YS Engine YSF1231 Back Plate Screw for F120  [YSF1231]

F120 Back-plate Mounting Screw

This YS Engine back plate screw is a direct spare for the F120 back plate assembly used in scale RC glow engines, supplied under model YSF1231. It functions as the fastener that secures the rear cover to the crankcase and is intended for service replacement when original fasteners are worn, damaged, or missing.

Fitting guidance: carefully start the screw into the back plate boss and apply even torque until seated; cease if there is unusual resistance and inspect the thread engagement. The component's purpose is secure mechanical retention rather than any engine tuning function, so use it to restore correct assembly and cover sealing.

Compatibility: listed for F120 back plate layouts; confirm that part YSF1231 matches your engine's back plate pattern before purchase. The screw supports standard maintenance and prompt replacement during workshop or race-day servicing.