50ST Crankcase Replacement for Service - YSS1001 by YS Engine  [YSS1001]

Replacement Crankcase for YS 50ST Engines

This crankcase is the replacement casing listed as YS ENGINE CRANKCASE 50ST #S1001 and is intended for use on the 50ST engine family in RC models. The text below focuses on fit, installation considerations, and the component's role in engine service and tuning.

Use this part when repairing or refreshing the lower engine assembly, especially during routine maintenance or when preparing an engine for precise tuning. The crankcase secures internal rotating parts and establishes mounting interfaces for accessories and external connections; check your engine serials and service manual for fit confirmation before installation.

This crankcase serves as a direct replacement component for maintaining or rebuilding YS 50ST-series RC glow engines, helping restore structural integrity and alignment for accurate tuning and reliable operation.