YS 91SR Service Back Plate YSS9116 for YS Engine  [YSS9116]

Replacement back plate for use with YS 91SR engines

The YS Engine YSS9116 back plate is supplied as a replacement for the 91SR model engines. It serves as the rear closure for the crankcase and is suitable for routine maintenance, rebuilds, or when the factory part shows wear.

Fitment involves removing the rear fasteners, noting any gaskets or seals, and refitting the back plate while tightening screws progressively to maintain alignment. Follow good workshop practice for small nitro and fuel engines to prevent misalignment or leaks.

As a service part, the back plate supports crankcase alignment and sealing; replacing a degraded plate can help restore proper idle behaviour and engine performance. Always confirm compatibility with your YS 91SR engine assembly prior to final installation.