"I use your Rivera Pro Clutch with a Primo primary belt drive and Rivera Taper-Lite push rods on our Pro Gas AHDRA race bike. It has a 98ci House of Horsepower generator lower end, S.T.D evo full race top-end, S & S crank assembly,JE thermal coated pistons with Hastings chrome rings. We run a NOS system, 4 speed transmission with Andrews back cut gears and I shift manually; no air or electrics. It has approximately 250 HP at the rear tire but the clutch has never failed,and we have only replaced the clutch one time in 5 years. This past May 2 in Bakersfield, CA, we won 1st place with this combination."