YS Engine YSF1222 piston wrist pin for 110 120 140 engines replacement part  [YSF1222]

Piston wrist pin for 110/120/140 engines

This YS Engine YSF1222 piston wrist pin is an RC-scale replacement part designed to retain the piston on YS 110, 120 and 140 series glow engines. It serves as the small but critical link between piston and connecting rod, intended for routine maintenance or when worn pins cause piston play.

Installers will find it useful when refreshing an engine during a service cycle or after heavy use; the pin is intended to be pressed into the piston and secured per the engine's factory method, and it should be checked for fit and free rotation of the piston on the pin during reassembly. This part supports tuning tasks by restoring proper piston alignment and minimizing unwanted lateral movement that affects compression and running consistency.