Engine

1. Any OEM Kitty Cat engine may be used as long as an original cylinder and crankcase is used.
2. Engine components must retain original OEM part numbers.
3. Engine displacement may not exceed manufacturers filed specifications for stock. Cylinder may be bored to a maximum of .020 inch (0.5 mm) or .040 inch (1 mm).
4. Engine components allowable for modification must begin with stock components, must retain original number of cylinders
   1. Cylinder
   2. Cylinder head
   3. Crankshaft
   4. Bearings
   5. Rods
   6. Pistons, piston pins and rings
   7. Gaskets
5. Additional main bearing may be added to magneto side of crankshaft. Additional support for added bearing allowed.
   
6. No liquid cooling may be added.
7. No reed valves may be added.
8. No external crankcase modifications allowed. Except to add fuel pump pulse fitting.
9. Rods center to center must remain the same.
10. OEM stroke must remain the same.
11. Carburetor may be modified or replaced.
12. Fuel injection or turbo chargers not allowed.
13. Additional? fuel pumps may be added. Pulse fitting may be added to crankcase to operate fuel pump.
14. Recoil started cup must be in place.
15. Any exhaust modification or replacement is allowed, with the exception of megaphones. The exhaust system must be functionally silenced. The exhaust emission pipe must not protrude more than three (3) inches beyond the chassis or hood configuration. The exhaust pipe must exit downward and extend below the plane of the top of the tunnel.

Drive

1. Chain guard is required.
2. Chain guard must cover all rotating components.
3. Clutch and drive system may be modified or replaced. CVT system allowed. Components must be commercially available.
4. Conventional OEM style drivers are required.
5. Brakes system may be replaced. Brake system must be functional at all times.

Ski Suspension and Steering

1. May be altered.
2. Handlebars may be changed and or modified. Material strength must meet or exceed OEM handlebar material. Must structural integrity and safe configuration. Structural integrity and safe configuration are at the discretion of the Race Director.

Ski and Ski Runners

1. Skis may be changed to commercially available after market skis.
   1. Sno-cross minimum length 20 in.
   2. Oval and Ice Drag minimum length 12 in. minimum width 2.75 in.
   3. Minimum width and turn-up for Oval and Ice Drag are as shown in illustration.
2. Ski loop must conform to General Rules and Regulations.
3. Ski runners must meet competition and safety requirements for the type of racing (i.e. Oval or Sno-cross).
   

Track Suspension

1. May be altered.

Track and Traction

1. Twin tracks are not allowed.
2. Conventional style tracks and drives are required.
3. Any traction products are allowed but must meet Kitty Cat General Tract and Traction Rules.

Frame and Body

1. Must begin with a stock tunnel.
2. Chassis may be altered as long as it doesn't interfere with the safety of the operator or other drivers.
3. Overall sled length may not exceed sixty (60) inches. Measurements will be from the rear of the tunnel (Excluding snow flap and lifting handle) to the tip of the skis.
4. Snowmobile may not exceed thirty (30) inches in width.
5. Snow flap must touch ground with rider seated.
6. Any hood allowed.
   

Ignition and Electrical

1. Ignition may be modified or replaced.
2. Gel cell and dry cell etc. batteries will be allowed. Conventional lead/acid wet cell batteries are not allowed.