YS Engine YSS3005 Cylinder Liner for 120SR Rebuild Part  [YSS3005]

Replacement Cylinder Liner for 120SR Series

This YS Engine YSS3005 cylinder liner is supplied as a direct replacement component for the 120SR range of RC glow engines. The description concentrates on the liner's function during an engine overhaul, explaining fitment context and its role in restoring compression and consistent running at model scale.

The liner is an RC-scale component aimed at users who are comfortable with small engine strip-down and assembly. Correct fitting requires removal of the engine head and careful inspection of piston and ring seating to confirm dimensional agreement; heavily worn or damaged pistons should be serviced or replaced before reuse.

Use this replacement liner as part of a measured engine rebuild or maintenance cycle; check fit and clearances on the bench prior to running to maintain predictable tuning behaviour.