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

Replacement Throttle Barrel for YS 120SR Engines

This YS Engine YSS3021 throttle barrel is supplied as a replacement for the YS Engine 120SR series. It links the carburettor throttle shaft to the external linkage, giving a solid mechanical path for user throttle inputs on small-scale engines.

The barrel's role is straightforward: permit smooth rotation and accurate alignment so throttle motion remains predictable. Inspect both the barrel and the carburettor bore for wear when carrying out a swap, and ensure the throttle returns to idle without sticking across its full range of travel.

When fitting, confirm the barrel seats squarely in the carburettor housing and the throttle arm aligns with the linkage. You may need to tweak linkage geometry or endpoint stops to reestablish correct idle and wide-open positions; always check movement through the full travel before initial running. Regular visual checks during servicing will detect wear before it affects control.