| 2011 Classic modified rules 1. One day membership required at events that apply. 2. Exaust must exit straight up or down (no curved pipes). 3. Gas, diesel or LP only. Gas can be used with a maximum specific gravity of 750. No Alcohol or nitrous oxcide allowed. All tractor may be subject to random fuel checks upon protest. 4. Enhanced electrical systems permitted. 5. No locked rear ends. 6. All tractors equipped with swinging seats must have a positive stor to prevent contact with rear tires. 7. No shifting allowed. 8. Weight classes are 5,200lb and 5,700lb with an allowance of 100lb for roll over structure. 9. Maximum tire size of 18.4-38, cut tires allowed. 10. Any rim width allowed. 11. Wheel base must not exceed 12" longer than factory length. 12. Weights must not exceed rear wheels or extend more than 11 feet forward from the center of rear axle. 13. Hitch: 20X18 hitch- no part of draw bar may extend rearward past point of hook- hitch to be stationary in all directions- no part of hitch to attach above center line of rear axle- tip over bar and draw bar assemblies are not to be attacted-hitch must be easily accessible. 14. Frame and Rear end: Fabricated frames are allowed, but must mantain length and weight of original frame, Rear end must match manufacturer and model series of sheet metal- no locked rear ends. 15. ENGINE: 360 cubic inch limit, no turbochargers or superchargers, 1 automotive or agricultural production cast iron block- cast iron heads only- block and heads are to remain unchanged in outside appearance; No overhead cams; No tunnel port manifolds; No more than 2" of carbuerator spacers allowed; No magnetos; Exaust pipes or headers must be turned straight up or straight down, No exaust flaps; Any single automotive or agricultural carburetor is allowed: Electric fans, water pumps and fuel pumps are allowed. 16. No extended or widened sheet metal with the exception of carburetor enclosures. 17. Tip over bars must support weight of the tractor in heaviest class; tip over bars will be tested by jacking up one pad at a time; pads must extend past rearmost point of rear tires; pads to be no more than 10" off the ground; flywheel and clutch assemblies must be shielded with 3/8" steel or SFI scatter blanket; All couplers in drive line must be shielded 360 degrees; Engine side shields must cover the sides of the block and harmonic balancer; Dead mans throttle, kill switch, fenders, high back seat, and ROPS(factory equivalent)or 2 bar (minimum) roll cage(constructed from .093 wall moly tubing or .125 wall mild steel tubing) required. 18. RECOMENDED : Fire suit 19. RECOMENDED : Back up light 20. REQUIRED : Fire extiguisher (mounted for easy access). |