depends on distance, for 500ft-660ft(1/8 mile),yes,timing helps,stretch out the distance to 1000ft-1320ft(1/4 mile) and the increased timing slows the same sled down. More adavnced ign. timing puts more heat into the piston,retarded timing puts more heat into the pipe. If your bored read on the internet about pipe temps and peak rpm on a 2stroke and youll find your answer.