91SR3C Rear Case Plate YSS9216 Replacement for Tuning by YS Engine  [YSS9216]

91SR3C Rear Case Plate Overview

This YS Engine YSS9216 back plate is an aftermarket spare made for the 91SR3C engine family, intended for maintenance and repair tasks. It functions as the rear case closure and should be fitted during rebuilds to restore proper crankcase alignment.

Confirm that your engine carries the 91SR3C designation before ordering; the plate is not guaranteed to fit other YS Engine models without explicit confirmation. The item ships as a single replacement back plate to replace worn or damaged originals.

Installation advice: remove old gasket remnants, inspect and clean the crankcase face, and follow the correct screw torque pattern to avoid distorting the case. Replace any gaskets or O-rings with parts specified for the 91SR3C when necessary.

Effect on setup: while the back plate does not change ignition timing, correct installation supports crankshaft alignment and crankcase sealing, both of which help maintain predictable tuning and steady running characteristics. Check the plate for flatness during engine rebuilds and swap it out if deformed.

For model engine maintenance, the YS Engine YSS9216 back plate is the recommended spare to restore the 91SR3C rear closure during teardown and reassembly.