YS Engine YSF5113 Valve Cover Screws Compatible with FZ53 and FZ63  [YSF5113]

Service Replacement Screws for YS FZ53 and FZ63 Valve Covers

This replacement pack contains the valve cover screws for use with YS FZ53 and FZ63 glow engines. These fasteners are intended to replace the screws that hold the engine top cover in place, supporting correct sealing and part alignment during normal maintenance and operation.

Fit these screws when performing routine top-end work, including valve cover removal, gasket replacement, or reassembly after servicing. They are designed to match the thread form and fastening role found on the stated YS engine models.

Reassembly guidance

• Lift the valve cover off carefully to avoid damaging the gasket; keep a note of screw positions if they differ and clean the mating surfaces before refitting.
• Hand-start each screw to prevent cross-threading, then tighten gradually in sequence to seat the cover without applying excessive force.
• Inspect the valve cover seal after a short running period at operating temperature and retorque if required once the engine has cooled.