The OS44503200 piston is supplied for use with O.S. Engine FS-200S and FS-200S-P units as a replacement part. It helps recover compression and contributes to consistent running behavior in glow model applications.
Replacing a worn piston typically restores the sealing surface and reduces blow-by that can upset idle and throttle transitions. Ensure the new piston matches the engine cylinder and that ring condition is correct before reassembly.
Fit this piston when carrying out maintenance or preparing an engine for tuning; check ring seating and clearances at install time to secure reliable compression and response.
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