Replacement starter clutch assemblies are designed to improve clutch life under hard starting conditions. ALL BALLS starter motors are manufactured with all new components that have been fine-tuned for starting the H-D V-Twin engine. Our clutches utilize 20% oversize rollers, and the idler gears are manufactured from cold-headed steel. End frames are cold-chamber die cast and machined on precision fixtures. Armature hairpins are resistance-fused to the commutator. All starters are supplied with a 10/32 threaded output shaft, and a conversion bolt for the earlier 1/4-20 threaded output shafts.