YS Engine YSS1025 Throttle Barrel for 50ST Engines - Compatible Replacement  [YSS1025]

Throttle sleeve for nitro model carburettors

The YS Engine YSS1025 throttle barrel serves as an aftermarket replacement component for carburettors paired with 50ST-designated engines. It occupies the throttle bore where the slide or spindle operates and is shipped alone without additional mounting hardware.

Compatibility is signalled by the 50ST code in the product title; confirm the part matches your carburettor before installation. As a direct spare, it helps return the throttle slide to concentric movement and supports consistent airflow through the carburettor body.

To fit: remove the carburettor from the airframe, check existing seals and any retaining clips, then gently insert the replacement barrel into the carburettor body ensuring smooth inlet/outlet alignment and unobstructed slide action. Avoid forcing the barrel into position.

Service impact: a well-fitted throttle barrel reduces the risk of slide binding and uneven airflow, aiding steady idle and improved throttle modulation during tuning or after routine maintenance.