2. Stock carburetors may be reworked. OEM accelerator pump carburetor is allowed. OEM Kohler 2-barrel carb and recast 1.2 stock appearing carb are allowed. No other types of carburetors allowed. Maximum one (1) carb allowed. No turbos or pressurized intakes.
added for 2010
4. No reverse port engines allowed. Manifolds and carburetor must go to the original stock ports.
updated for 2010
3. Stock heads may be reworked, but recast or aftermarket heads are not allowed. Porting and polishing allowed. No external welding or other external modifications allowed. Must use stock intake and exhaust bolt pattern and location.
4. Aftermarket cams, pushrods, valve springs and solid lifters allowed. Roller lifters and roller rockers are allowed.
5. Engine must have been available in a lawn or garden tractor from an oem manufacturer not to exceed any other rules such as horsepower, cubic inch, cylinders, or class size rules, etc., and must be oem stock production garden tractor engine. Aftermarket blocks are not allowed. It is up to the tractor owner to provide documentation to prove eligibility, such as oem tractor manufacturer, tractor model, and engine specs such as cylinders, cubic inch, and horsepower rating.
6. No rpm limit but steel flywheels are REQUIRED.
7. Engines must run gasoline, E10, E85, E99, racing gas or methanol only; no additives. Driver must wear full fire suit if tractor is on methanol.
8. Straight pipes and chrome air cleaners allowed.
9. Must run a factory appearing hood and grill, use garden tractor rear-ends and stock garden tractor frames that are factory length with a maximum wheelbase length of 52 inches.
10. May strengthen drive train to prevent breakage. (Reared, driveshaft, clutch, etc.) Altering gear ratios is allowed.
11. Bar tires and professionally made pulling tires such as Cepeks, Pit Bulls, Lawntecs, etc are allowed. May sharpen bars tires. Adding of bars, such as double cutting, is allowed.
12. Rear tire size: 26 x 12 x 12 maximum.
13. Aluminum wheels are allowed.
14. Clutch covers and flywheel shields are required. Minimum thickness 1/8 inch steel or 3/16 inch aluminum.
15. Driveshafts must have a support bearing in the center or driveshaft loop.
16. Engine must shielded by 1/8 inch steel or 3/16 inch aluminum on external side of cylinder extending from head gasket to frame. Shield must be attached to frame at the bottom and to flywheel shield at the top to make rigid.
17. Engines must have a hold down restraint installed to prevent the cylinder and head from separating from the block.
18. Bumper bars are required. These are a vertical bar at least 6" long mounted on rear most part of wheelie bars. Vertical bumper bar must be even with or behind back face of wheelie wheel or skid.
19. Tractors must have WORKING kill switch fastened to the rear of the tractor in such a way that it does NOT interfere with weights or sled hitching device. The connector must be fitted with a ring with a minimum of 1.5" inside diameter.
20. A minimum 1 1/2 pound dry chemical working fire extinguisher or equivalent. A gauge on the fire extinguisher is required or an inspection and recharge tag not more than two years old. They can either be dry chemical or CO/2-type extinguishers.
21. Tractors must have deadman throttle with return springs on the pedal and the carburetor.
22. Drivers must wear helmets that meet minimum Snell 95 requirements. No football, baseball or toy helmets.
23. Drivers must wear long pants and boots. No sandals or open toes.
24. Minimum age to drive in this class is fifteen (15) years old and must be physically capable of being in full control of the tractor at all times.
25. Tractors conforming to the Missouri Super Stock class rules may pull in this class but are still subject to our minimum age requirements.