YS Engine YSF5113 Valve Cover Screws for FZ53 and FZ63 Replacement  [YSF5113]

YS FZ53 and FZ63 Valve Cover Fasteners

This RC-scale replacement pack contains the valve cover screws intended for use on YS FZ53 and FZ63 model glow engines. The screws act as direct replacements for the fasteners that secure the engine's top cover, helping maintain proper sealing and part alignment during normal use and service.

Fit these screws when performing routine top-end service, such as removing the valve cover for inspection, replacing the gasket, or reassembling after maintenance. The parts are designed to match the thread form and the fastening role found on the specified YS engine models.

Installation notes

• Remove the valve cover carefully to avoid damaging the gasket; note original screw positions if they differ and clean contact surfaces before reassembly.
• Hand-start each screw to avoid cross-threading, then tighten progressively and evenly to seat the cover without over-torquing.
• After a short test run, check the valve cover sealing once the engine has reached operating temperature and retorque as required after cooling.