Replacement Back Plate YSS3016 for YS Engine 120SR  [YSS3016]

Service rear cover for 120SR units

This back plate is supplied as an RC spare intended to replace the rear cover on YS Engine 120SR models. The wording focuses on correct fit and workshop practice rather than claiming performance improvements, and explains how the part integrates with the engine case.

Fit advice: confirm the YSS3016 reference matches your engine variant prior to purchase. Installation generally involves removing the exhaust/muffler to gain access to the rear case, aligning the replacement plate to the crankcase and fastening it with the existing screws.

Maintenance role: the plate acts as a structural mount for rear-mounted components and helps seal the crankcase. It supports accurate reassembly during overhauls and assists in keeping the internal geometry as intended; replace worn seals while the engine is opened.

Retain original fasteners where serviceable and clean mating faces of old gasket material or deposits to ensure a reliable seal after fitting.