96710-TL Crankcase lap tool

For the engine builder seeking perfection, this JIMS crankcase lap tool is the gold standard for lapping the pinion bearing race in the right-side crankcase. Designed for 1958 to 1999 Big Twins, excluding Twin Cams, this tool offers far greater accuracy than conventional laps. It features a unique dual-support design, guiding the lap from both sides of the race. The cam gear side is supported by a base plate that locates on the engine case pins, holding tolerances within .0002 inches. This rigid arrangement allows you to power the lap with a low-speed drill without chatter, though it can still be used with a hand crank. It ensures the pinion race is perfectly centered with the flywheel assembly for maximum engine longevity.