1. All general rules apply.

2. Aftermarket finned one piece blocks is allowed.

3. 16hp or less .060 overbore maximum, stock stroke.

4. Stock appearing carburetor. (1.200 Maximum)

5. Any cam, any head, any valves.

6. Single cylinder, flat head, four stroke must maintain factory deck height. Stock crank, cam and valve locations.

7. Kohler block must maintain a cast iron intake runner.

8. Must have a steel flywheel.

9. No external modifications to the block.

10. Ram tubes, three inch maximum allowed.

11. Must run on alcohol.

12. Shielding: 1/8 inch steel ¼ inch aluminum. Shielding will run from the bottom of the cylinder to the bottom of the crankcase on both sides. On the front and rear on cross mounted motors. Shields must be bolted to the frame.

13. Tires not to exceed 26x12x12.

14. Professional tires allowed.

15. All heads must be strapped with a permanently mounted metal bar.