900 Lbs. 12 H.P. Stock Altered:
Contest open to riding lawn and garden tractors. Standard lawn mower type engines and carburetors only. Tractors must be stock in appearance. 30 c.i. maximum displacement for single cylinder flatheads. 25 c.i. maximum displacement for single cylinder OHV. Maximum carburetor venturi size is 1.130 inch. Governors are optional. Porting and Polishing is allowed. Heads and block may be milled. Camshafts may be re-ground. Only standard lawn mower parts may be used. No after market intakes, and heads. Any type of tractor tire may be used in this class. Any tread pattern can be used. Transaxles may be locked. Maximum over-bore is 0.045.
