YS Engine YSF1234 Cam Gear Cover Screws for 120 and 140 Engines  [YSF1234]

Replacement cam cover screws for YS 120/140 engines

This screw set is specified for YS 120 and 140 engine cam cover assemblies and functions as direct replacement fasteners for RC-scale engines. The parts secure the cam gear cover, help preserve correct gear mesh, and limit cover movement during normal running and tuning adjustments.

Installation is straightforward for anyone experienced in small engine service: remove the cam cover, inspect the mating surfaces and thread engagement, then start screws by hand to ensure alignment before final tightening. Use a correctly sized hex driver, apply light, even torque, and avoid over-tightening which can strip the lightweight cover threads often found on RC engine assemblies.

For tuning and maintenance these screws are small but important. Properly fastened cover screws support stable cam timing after adjustments, reduce the risk of oil seepage at the cover seal, and make future disassembly repeatable; check screw torque and thread condition when reassembling after repairs.