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2010/2011 Rules changes coming soon!! 120/4 STROKE RACING NOTICE: The 120/4 stroke rules will be reviewed annually. CLASSES The intent of these classes is to establish races in which all can compete at their level of personal and equipment ability. The class structure is organized in such a way as to enable as many snowmobiles as possible a place to successfully compete. If class rules are not followed, the class name shall not be used and the class shall run under specialty classes. Once rules are abridged, the sanction is no longer in effect. All 120/4 Stroke classes are stock based classes. No change or modification is allowed unless specifically allowed by these rules. If these rules do not specifically allow a change or modification, then it must be assumed that the change or modification is not allowed. ELIGIBLE DRIVERS Girls and Boys ages 4-12 ELIGIBLE SNOWMOBILES Arctic Cat Z 120, Z 120 Sno Pro Bombardier Mini Z Polaris XCR 120 GENERAL COMPETITION & SAFETY 1. In the event that a driver is off his/her sled after an accident involving two or more sleds, the race will be red flagged. 2. Driver entry into an event is open to any qualified individual. The sanctioning body has the authority to evaluate all drivers to determine their qualifications. 3. Both the owner and driver are responsible to ensure that their snowmobile and driver safety equipment conform to all of the rule for the class in which they have entered. 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. 4. A driver must compete for a full year in stock classes or be 6 years of age before competing in any other classes. 5. Teardown will be at the discretion of the 120 Race Director. 6. If it isn’t stated in this section that it can be done, consider that it cannot be done. 7. The Race Director and/or Tech Director have the authority to determine structural integrity. 8. While driver is on the course, radio communication between driver and crew is not allowed. 9. Use of hand signals by anyone other than a track official will not be permitted on the track. 10. Maximum speed per age group is as follows: 4-5 year olds – 12 mph 6-7 year olds – 15 mph 8-12 year olds 18 mph 11. Any gear ratio may be used in all classes. MANDATORY DRIVER SAFETY EQUIPMENT 1. Helmet – Mostly orange in color. 2. Eye Protection, either a shield or goggles. 3. Shin Guards and Knee Pads 4. Tek-Vest (Upper body protection) 5. Above ankle Boots 6. Mouth Pieces must be worn. PRIZES AND AWARDS
GENERAL SNOWMOBILE RULES All 120/4 Stroke Classes are stock based classes. In stock based classes, no change or modification can be done to the stock qualified snowmobile unless specially allowed by these rules. If these rules do not specifically allow a change or modification, then it must be assumed that the change or modification is not allowed. 1. (Sno-Cross and Grass Oval) No traction products allowed. 2. Guide clips and/or track clips may be added to the track. 3. Carbide ski runners allowed. 4. Left side of handlebar may be straightened. Structural integrity must be maintained. 5. An extension may be added to the left handlebar. Maximum 3 inches wider, maximum 4 inches down. End must be capped. 7. All metal ski hoops must be padded as well as any separate front and rear bumpers that extend away from the body. 8. A tachometer may be installed. 9. Data acquisition and data acquisition systems allowed. STOCK CLASS RULES 1. The snowmobile must have original OEM (or factory designated replacement) engine, hood, track, frame, cowl, gas tank, carburetion, airbox, suspension and clutch supplies by manufacturer for the particular model. Factory designated replacements allowed. 2. Engine RPM and vehicle speed may be monitored at the discretion of the Race Director. ENGINE 1. All governor parts must be intact, in place, and functional. Any governor spring may be used. 2. Replacing Arctic Cat chain tensioner with commercially available aftermarket tensioner is allowed. No component of the engine (including head, valves, cam, and valve springs) may be altered, changed, or enlarged from the engine manufacturer’s original stock specifications nor may any additional components be added to the engine. 3. Blueprinting of engines 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 than one cylinder base gasket to a cylinder. No changes in engine dimensions can be made by gasket adjustments. 5. Spark plugs do not necessarily have to be OEM stock. 6. No carburetor/air silencer changes allowed. 7. Jetting changes are allowed. 8. Remote adjustable main jet system allowed. 9. The OEM exhaust system for the model must be used in its entirety. The exhaust system must be fully contained with the confines of the cowl or the chassis and direct exhaust emissions from the enclosed area. Muffler components and/or silencing material must be intact at all times. 10. In order to order to equalize performance between the manufacturers’ model the following changes are allowed. a. Ski-Doo racers are allowed to change valve springs to Honda P/N 14751-2Z1-000 b. Arctic Cat 120 racers are allowed to upgrade to the 120 SnoPro kit consisting of valve springs and cam. The kit must be used in its entirety. 11. To enhance durability, plastic governor gears may be removed in classes, which allow governor to be disabled. DRIVE 1. Brake 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 guard must be in place. 6. Any gear ratio may be used. 7. Sprocket ratio changes may be required by circuits in order to equalize performance between the various models. 8. A 35 chain and gears allowed. SKI SUSPENSION & STEERING 1. Front suspension must be OEM stock. 2. Front suspension must remain in its tock location. 3. Ski widening devices and/or height adjustment devices are not allowed in Stock classes 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 & 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. Seals may be removed from bearings in bogie wheels, rear idler wheels and/or rear idler sprockets. 3. Commercially available marginal snow wheels may be added to the slide rails. (Rear axle idler wheels must remain OEM for the model). 4. Suspension travel may be limited by means of limit straps only. Minimal suspension travel must be maintained. No rigid suspensions allowed. 5. Slide rail lubrication systems not allowed. TRACK & TRACTION Any commercially available molded rubber track may be used. Track must fit within frame and suspension without modification to frame, suspension, or drive. Track must be used as produced by the molder. Hyfax allowed. No traction products allowed FRAME & BODY 1. OEM hood must be maintained without modification. OEM hood may be painted any color except orange. 2. Windshield may be removed, modified, or replaced. Windshield must have safety trim. 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 taillight must be OEM for the model and taillight must be functional. 3. Ignition and lighting systems must be OEM for the model. No modifications allowed. Race rules taken from Rock Maple Racing (RMR). 2008. www.rockmaple.com |
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