YS Engine YSG2049 Disc Valve Pin Set Screw for FZ115S Precision Retention Fastener  [YSG2049]

Set screw overview and use

This YS Engine YSG2049 component is a small set screw designed to hold the disc valve pin in place on YS FZ115S disc valve engines. It serves as a replacement or spare fastener when removing, servicing, or reassembling the disc valve assembly on model aircraft and other RC platforms that use the FZ115S engine.

The component's role is straightforward: provide a reliable threaded hold for the disc valve pin so the valve plate and related parts remain indexed during operation and setup. When performing routine maintenance or swapping parts, confirm the screw seats correctly and check alignment of the disc valve plate before final tightening.

Installation notes: access the disc valve area per the engine's service access points, position the disc valve pin, insert the set screw, and tighten by hand then with the appropriate driver until snug. Avoid excessive torque and verify free movement of the disc valve plate after installation. Keep a small set of spare fasteners on hand for field service and scheduled maintenance.