Crank Shaft Drive Washer O.S. Engine OS4A408000 for RC Engines  [OS4A408000]

Axial-spacing washer for crank shafts

This O.S. Engine drive washer functions as an RC crank shaft part that manages axial clearance and keeps rotating parts aligned. It is a compact service or replacement piece commonly found with small nitro or glow engine crankshaft component kits.

Experienced hobbyists will find installation straightforward: locate the washer on the crank mating face, ensure it seats evenly, and then rotate the assembly to check for correct axial play. The washer preserves the gear and drive clearances that affect throttle response and overall engine setup stability.