YS Engine YSF1234 Cam Cover Screw Set for 120 & 140 Engines  [YSF1234]

Cam cover fasteners for YS 120/140 models

This screw set is intended for the cam cover assemblies used on YS 120 and 140 engines and acts as replacement threaded fasteners for RC engine applications. The components secure the cam gear cover, help maintain correct gear mesh, and reduce the likelihood of cover movement under normal running and tuning operations.

To install, remove the cam cover and inspect mating surfaces and thread engagement. Start screws by hand to ensure correct alignment, then use a matching hex driver to tighten evenly with light torque; avoid over-tightening which can damage the cover threads common on these engines.

In tuning and maintenance the screws contribute to repeatable assembly and timing checks. Properly installed cover screws aid cam timing stability after adjustments, reduce oil seepage at the cover seal, and simplify future disassembly; check torque and thread condition whenever the cover is serviced.