YS Engine YSF9165 Carburetor Screw Set for RC Nitro Engines  [YSF9165]

Replacement screws for YS Engine carburetors

This small hardware set includes replacement carburetor screws designed for use with YS Engine carburetor assemblies on RC nitro engines. They act as the fastening points that keep carburetor parts secured during tuning and routine service, intended for RC-scale applications.

Installation guidance: install screws in the factory locations, start threads by hand to avoid cross-threading, and tighten only until seated to avoid damaging carburetor housings. Inspect reused screws for thread deformation and replace any that show wear. When working on needle adjustments, keep screw access clear so tuning remains predictable.

Role during tuning: these screws are small but necessary parts that maintain alignment and sealing while you set mixture and idle. Treat them as consumable spares to replace during regular service or after a teardown.