YS Engine YSF7309 Cylinder Head Screws FZ110S  [YSF7309]

Cylinder head screws for FZ110S

This is a scale RC replacement fastener set intended for the YS FZ110S engine series, provided under the YS Engine part code YSF7309. The component set focuses on restoring or maintaining the mechanical connection between the cylinder head and the engine housing on model glow engines.

Use this set when replacing worn or lost fasteners during routine engine service. Before installation, inspect mating surfaces and thread engagement for damage or contamination. Start threads by hand to avoid cross-threading, then tighten progressively to seat the head evenly. Take care to avoid over-torquing, which can damage threaded holes in the crankcase or deform the head gasket surfaces.

For tuning and service work, secure cylinder head fasteners play a supporting role by maintaining consistent head sealing and compression during heat cycles and high-RPM operation typical of competition and regular track use. Consider a light application of a removable thread locker if vibration loosening has been an issue, but do not rely on thread locker to compensate for damaged threads.