FS-200S Drive Coupling Washer OS44508000 by O.S. Engine  [OS44508000]

Drive coupling washer for FS-200S

This drive washer is intended for the FS-200S engine series and is catalogued as O.S. Engine model OS44508000. It mounts on the crankshaft end to position the drive coupling and help maintain proper axial clearance while running.

Fitment is simple in a hobby setting: slide the washer onto the crankshaft flange so it bears against the crankcase face or an adjacent spacer, ensure the coupling runs true, then check the endplay using a feeler or small gauge. If excessive axial movement is present, inspect the seating faces and surrounding shims rather than changing washer size immediately.

During maintenance the washer reduces axial play that could affect coupling alignment or gear meshing. Regular inspection for wear, flattening or deformation is recommended when rebuilding or after diagnosing vibration or premature coupling wear in nitro RC engines.