O.S. Engine OS44508000 Drive Washer for FS-200S Crankshaft  [OS44508000]

Crankshaft drive washer for FS-200S engines

This drive washer is a crankshaft component intended for the FS-200S engine family, supplied under the O.S. Engine model OS44508000 designation. It sits on the crankshaft end to locate the drive coupling and maintain correct axial clearance during operation.

Installation is straightforward for hobby workshops: slide the washer onto the crankshaft flange so it seats against the crankcase face or adjoining spacer, confirm the drive coupling runs true, then check endplay with a feeler gauge or by gently rocking the assembly. If play exceeds expected limits, inspect mating surfaces and any adjacent shims or spacers before changing washer thickness.

For tuning and maintenance the washer helps stabilise the drive interface and limit unwanted axial movement that can affect gear engagement or coupling alignment. Regular inspection for wear or deformation is advised when rebuilding or when diagnosing vibration or premature coupling wear in nitro RC engines.