GT55 / GT60 Front Crankshaft Bearing - O.S. Engine OS29730000  [OS29730000]

Front-end crankshaft bearing (GT55, GT60)

This is an RC engine front crankshaft replacement bearing intended for the GT55 and GT60 models listed in the product title. It helps support the crank spindle and reduces friction at the front end to keep rotation smooth during normal use.

Compatibility is restricted to the GT55 and GT60 variants named in the product title; confirm your engine model before purchase. The bearing installs by pressing into the crankcase front plate. Use a bearing press or a soft-faced driver to seat the outer race without deforming it, and remove the carburetor and cooling head as required to reach the crankshaft location.

For tuning and troubleshooting, inspect the bearing for roughness, excessive axial play, or endfloat, since a worn front bearing can produce vibration that affects idle and throttle response. After fitting, rotate the crank by hand to check freedom of movement and complete a short low-throttle run to verify correct installation.