Jims Motorcycle Tools
JIMS 96710-TL Big Twin Case Lap Tool for Harley-Davidson
JIMS® goes the next step in case lapping with the release of our new pinion bearing race lap. This tool allows the engine builder to achieve the best of both worlds: removal of more material in less time with greater accuracy than a conventional lap.
JIMS® case lap—the first of its kind— is guided on both sides of the pinion bearing race. This additional support on the cam gear side of the bearing race is achieved by means of a bolt on base plate that precisely locates a drill bushing in which the lap turns. This base plate is located on the same engine case pins as the cam cover. The positioning of this drill bushing is held within .0002” to the engine case pins and within .0002” of case centerline. Now, instead of guiding only from the left side with Timken® bearings, which are a floating fit, JIMS® case lap uses a special ground bearing sleeve to hold left side of lapping shaft without movement. Both ends of the lap are supported in precisely the same centerline
as the flywheel assembly.
With this extremely rigid arrangement, it is possible to power the lap with a low speed drill motor without fear of chatter in the lapped bearing race. If a drill motor is not available, JIMS® lap can be powered by the conventional hand crank. Use JIMS® No.1710
to remove snap ring, a must on 1990-present H-D® cases.
Note: For 1958-69 early cases, use H-D® No.2341HW original cam cover screws.
All wear surfaces are hardened and ground tool steel for a lifetime of service.
Use on all 1958-present single cam. (Note: Includes aftermarket motors.)
Availability: Drop ship from factory. Usually ships within 3-4 days. Ships via UPS.