O.S. Engine OS29730000 Crankshaft Ball Bearing F for GT55, GT60  [OS29730000]

Front Crankshaft Bearing for GT55/GT60

This is an RC-scale replacement part intended for the front crankshaft location of compatible O.S. engine models listed in the product title. It serves the basic role of supporting the crankshaft spindle, reducing friction at the front end, and helping maintain smooth rotation under normal running conditions.

Compatibility is limited to the models shown in the product name, so confirm GT55 and GT60 compatibility before ordering. Installation is a mechanical press-fit operation at the crankshaft front plate; use a soft-headed driver or appropriate bearing press to avoid damaging the crankcase or bearing race. Remove the carburetor and cooling head as needed to access the crankshaft during replacement.

When tuning or troubleshooting engine response, inspect the bearing for roughness, axial play, or excessive endfloat; a worn front bearing can introduce vibration that affects idle stability and throttle response. After installation, verify free rotation by hand before reassembling the engine, and perform a brief running check at low throttle to confirm correct seating.