YS Engine YSS3016 Back Plate Spare for 120SR Engines  [YSS3016]

Back plate for 120SR engine rear case

This back plate is an aftermarket replacement intended to take the place of the rear cover on YS Engine 120SR units. The focus here is on correct fitment and workshop handling rather than any performance promise, describing how the part locates within the engine assembly.

Fit notes: make sure the YSS3016 identifier matches the component you need before ordering. Typical fitting calls for removal of the muffler to expose the rear case, alignment of the plate to the crankcase and careful tightening of the original screws to secure the part.

Service and tuning context: the plate supplies a mounting surface for rear-mounted items and seals the crankcase. During rebuilds it helps ensure parts are reassembled to the intended geometry; replace gaskets or seals while the engine is open for service.

Preserve original fasteners where they are usable and make sure mating faces are free from debris or burrs to ensure an even seal and reliable operation.