YS Engine YSF9355 Replacement Throttle Barrel for FZ91 Carburetors  [YSF9355]

Replacement throttle sleeve for FZ91 series

This throttle barrel is supplied as YS Engine model YSF9355 and is built to work with the FZ91 carburetor range in RC glow engines. The barrel forms the bore the slide runs in, so its condition directly influences throttle feel, idle smoothness, and mid-range consistency.

Fitting is typical of small carburetor service: remove the top and slide, extract the old barrel, then fit the new one while checking O-ring condition and bore alignment. Make sure the slide operates freely and the barrel is correctly seated before you reassemble the carburetor.

As a wearable component, routinely check for scoring inside the bore, confirm the mating surface is true, and ensure the slide seals properly to prevent air leaks. Cleaning and a light protective film on sliding surfaces will aid consistent performance over time.