YS Engine YSF1234 cam gear cover screws for 120 and 140 engines  [YSF1234]

Cam gear cover screws for YS 120/140

This set of cam gear cover screws is specified for use with YS 120 and 140 engine cam cover assemblies and serves as direct replacement fasteners for RC-scale engines. The parts are intended to secure the cam gear cover, maintain correct gear mesh, and prevent movement under normal running and tuning adjustments.

Installation is straightforward for anyone familiar with small engine service: remove the cam cover, inspect the mating surfaces and thread engagement, then install screws by hand to ensure correct alignment before final tightening. Use a suitable hex driver sized for the screw head, apply light, even torque, and avoid over-tightening which can strip the lightweight cover threads common in RC engine assemblies.

For tuning and maintenance, these screws play a small but important role. Properly fastened cover screws help keep cam timing stable after adjustments, reduce the chance of oil seepage at the cover seal, and make subsequent disassembly repeatable. If you replace the cam cover or perform valve timing checks, verify screw torque and check for thread wear during reassembly.