YSS7106 Side-Exhaust Spare Piston for 61ST-H by YS Engine  [YSS7106]

Side-exhaust piston fitment for 61ST-H engines

This replacement piston is made to the 61ST-H piston specification for side-exhaust RC glow engines. Supplied by YS Engine as a spare, it is intended for maintenance work or complete engine rebuilds on units using the 61ST-H pattern.

Role and fit: the piston moves within the sleeve to create and maintain compression, working with the ring and connecting rod in side-exhaust layouts. Replace the piston when inspection shows scoring, excessive wear or compression loss.

Installation notes: access to the piston requires engine disassembly and removal of the sleeve and wrist pin. Clean contact surfaces, apply correct lubrication when reassembling, and adhere to standard small engine refurbishment steps. If unsure, seek a technician experienced in glow engine repairs.

Tuning and maintenance context: a new piston helps return steady compression and consistent throttle response; always review sleeve wear, ring seating and port timing as part of the overhaul for best results on track or during sport use.