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120/4 STROKE RACING
Drivers - Girls and Boys ages 6 through 12
Snowmobiles - Arctic Cat Z 120, Bombardier Mini Z, Polaris XCR 120
GENERAL COMPETITION & SAFETY RULES
1. Kitty Cats and 120/4 sleds do not compete against each other.
2. In the event that a driver is off his/her machine after an accident involving two or
more sleds, the race will be red flagged.
3. Driver entry is open to any qualified individual. WSA has the authority and
responsibility to evaluate all drivers to determine their qualifications.
4. Both the owner of the sled and the driver are responsible to ensure that their
snowmobile and driver safety equipment conform to all of the rules for the class in which
they have entered. The applicable rules are published in this chapter, in the general
section (SLED/EQUIPMENT REQUIREMENTS & REGULATIONS) Any driver that does not meet the
requirements listed will be subject to disqualification and forfeiture of any prizes or
awards, plus eligibility for the next two (2) races.
6. Mandatory teardown and inspection of first place sleds.
7. If it isn't stated in this section that it can be done, consider that it cannot be
done.
DRIVER SAFETY EQUIPEMENT
1. Helmets, upper body protection, shin guards, and above ankle boots required in all
classes.
2. Mouth guard is mandatory.
3. See General competition rules, driver safety equipment for details.
The intent of these rules is to establish a venue in which all qualified drivers and snowmobiles can compete at their own level. These rules are definitions and guidelines for allowable modifications or alterations. If a definition, modification or alteration is not cited, then it is to be construed that no modification, alteration or change can be made to the component unless it is specifically approved by the rules committee.
STOCK CLASS120/4 RULES
The snowmobile must have original OEM (or factory designated replacement) engine, hood,
track, skis, frame, cowl, gas tank, carburetion, air box, suspension and clutch supplied
by the manufacturer of the particular model. Factory designated replacements allowed.
ENGINE
1. Governor must be intact but does not have to be operational.
2. No component of the engine (including head, valves, cam and valve springs) may be
altered, changed or enlarged from the engine.
3. Blueprinting of the engine is not allowed. No removal of material whatsoever will be
allowed. This is to include polishing, port matching, deburring, glass or sand blasting
surfaces or material removal for the purpose of engine balancing or other reasons.
4. There will be no more then one cylinder base gasket to a cylinder. No changes in engine
dimensions can be made by gasket adjustments.
5. The OEM exhaust system for the model must be used in its entirety. The exhaust system
must be fully contained within the confines of the cowl or the chassis and direct exhaust
emissions from the enclosed area. Muffler components and/or silencing materials must be
intact at all times.
6. Spark plugs do not necessarily have to be OEM stock.
7. No carburetor/air silencer changes allowed.
8. Jetting changes are allowed.
9. Engine RPM and vehicle speed may be monitored at the discretion of the Race Director.
DRIVE
1. Bake must be functional and operational at all times.
2. OEM drive clutch must be used with no modifications.
3. Stock drive clutch engagement must be maintained.
4. No belt drives allowed.
5. Chain guards must be in place.
6. OEM guard must be in place.
7. WSA have the option to review and change gear ratio rules to maintain fair competition.
SKI SUSPENSION & STEERING
1. Front suspension must be OEM stock.
2. Front suspension must remain in its stock position.
3. Ski widening devices and/or height adjustment devises are not allowed unless furnished
as OEM and properly filed.
4. Suspension travel may be limited by means of limit straps only. Minimal suspension
travel must be maintained. No rigid suspensions allowed.
SKIS & SKI RUNNERS
1. Ski must be OEM for the model and year or a commercially available aftermarket ski with
a minimum overall length of 20 inches.
2. Ski suspension components must be OEM.
3. Ski tips must have ski loops. Steel ski loops must be padded.
TRACK SUSPENSION
1. The complete suspension must be used as furnished and filed by the manufacturer.
2. Commercially available marginal snow wheels may be added to the slide rails. (Rear
axle idler wheels must remain OEM for the model)
3. Suspension travel may be limited by means of limit straps only. Minimal suspension
travel must be maintained, No ridged suspensions allowed.
TRACK & TRACTION
1. The track must be OEM for the model.
2. Maximum two (2) traction points per track segment. (All other traction rules for
snocross racing apply.)
FRAME & BODY
1. OEM hoods only. OEM hood may be painted any color.
2. Windshield may be trimmed. Exposed edges of windshield must have safety bead.
3. Front and rear bumpers must be padded.
4. All sharp edges must be padded.
IGNITION & ELECTRICAL
1. An ignition tether switch must be installed and functional.
2. Headlight and tail light must be OEM stock and remain functional.
NO EXPRESS OR IMPLIED WARRANTY OR SAFETY WILL RESULT FROM PUBLICATION OF OR COMPLIANCE WITH THESE RULES AND REGULATIONS. THEY ARE INTENDED AS A GUIDE FOR THE CONDUCT OF THE SPORT AND ARE IN NO WAY A GUARANTEE AGAINST INJURY OR DEATH TO SPECTATORS OR PARTICIPANTS.