61ST-H Piston (Side-Exhaust) YSS7106 for YS Engine  [YSS7106]

61ST-H piston replacement details

This is a replacement piston produced to the 61ST-H specification for side-exhaust RC engines. It is offered as a spare by YS Engine and is intended for use when performing maintenance or complete rebuilds on engines that follow the 61ST-H piston pattern.

Role and fit: the piston reciprocates within the cylinder sleeve and works with the piston ring and connecting rod to sustain compression and power in side-exhaust configurations. Replace the piston when wear, scoring or compression loss is detected during inspection.

Installation notes: piston change requires full engine teardown to access the sleeve and wrist pin. Ensure mating surfaces are cleaned, apply appropriate assembly lubrication, and follow accepted procedures for small glow engine reconditioning. If necessary, consult a technician experienced with RC glow engines.

Tuning and maintenance context: replacing a worn piston reinstates stable compression and consistent power delivery; include sleeve, ring and port timing checks when preparing the engine for competition or extended track use.