YS Engine YSF9355 Throttle Barrel FZ91  [YSF9355]

Throttle barrel for FZ91 carburetor

This throttle barrel is an RC-scale spare part designed around the FZ91 carburetor family and supplied under YS Engine model YSF9355. It functions as the rotating bore that guides airflow through the carburetor slide, so its condition affects throttle response, idle stability, and the consistency of mid-range running in glow-engine RC models.

Installation is straightforward for someone familiar with small RC carburetors: remove the carburetor top and slide assembly, extract the worn barrel, and replace it with 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 tuning and maintenance this barrel is a wearable service item; inspect the bore for scoring, check the mating surface for flatness, and confirm sealing around the slide to avoid air leaks. Proper cleaning and lubrication of the sliding surfaces will help maintain predictable throttle behavior during setup and track sessions.