YS Engine YSS3005 120SR Cylinder Liner Replacement  [YSS3005]

Service Replacement: 120SR Cylinder Liner

The YS Engine YSS3005 cylinder liner is presented as a replacement component for the 120SR series of RC glow engines. The description explains the component's role during engine servicing and how it helps restore compression and stable running characteristics at model scale.

Designed for users familiar with small engine maintenance, installing the liner requires removal of the engine head and a careful check of piston and ring seating to ensure correct clearances; any pistons showing heavy wear should be addressed before fitting the new liner.

Include this replacement liner in scheduled rebuilds and confirm bench fit and running checks to maintain reliable tuning and predictable performance.