Hello forum, i am a newbie, have had experience with track karts using the 160gx 5.5 hp honda engine with a 4 to 1 relation which is really an 8 to 1 because of the wet clutch (2 to 1 relation ), I am now installing a clone 6.5 hp harbor freight engine on an old 3 wheeler, using a jacksaft to obtain a 10 to 1 relation and also because the kawasaki 3 wheeler uses #520 chain and the clutch uses #40 chain, my question would be what do you think of a 10 to 1 relation with 18 inch diameter rear tires and also what 3/4 centrifual clutch would you advise me to get good price and good working clutch, I know 3 wheelers are very instable so its mainly torque and not speed I am looking for I think, thanks