my motor on alchohal with out of frames, stock stroke, stock bore, but drag ported with 35 strykers and bald knobbys ran a 7.70 with 2-5 over ride.
oh and with the mods in your sig there is no reason you should get beat by the dirtbike unless your bike brakes, you fall of, or just plan cant ride. Ive yet to loose to a dirtbike some were closer than other but havent lost yet!