50ST Compatible Throttle Barrel - YSS1025 by YS Engine  [YSS1025]

Throttle barrel: replacement and function

The YS Engine YSS1025 throttle barrel is a replacement component intended for carburettors paired with 50ST-designated engines. It occupies the throttle bore where the slide or spindle operates and is supplied as a single spare without accompanying fittings.

The 50ST identifier denotes likely compatibility; always verify the barrel against your carburettor model prior to installation. This part helps re-establish concentric slide movement and ensures more even airflow through the carburettor throat.

Fitting procedure: extract the carburettor from the model, inspect seals and O-rings and then insert the replacement barrel into the carburettor body taking care to maintain inlet/outlet alignment and unobstructed throttle travel. Avoid forcing components if they do not seat smoothly.

Tuning considerations: replacing a worn barrel can reduce slide sticking and deliver more predictable idle and throttle response, which eases fine tuning and routine servicing of nitro engines.