FZ91 Carburetor Throttle Barrel - YSF9355 by YS Engine  [YSF9355]

Precision throttle barrel for FZ91 carburetors

This throttle barrel is an RC-scale spare part designed around the FZ91 carburetor family and supplied under YS Engine model YSF9355. It serves as the rotating bore that guides airflow under the carburetor slide, so any wear or scoring will affect throttle response, idle stability, and the consistency of mid-range running in glow-engine RC models.

Installation is straightforward for someone experienced with small glow carburetors: remove the carburetor top and slide assembly, withdraw the worn barrel, and fit the new unit while checking O-rings and bore alignment. Ensure the barrel seats evenly and that the slide moves freely through the bore before final reassembly.

For routine service, inspect the bore for scoring, verify the mating surface is flat, and confirm sealing around the slide to avoid air leaks. Proper cleaning and light lubrication of sliding surfaces will help keep throttle behavior predictable during setup and track use.