Excellent Motor! My buddy and I swapped these into our street legal 1991 and 1994 Honda CT70's. Changed rear gear from 35 to 31 tooth. They do 60mph now. We have stock pipes and the 22mm carb that came with it though we had to change the main jet to 120 from the 95 that came in it. Needle in middle position no carb adjustments needed. They pull hard! I recommend oil coolers and ez-pull clutch levers. We swapped in the stock stators because the piranha lighting coil barely lit the headlight.