The heart and soul of any motorcycle (battery-powered motorcycles notwithstanding) is its engine. From its mighty roar to its fierce torque, a reliable engine can turn an average motorcycle into a ...

01] Steel shafts are pressed into the ends of the rotors and pinned in place. A No. 6 taper pin is used for engines making less than 2,500 hp, and a No. 8 pin is used for more serious stuff. The ...