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

Rear cover for YS 120SR engines

This back plate is an RC-scale spare designed to replace the rear cover on YS Engine 120SR series units. The description emphasises fit and service role rather than performance claims, outlining how the component interfaces with the engine assembly and common workshop steps.

Fit notes: verify the YSS3016 part number corresponds to your 120SR model before ordering. Typical installation requires removal of the muffler and access to the engine rear case, followed by careful alignment of the back plate to the crankcase and secure fastening with the original screws.

Tuning and service role: the back plate provides a structural mounting surface for rear-facing components and seals the crankcase. During rebuilds it supports correct reassembly and helps maintain the intended internal geometry; replace worn seals as part of routine maintenance.

Keep original fasteners and inspect mating surfaces for burrs or deposits before installation to ensure a clean fit and reliable sealing during engine operation.