Rotax 300,302 12-15Hp
Sachs SA280-Sa280A 16Hp
Solo 206 15.5Hp
Solo 209 16.5Hp
CLUTCH
No Aluminum Polaris clutches allowed
No Aftermarket Duster/Commit 94c clutch
You may swap any clutch from any model on any sled. (I.E. running a scorpion clutch on a Rupp or a Skidoo clutch on a SnowJet).
Clutches have to remain stock. NO changing to aluminum or lightening any of the stock components of the clutch, besides normal weights and springs.
NO decreasing of rotating mass.
MUST have a clutch guard.
CARB: Must run an HR carb (diaphragm type) or Smaller with a HR bolt pattern.
EXHAUST & MUFFLER
1973 or older exhaust.
You may run any style of exhaust on any brand you run.
MUST be a can style exhaust.
MAY be reinforced.
NO tuners and no cutting the muffler open.
MUST have a straight diameter head pipe if not OEM (2" max. diameter).
BRAKES
Chain Case
Suspension
Must run original brand suspension, drive sprockets and rear idler assemblies for that brand of snowmobile I.E. no converting a Yamaha to a Skiroule bogie system or Rupp to a Ski Whiz.
You may run OEM aftermarket drive sprockets and wheels if needed.
TRACK
Minimum of 114 inches
MUST be original or OEM stock replacement.
NO conversions (cleat to rubber, rubber to cleat, bogie to slide, etc.).
NO TRACTION PRODUCTS
SKIS
MUST be OEM replacement 26in leaf style ski’s
Elan’s may run their stock style ski’s and leaf springs, nothing else.
NO ski skins or any plastic on the bottom of skis.
NO aluminum skis.
Ski spreaders allowed. Maximum width 2" (Center of spindle shaft to center of ski spring.)
Carbides allowed (Max. height 11/16" from bottom of ski) 4in. Or less .
Hydraulic style shocks only.
NO Gas Shocks on ski’s
The diameter of the spindle may NOT exceed the diameter of the original spindle race.
Spindle race MUST remain in the stock location at the stock angle. (i.e. The spindle race may NOT be cut off to widen the ski stance or change the angle that the spindle rides.)
FUEL TANK
MUST be original or OEM stock replacement in the stock location
NO secondary tanks of any kind allowed.
MUST use non-ethanol gasoline 91 or under octane pump gas
No E-85, alcohol, nitro-methane, or other fuels and additives allowed.
Snowflaps
HANDLE BARS
HOOD
SEAT
YOU MAY
Change gear ratio
The running boards must remain original but you may remove the stirrups.
Chassis, skis, handlebars, and exhaust may be reinforced.
