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STOCK SNOWMOBILE REGULATIONS
The snowmobile must have original OEM engine, hood, intake, exhaust, frame, track,
suspension, cowl, fuel tank and drive components. Named components must be of same model
and year, or properly filed OEM replacement parts.
SLED EQUIPMENT
Engine
1. All engines will have an OEM tags and/or serial numbers affixed to the engines.
2. No component of the engine may be altered, changed or enlarged from the engine
manufacturer's original Stock specifications, nor may any additional components be added
to the engine. Blueprinting will not be allowed. No removal of material will be allowed.
This is to include, but not be limited to polishing, port matching, deburring, acid, glass
or sand blasting surfaces or material removal for the purposes of engine balancing or
other reasons.
3. Maximum cylinder overbore for wear or cylinder repair cannot exceed .020 inch (0.50mm).
4. Stock OEM pistons only are allowed for replacement.
5. There will be no more then one cylinder base gasket to a cylinder. No changes in engine
dimension can be made by gasket adjustment.
6. Rotary valve timing/duration must remain as filed by the manufacturer.
7. OEM carburetor slide valves and replacement jet options will be allowed without
modification.
8. An adequate return spring on the throttle is required.
9. Choke mounting location may be moved for driver comfort. Choke system may be
disconnected.
10. No pressure charging allowed.
11. The engine air intake system is to include any; cowl vents, air box, noise reducing
foam (cowl vents & air box), carb boots, carburetor's, clamps, rotary valves,
carburetor flanges, and oil injection nozzles that are original OEM equipment for that
make and model. No changes or modifications will be allowed to any part of the engine air
intake system or mounting locations.
12. Deep snow cover/foam must remain in place.
13. Engine must remain in original mounting location. 14. No pressurization of fuel tanks
or lines allowed.
15. Fuel lines must be free of obstructions by other machine components.
16. No additional engine cooling systems allowed.
17. Oil injection system and all associated components must be installed but may be
disconnected. All components of the oil injection system must be installed in their OEM
configuration. The oil pump must be functional and deliver oil to the engine. The oil pump
operating cable may be adjusted and/or disconnected so that oil pump output will be at the
"closed throttle" configuration. Premixed oil and fuel may be used to supplement
the output from the oil pump.
18. Spark plugs do not have to be OEM.
19. No changes or modifications will be allowed to any part of the exhaust system or
mounting locations.
20. 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.
DRIVE
1. Must have original OEM variable speed converters supplied by the manufacturer for that
make and model. Factory designated replacements must be submitted to ISR Race Rules
Committee for approval and implementation.
2. In the primary clutch any combination of any springs, weights, ramps, etc., may be used
(no RPM limit). Metal may be removed, but not added by welding to ramps or flyweights. In
the driven clutch, any springs and helixes may be used. Helixes may be machined for angle
change. No material may be added. No welding will be allowed (Billet Helixes allowed). No
machining on clutches to accommodate springs, weights, or helixes. No modifications will
be allowed to either faces of the drive or driven clutches.
3. Drive belts do not have to be OEM.
4. Chain case must be original OEM for model and equipment. Must remain in original
mounting location. Any drive chain and sprockets may be used. Chain tensioner may be
changed to any OEM equipment.
5. Track drive shaft and sprockets must be OEM for the model drive. Sprocket may be trued
round.
6. Brakes must remain OEM for the model. No dual brakes. No mechanical brakes allowed.
Existing vents may be used to direct cooling to the braking mechanism but disc may NOT
extend more than one (1) inch beyond vent surface. Brake disc must be steel and
commercially available (no carbon fiber or composite material brake discs allowed). No
additional drilling on a commercially available brake disc. Brake control handle must
remain in OEM location (left side).
SKI SUSPENSION & STEERING
1. A maximum sled/chassis width will be 43.5 inches measured from one ski carbide
cutting edge to the opposite ski carbide edge.
2. No substitution of material allowed on front suspension. Must remain in original
mounting location, in both bulkhead and spindle housing.
3. Sleds must remain stock width.
4. Swaybar must remain in OEM location, but does not have to be functional. Swaybars must
be OEM but may be interchanged with other stock models offered by the manufacturer.
5. Limiting devices of any length may be used. A minimum of two (2) inches travel,
measured from the lowest part of the belly pan to flat ground surface with the driver on
the sled must be maintained.
6. Reinforcement of components will be allowed by welding or bracing. Structural integrity
must be maintained.
7. Spindles may not be shortened or altered.
8. Any spring may be used on the suspension. May be shortened or heated.
9. Any shock absorber, fluid, gas (non-flammable), or fluid metering valves may be used.
May be shortened OEM length for make and model must not be exceeded.
10. Handlebars must be intact at the start of each race day. Any commercially available
handlebars allowed. May be altered to fit the driver. Open ends must be capped. Handlebars
must be padded. Column or post must remain in its OEM position. Grips and controls may be
changed or modified. Throttle must be operated with a thumb mechanism located on the
handlebar to the rear of the machine (no twist grips).
SKIS & SKI RUNNERS
1. After market skis allowed. Skis must be commercially available and marketed thru normal
sales activity, must meet ski diagram in the appendix.
2. Skis may not be interchanged between brands.
3. May reinforce skis on the top side only.
4. Must have ski loop as per dimension of appendix. Ski loops must be secured by means of
bolts or welding. Ski loops must be in place at the start of the race. Metallic ski loop
leading edges not one (1) inch in diameter must be padded. Any ski edge with over 1/2 inch
turndown is a legal cutting edge.
5. Ski skins allowed.
6. Maximum ten (10) inch turning material per ski. Turning material must be continuous.
7. Carbide turning material may be altered to an angle of not less than sixty (60) degrees
inside included angle. No grinding or machining allowed.
8. Wear bars including carbide insert must not exceed 5/8 inch width and 5/8 inch depth
from the lowest point of the ski. 9. 3/8 inch is wearbar minimum width.
TRACK SUSPENSION
1. Suspension must be OEM for the make and model. Must remain in original mounting
location or optional locations predrilled in backing plate by the manufacturer. Suspension
components must remain in original location or optional locations filed by the
manufacturer. No substitution of material allowed.
2. Rails may not be bent or shortened.
3. Wheels (idler and marginal snow) may be added or removed along with mounting brackets
from an OEM wheel kit. Wheel diameters may be trued round.
4. Slide rail lubrication will not be allowed.
5. Any hyfax allowed.
6. Any shock absorber, fluid, gas (non-flammable), or fluid metering valves may be used.
May be shortened, OEM length must not be exceeded.
7. Any spring may be used on suspension.
8. Springs may be shortened or heated.
TRACK & TRACTION
1. A factory designated replacement track or the original OEM track for the year and model
will both be legal for competition and must remain as manufactured. No trimming or shaving
of the track grouser bars, rubber studs/ snow lugs will be allowed. If the factory
designated track or the original track is not available to the driver (not in inventory)
within five (5) days the track will be banned from racing.NOTICE: Effective 6-1-01, any
commercially available one piece. molded rubber track may be used. If a particular track
is not available to a driver (not in inventory) within five (5) working days of the
receipt of the order, the track will be banned from racing until the order becomes
available. No modification, trimming, cutting, slicing, shaving or narrowing is allowed.
2. No cleats or partial cleats may be added.
3. Grouser bars and rubber snow lugs must remain OEM height and width.
4. Any commercially available guide clips may be added or removed. No traction devices may
be added to track clips.
5. Tracks may be reversed.
6. Studs cannot be more than 3/8 inches above the highest point of the track.
7. All machines are limited to ninety-six (96) sixty (60) degree single point studs in the
track. No Pyramid style traction devices allowed.
8. Must be single point stud.
9. No sharpening allowed. No modification allowed. No machining allowed.
10. Must be commercially available.
11. Stud backing plate cannot be over two (2) inches in width and length.
12. Backing plates may not extend beyond the height of the rib and must rest against the
rib. No sharpening (vertically or horizontally) of the backing plate.
13. All components of the traction devices must be located in the center of the track
between the inside edges of the two slide runners (hyfax) and a minimum of 3.75" from
the edge of the track.
14. No grass hooks or paddles allowed.
15. Studs may not be placed over part numbers and part numbers may not be removed.
FRAME & BODY
1. All chassis will have OEM tags and/or serial numbers affixed to the frame.
2. Reinforcing by welding and/or bracing will be allowed.
3.Removal of any material from total machine by means of heat, acid, drilling, grinding,
sand blasting, peening, substitution, or total elimination will not be allowed.
4. A maximum sled/chassis width will be 43.5 inches measured from one ski carbide cutting
edge to the opposite ski carbide edge.
5. Access openings will be allowed for component removal or service but closures must be
made of original type materials. Vents/scoops must be OEM for the model. Vents may be
covered or closed. No additional vents or scoops may be added. Crankcase and/or brake
cooling ducts must remain within the confines of the sled and only use an existing vent.
6. Hoods may not be removed.
7. Windshield does not have to be OEM, but must be equal to OEM windshield in dimensions
and mounted in OEM location as filed. Minimum stock windshield height must be maintained.
Must have a safety edging. Windshield may be altered for handlebar movement. Must be
intact at the start of each race day.
8. Seat must be OEM for make and model. Padding may be added or removed to improve driver
comfort and safety. May be lowered but must be at least five (5) inches thick at its
minimum dimension. Height will be measured from top of original tunnel to top of seat in
riderless state. Must be upholstered. May not be moved from original mounting location.
9. Insulation may not be removed.
10. Skid plates may be added for protection of sled bottoms. Skid plates must be securely
fastened. Must be commercially available.
11. Additional plate material may be added to the tunnel at the suspension mounting holes.
12. Tunnel protective wear strips may be added, removed or altered.
13. Bumpers may be added, removed or relocated and not be a safety hazard.
14. Fuel tank must be OEM as supplied with the machine or opaque (translucent) as supplied
by the OEM manufacturer. The translucent tank must be of equal dimensions and capacity to
that supplied by the original OEM manufacturer. OEM fuel tank is the only tank that can be
used to supply fuel to the engine.
15. Fuel lines must be free of obstruction by other machine components.
16. Dulled foot traction devises allowed on the running boards.
a. on the flat of the running board: traction devises must be dulled and be no higher than 1/2 inch above the flat of the base of the traction device.
b. ON THE TOP OF THE ROLLED EDGE: Traction devices must be dulled and be no higher than 1/4 inch above the top of the rolled edge of the running board.
c. The traction device may extend a maximum of 1/4 inch beyond the side of the rolled edge for the purpose of mounting. There shall be no sharp edges to the side of the rolled edge.
17. The rear snow flap must be in contact with the course surface when driver is seated. The use of elastic material to restrain the rearward movement of the snow flap is acceptable.
IGNITION & ELECTRICAL
1. All machines must be equipped with a safety disconnection (tether) and be operable at
all times. This will be the responsibility of the driver. Tethers must be used and
attached to the operator whenever the engine is running, this includes pit ares, staging
and race course.
2. Maximum tether cord length will be five (5) feet. Verification of tether cord length
will be determined at tether cords fully extended length.
3. The tether cord will be securely fastened to the driver. No alligator clips are
allowed.
4. The tether switch will be securely mounted in a location on the snowmobile other than
on the handlebars.
5. Battery operated electric fuel pumps must be connected to the tether switch. This
includes electrically controlled fuel injection systems.
6. Wet cell must be enclosed in a non-conductive battery box. Positive terminal must be
shielded. Battery box must be securely held in place.
7. A functional kill switch that will terminate ignition if the sled rolls over, this is
in addition to the tether switch.
8. Wiring may be removed.
9. Instrumentation may be added but must not provide a safety hazard. May be disconnected
but not removed.
10. Head and tail lights must be original OEM equipment. Must be taped over with
transparent clear tape. Must remain in original mounting location. Must be operational at
the start of the race. Tail light cannot be battery operated.
LEGAL FUEL REGULATIONS
1. A contestant appealing a fuel disqualification must bear the expense of the fuel
analysis and handling.
2. Only an approved commercially available pump gasoline will be legal. The gasoline may
be mixed with petroleum, organic, vegetable, or chemical base lubricants. The use of oils,
fuels including gasohol, and additives providing power boosting characteristics are
strictly forbidden. Gasoline is a good electrical insulator, or dielectric, and its
relative effectiveness as an insulator is represented by it D.C. The average D.C. for the
hydrocarbons which comprise gasoline is 2.025. This is defined as a reading of zero (0)
with the Fuel Check meter. To compensate for possible temperature differences of gasoline
(which cause slight variations of the D.C.), the acceptable range of the meter reading.
PRE-RACE SAFETY INSPECTION
1. Pre-race safety inspections are mandatory at all races. Pre-race inspections do not
certify that the machine is qualified or constituted as legal for class participation.
Post-race technical inspections determine machine qualification.
2. All aspects of modification are contingent on safety inspection by the Technical
Director. The Technical Director may remove any sled from competition that does not meet
safety requirements.
3. Damaged or broken safety equipment (not including tether switch) not detected during a
race is not grounds for disqualification after completion of that race unless black
flagged during the race in question.
MANDATORY TEARDOWN
1. Tech Director will select the machines for mandatory teardown and inspections. Sled's
driver will be notified at the completion of race if he/she is to report to teardown.
2. Any driver refusing teardown will be disqualified.
3. Driver and/or driver's mechanic will perform tear-down to point required by the
Technical Director.
4. Inspected machines will not be reassembled by the inspection group.
5. Driver and/or driver's mechanic will be the only two (2) people allowed with the
machine in the inspection area.
6. The sanctioning organization assumes no responsibility for impounded sleds.
SEALS
1. Drivers will allow the installation of a seal or seals on the engine and/or body of
their racing machines. To change the seal, mutilate it or try to break it, or re-use it,
during the weekend or event where it is installed without the consent of the Race
Director, could result in the responsible driver being called before the disciplinary
committee for strict discipline. Accidental breakage of the seal must be reported to the
Race Director immediately.
PROTESTS
1. All formal protests must be made in writing, by a racer in competition at the event,
from the class in question, on a formal protest form (available at race headquarters)
accompanied by a $100 cash protest fee.
2. When the official protest is made with the fee, teardown will not be complete until
protest is satisfied or proven unwarranted. If the protest is valid, the fee will be
returned to the protester. If protest is invalid, the fee will be given to the protested
machine owner for the inconvenience. To be accomplished before the machines are released
from teardown.
3. There is no need for formal protests in the case of driving infractions during an
event. Reports of such alleged infractions should be made to the Race Director, who in
turn will request a report from the flagman or assigned official on the course.
4. A protest must be valid in the eyes of the Race Director, or he has the option not to
accept it for action.
5. No protests will be accepted that refer to a Race/Technical Director's judgement or
decision.
6. It shall not be possible to protest or appeal technical inspection equipment, scoring
or timing equipment.
7. No protests will be accepted after thirty (30) minutes following the completion of the
daily event.
8. No protests, grievances, etc., will be accepted thirty (30) minutes after the posting
of the affected class.
ENFORCEMENT, DISCIPLINE AND VIOLATIONS EJECTION FROM
RACE SITE
1. The Race Director has the right to eject any person(s) from the pit, paddock (staging
area) or race track area.
CONDUCT OF PARTICIPANT (OFFICIALS, DRIVERS, CREWS, ETC.)
1. Vulgarity, derogatory or offensive language will result in disciplinary action,
ejection from race site and be subject to fines and penalties.
2. Any participant that threatens bodily harm or assaults any official, driver, crew,
etc., will be subject to disciplinary action, ejection from race site and be subject to
fines and penalties.
DRIVER LIABILITY
1. The driver/pit crew, in signing the entry, elects to use the course of the event at
driverŐs/pit crews own risk, and thereby releases the sanctioning organization together
with their heirs, assigns, officers, representatives, agents, employees, and members,
sponsoring organization and owners of properties on which sanctioned events are to be held
from all liability from injury to person, property may be received by said entrant and
from all claims of said injuries to the parties listed above growing out of, or caused by
any construction or condition of the course over which the event is held.
DRIVER RESPONSIBILITY PIT CREW
1. Members of pit crew, etc., are the responsibility of the driver to whom assigned. If a
crew member becomes a problem, the racer whom they are with, can be disqualified.
BAD CHECKS & CREDIT CARDS
1. Any competitor who issues a check that is invalid or returned for insufficient funds,
or the equivalent, or who stops payment on said check that has been issued for race entry
or membership fees will receive an automatic suspension of one year from the date that the
check has been made good.
2. If a competitors credit card is declined once, they will not longer be able to use a
credit card as payment with WSA. A Cashiers Check or cash only will be accepted.
SLED REQUIREMENTS
1. The condition of a machine is the responsibility of the driver. A driver may be
disciplined if driver's machine is modified so as to defraud the officials or other
competitors.
FRAUD, BRIBERY & ILLEGAL ASSISTANCE
1. In addition to non-compliance with any of the above regulations or rules, the following
offenses shall be considered a breach of regulations subject to disqualification.
a. Bribing or attempting to bribe anyone connected with the race; accepting or offering to accept a bribe.
b. Competitor accepting any kind of assistance that aids in machine operation during the race.
c. Any fraudulent proceedings or act of prejudicing the interest of the race generally.
SNO-CROSS TECHNICAL VIOLATIONS:
1. Running without a hood or shroud in position.
2. Running with altered numbers.
3. Running with bibs not in position.
4. Receiving unauthorized assistance.
5. The driver, group of drivers or any pit crew members attempt to harass race officials,
in any manner.
6. Course cutting.
7. Failure to stop for Post Race Technical Inspection.
8. Failure to use proper safety equipment.
9. Allowing non registered drivers to operate drivers sled on track during a practice lap
or during race.
10. Running without helmet strapped.
11. In the event of a driver becoming dislodged from his sled or a crash and the engine
continues to run or the safety disconnect switch fails to function or is not properly
fastened/attached to the driver while the engine is running the driver will be
disqualified from the heat that the infraction occurred. See page five for technical
penalties.
DRIVER MAY BE PENALIZED AT START OF RACE FOR THE
FOLLOWING:
1. Jumping the start.
2. Causing a restart.
COURSE REQUIREMENTS COURSE DESCRIPTION
1. The course shall be marked adequately and safely.
2. The narrowest part of the track will govern the number of machines to start at one
time. Track width will determine the number of machines on the track. Five (5) feet of
track width per machine will be considered a standard requirement for events.
3. Barbed wire or unmarked stumps, rocks, or other hazards shall not be found within forty
(40) feet of the race course.
4. The Finish Line banner must have a minimum ground clearance of ten (10) feet to the
bottom of the Finish Line banner, and twenty five (25) feet between supports.
5. The course shall be checked before the race can be started and any discrepancies found
shall be corrected.