Mid west supercub has finished building a flywheel for me,It weighs 8lbs without starter ring.This is for single cyl overhead valves.It has adjustable timing grooves to move your timing up .There is a picture on midwestsupercub site on the opening page.CV and CH motors.Call and order yours today.The cost is 325.00 .THE ONLY WAY TO RACE IS WITH KOHLER POWER!!!!!!!!!!!!!!!!!!Thanks MOW FAST.