O.S. Engine OS27381210 Replacement Crankshaft Ball Bearing for 32HS-HX, 46HS, 6H, 7H  [OS27381210]

Crankshaft support bearing for nitro RC engines

This O.S. Engine crankshaft ball bearing is a direct replacement part matched to the engine codes shown in the model name. It is built to support the crankshaft assembly in 32HS-HX, 46HS, 6H and 7H engines and to cut rotating friction for steadier idle and cleaner throttle response.

When you service a nitro RC motor, always swap worn crankshaft bearings for the correct type to keep balance and clearances intact. For installation use a press or a socket that bears evenly on the outer race so the internal balls and raceways are not stressed. Verify smooth rotation and minimal endplay by hand before final reassembly.

Maintenance tips: look for roughness, pitting or discoloration after heavy running, clear debris from the crankcase before fitting a new bearing, and apply a light oil after initial run-in instead of thick grease to avoid trapping contaminants. A smooth, low-friction bearing helps maintain stable RPM and makes needle valve adjustments more predictable.