Under Cover Sealing Gasket for FZ63S YSF3177 - Replacement for RC Engines by YS Engine  [YSF3177]

Sealing gasket details for FZ63S

The YS Engine YSF3177 under cover gasket acts as the sealing interface for the FZ63S engine lower cover. It prevents oil from escaping at the junction and helps keep internal conditions stable during both running and workshop maintenance.

Fitting advice for hobbyists: remove the under cover, clean contact faces of oil and debris, position the gasket flat and free of folds, then reinstall the cover while tightening screws evenly to recommended torque. Avoid over-tightening and inspect the sealing face for gouges or wear before refitting a new gasket.

Although the gasket does not alter power delivery, a good seal preserves compression and avoids contamination that could change engine response. Replace the gasket if the under cover is removed for service or if the gasket shows signs of deterioration.