YS Engine YSS5121 Throttle Barrel 91ST throttle barrel spare part  [YSS5121]

Throttle barrel spare part

This throttle barrel is presented as an RC-scale spare part intended for throttle linkage assemblies on model engines. It serves as the rotating sleeve inside a carburettor or throttle housing, providing the mechanical interface that controls airflow and throttle position on compatible RC engine setups.

The description focuses on practical fit and function rather than universal compatibility; confirm fit with your engine or vendor before installation. Typical installation requires removal of the carburettor housing, careful alignment of the barrel in the carburettor bore, and verification of smooth rotation across the throttle range. Keep lubrication and clearances as per your engine manufacturer's service guidance.

In tuning work the throttle barrel affects idle stability and throttle response by influencing the control geometry and airflow metering, so check linkage geometry and return springs after replacement. For maintenance, inspect for wear where the barrel contacts the carburettor bore and replace if scoring or excessive play is present.