YS Engine YSS3021 Throttle Barrel 120SR - Throttle Barrel Spare for RC engines  [YSS3021]

Throttle barrel for YS 120SR

This YS Engine YSS3021 throttle barrel is an RC-scale replacement part intended for use with the YS Engine 120SR line. It serves as the interface between the carburettor throttle shaft and the throttle linkage, providing a direct mechanical path for throttle input on small model engines.

As a spare part, the barrel's role is strictly mechanical: ensure smooth rotation, accurate linkage alignment, and predictable throttle motion. Inspect mating surfaces for wear when replacing the part and confirm the throttle returns cleanly to idle without binding across the full travel.

When installing, verify fit and alignment in the carburettor housing and with the throttle arm. Minor adjustments to linkage geometry or stop positions may be required to restore factory idle and full-throttle positions; test movement through the full range before running the engine. Regular inspection during routine maintenance helps catch excessive wear or play that can affect throttle response.