YS Engine YSF9355 Precision Throttle Barrel for FZ91  [YSF9355]

FZ91 carburetor throttle barrel details

This RC-scale throttle barrel is supplied under YS Engine model YSF9355 and is matched to the FZ91 carburetor family. The barrel provides the rotating bore for the carburetor slide; its finish and concentricity are critical to throttle precision, idle quality, and consistent mid-range power delivery.

Fitting follows standard carburetor practice: remove the lid and slide assembly, withdraw the worn barrel and fit the replacement, inspecting O-rings and confirming the bore runs true. Ensure the slide moves smoothly and the barrel is seated correctly before reassembly.

As a consumable service part, check the bore for scratches, ensure the mating flange is flat, and verify the slide seal to prevent air leaks. Regular cleaning and careful lubrication of sliding surfaces will maintain consistent throttle characteristics during setup and use.