They just don't ren the same! I had a stock cylinder 4mil bike that I did the porting on v2 reeds on stock carbs on alky and would smash my buddy's 4mil long rod cum motor with same pipes and tires and swinger 300 ft mine would go like 4.3 his 4.5 with 35pwks on alky!! Just built another 4 mil stock cylinder long rod and its a turd!!!