YS Engine YSF1222 Piston Wrist Pin for 110 120 140 Engines Replacement Part  [YSF1222]

Compact wrist pin for YS 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 acts as the small but essential link between piston and connecting rod, intended for routine maintenance or when a worn pin allows piston play.

Technicians will find it useful when servicing an engine; the pin is pressed into the piston and secured following the engine manufacturer's method, and it should be inspected for correct fit and free piston rotation during reassembly. Fitting a correctly seated pin restores piston alignment and reduces lateral movement that undermines compression and running consistency.