YS Engine YSS7106 piston side-exhaust 61ST-H spare piston  [YSS7106]

Side-exhaust piston for 61ST-H

This is a replacement piston intended for RC-scale side-exhaust engines using the 61ST-H piston pattern. It is supplied as a spare part by YS Engine and intended for use during routine engine maintenance or rebuilds on compatible 61ST-H side-exhaust engine assemblies.

Role and fit: the piston is the rotating component inside the engine's cylinder and works with the sleeve, rings and connecting rod as part of the combustion cycle in side-exhaust configurations. Use this part when piston wear, scoring or compression loss is identified during inspection.

Installation notes: piston replacement requires disassembly of the engine to access the cylinder and connecting rod. Clean all mating surfaces, ensure correct lubrication during reassembly, and follow standard engine reconditioning practices. If unsure, seek assistance from a technician familiar with small RC glow engine service.

Tuning and maintenance context: replacing a worn piston restores compression consistency and contributes to predictable power delivery; it is a maintenance item used alongside inspection of the sleeve, ring condition and port timing components when preparing an engine for competition or track use.