MIRA
Open 600
GENERAL RULES
1. Any production or hand built snowmobiles allowed.
2. Any changes or alterations allowed in the stock classes are allowed.
3. The brand of engine, hood and logo need not match.
4. All snowmobiles must comply with GENERAL RULES AND REGULATIONS.
5. Maximum overall width is 45 inches.
ENGINE
1. The designated engine must originate from a stock qualified snowmobile. The displacement of the stock qualified engine must be no more than 600cc for two stoke and 1050cc for four stroke (as produced and filed by the manufacturer).
2. The cylinders must be located on the engine with the intake and exhaust ports in the OEM/stock orientation to the crankcase.
3. Engine stroke may not be changed or altered.
4. Engine oil 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 (600 / 1050)
d. Cylinder heads – spark plug quantity and location must remain OEM/stock 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 housings may be altered, removed or replaced.
l. Engine mounting plates and brackets may be altered removed or replaced.
m. Rubber isolation mounts.
7. No super charging, turbo charging or nitrous allowed,
Only normally aspirated engines allowed.
8. Intake systems that allow a cylinder to receive air from more than one carburetor are only allowed if they were produced that way from the manufacturer.
9. Air box may be removed or replaced
10. All sleds are required to have a functionally silenced exhaust system.
DRIVE
1. Any commercially available drive and driven clutch and internal components may be used.
2. Clutches and components may be modified.
3. Jackshaft/track shaft may be modified or replaced.
4. Chain case and internal components may be altered removed or replaced. Chains and sprockets may be altered removed or replaced.
SKI SUSPENSION & STEERING
1. Front suspension components 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 may be altered removed or replaced.
5. Snowmobile must maintain (2) inches of useable vertical travel.
6. Handle bars, column and controls may be altered removed or replaced. Aluminum handle bars allowed only if produced that way from manufacturer.
SKI & SKI RUNNERS
1. Skis may be altered or replaced
TRACK SUSPENSION
1. Track suspension may be altered or replaced.
2. Rear suspension to tunnel mounting locations is not restricted: safety and structural integrity must be maintained.
3. Must maintain two (2) inches of vertical suspension travel with rider sitting on the sled.
TRACK & TRACTION
1. No cleated tracks allowed. Track must be commercially available. One-piece, molded rubber track.
2. Track must be used as produced by the molder of the track. No modification allowed unless specified.
3. Minimum width is 13.5 inches
4. Minimum length is 103 inches
5. Minimum lug height is ½ inch.
6. Track must be an “R” rated track from the molder. It is recommended that the track be no more than 3 years old.
FRAME AND BODY
1. Chassis/frame origination and modification are not limited or restricted.
2. Maximum width is 45 inches.
3. Any hood allowed.
4. Windshield not required.
5. Fuel tanks may be altered or replaced.
6. Seat may be altered or replaced.
7. No radiator may protrude from or thru the hood chassis.
IGNITION & ELECTRICAL
1. Ignition system (CDI box, flywheel, and stator) must be OEM for the model engine. No modifications allowed except programming the CDI box.
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 can altered and replaced.
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