CHAMP RULES
Champ class rules (with the exception of weight and safety rules) are frozen through the 2010 season. The next opportunity for review and change of the class is at the 2010 rules meeting.
GENERAL RULES
1. Only single track snowmobiles allowed.
2. Any changes or alterations in the stock classes are allowed.
3. The brand of engine, hood and logo need not match.
4. All sleds must comply with GENERAL RULES AND REGULATIONS section.
5. Snowmobiles must weigh a minimum of 375 lbs. 575lbs with driver.
6. Ballast may be added to equalize weight. Ballast must be securely contained.
7. Maximum overall width is 45 inches.
ENGINE
1. The designated engine must originate from a stock qualified 1995 or newer two cylinder snowmobile. The displacement of the stock qualified engine must be no more than 440cc (as produced and filed by the manufacturer).
2. The cylinders must be located on the engine, with the intake and the exhaust ports in OEM/stock orientation to the crankcase.
3. Engine stroke may nor be changed or altered.
4. Engine oil injection pump may be removed.
5. The following OEM/stock engine components may be modified, but the OEM/stock quantity of cylinders must be maintained.
a. Crankcase
b. Crankshaft- no stroke change.
c. Cylinders- may overbore not to exceed class displacement limit (440cc).
d. Cylinder heads- sparkplug quantity and location must remain OEM for the engine.
6. The following OEM/stock components may be modified or replaced.
a. Bearings
b. Connecting rods-must maintain OEM/stock center to center distance.
c. Pistons.
d. Rings.
e. Pins.
f. Gaskets.
g. Intake and exhaust flanges and manifolds.
h. Rotary and reed valves.
i. Additional fuel pumps may be added.
j. Exhaust valves (if OEM for the model).
k. Water pump housing or cooling fan housing may be altered, removed or replaced.
l. Engine mounting plate and brackets may be altered removed or replaced.
m. Rubber isolation mounts.
7. Mikuni VM 34 round slides carburetors only (34.1mm maximum bore size). Only one carburetor per cylinder.
a. If the 440cc stock qualified snowmobile engine was produced with carburetors larger than 34mm, the engine may be used with the larger carburetors only in combination with the stock qualified chassis. The snowmobile will be allowed to compete. But it must conform to ALL the rules in the STOCK CLASS.
b. No smooth bore, flat slide or taper bore carburetors allowed.
c. No internal changes to the carburetor body allowed.
d. No modification of a carburetor bore (venturi) allowed.
e. Out side diameter of outlet spigot may be increased.
f. Cut off straight portion of inlet.
g. Air box, filter, tapered bell may be added to the inlet end of carburetor.
h. Power jet carburetors and power jet carburetors kits are not allowed unless OEM for the model of engine.
i. Butterfly throttle valve carburetors are not allowed unless OEM for the model engine.
j. Larger than specified carburetors may not be downsized to meet these rules.
k. Unless otherwise specified, the only carburetor changes allowed will be replacement of tuning parts. Modifications not allowed to tuning parts.
8. No fuel injection or pressure charging is allowed.
9. The intake concept may be changed (i.e. from reed to rotary valve or from piston port to reed).
10. Intake systems that allow more than one (1) cylinder to receive air from a carburetor are allowed only if system is used on a stock qualified model from the same OEM manufacturer. Except for mounting, the system must be used without modification.
11. Air box may be removed or replaced.
12. OEM cooling concept must be maintained.
13. Engine torque arms, limiters, snubbers, and suppressors may be used.
14. All sleds are required to have a functionally silenced exhaust system. Exhaust system must not protrude more than three (3) inches outside the hood chassis.
DRIVE
1. Any commercially available drive and driven clutches and internal components may be used. Clutches and components may be modified.
2. Chain case and internal components may be removed or replaced. Chains and sprockets may be alterd, removed or replaced.
3. Jack shaft/track shaft may be altered removed or replaced.
SKI SUSPENSION & STEERING
1. Front suspension components (arms, spindles, rod ends, spherical joints, the rod linkages, IFS trailing arms and radius rods) may be altered or replaced.
2. Front suspension springs may be altered or replaced.
3. Sway bars and links may be altered, removed or replaced.
4. Shocks and TSS struts may be altered, removed or replaced.
5. Sleds must maintain two (2) inches of useable vertical suspension travel.
6. Handle bars, columns and controls may be altered or replaced. Aluminum handle bars allowed if produced by the OEM manufacturer.
SKI & SKI RUNNERS
1. Skis may be altered or replaced.
TRACK SUSPENSION
1. No cleated tracks allowed. Track must be commercially available, one-piece molded rubber track. Track must be used as produced by the molder of the track. No modifications allowed unless specified.
2. Minimum width is 13.5 inches. Minimum length of track is 103 inches. Minimum lug height is ½ inch.
3. Track must be “R” rated from the molder. It is recommended that the track be no more than 3 yrs old.
FRAME & BODY
1. Chassis/frame origination and modification are not limited or restricted. Maximum width is 45 inches.
2. Any hood allowed. May be cut out behind the windshield for additional venting. Headlight fairing or cowling may be removed. Dash and/or console may be altered, removed or replaced.
3. Windshield not required.
4. Fuel tanks may be altered or replaced.
5. Seat may be altered or replaced.
6. No radiator may protrude from or thru the hood or chassis.
7. Heat exchanges may be mounted on the front and bottom surfaces of the belly pan if mounted flush to the pan.
IGNITION & ELECTRICAL
1. Ignition system (CDI box, flywheel, and stator) must be OEM for the model engine. No modification allowed.
2. Ignition high-tension coil may be modified or replaced.
3. An OEM production taillight, with the brake element on whenever the engine is running is mandatory.
4. Instruments, gauges and headlights may be altered, removed or replaced.
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