YS Engine YSS3005 Cylinder Liner 120SR replacement part  [YSS3005]

Cylinder liner for 120SR engines

This YS Engine YSS3005 cylinder liner is presented as a direct replacement element for the 120SR series RC glow engines. The text focuses on the component's role within an engine rebuild, outlining fitment context and its function in restoring compression and running consistency at model scale.

The liner is an RC-scale accessory intended to be fitted by users familiar with small engine disassembly and reassembly. Proper installation requires removal of the engine head and careful inspection of the piston and ring seating to confirm dimensional alignment; oversized wear or damaged pistons should be addressed before reuse.

Use this replacement liner as part of a measured engine rebuild or maintenance cycle; verify fit and clearances on the bench before track use to maintain predictable tuning behaviour.