50ST Throttle Barrel Replacement for Carburetor - YSS1025 by YS Engine  [YSS1025]

RC carburetor throttle sleeve

This YS Engine YSS1025 throttle barrel is a scale replacement part designed for use with engines identified by the 50ST designation. It replaces the throttle bore where the carburetor throttle slide or spindle runs, and is supplied as a single spare item without extra fittings.

Fitment is indicated by the 50ST reference in the part name; always check the barrel dimensions against your carburetor and engine before fitting. The component restores concentric movement of the throttle slide and helps maintain smooth airflow control inside the carburetor assembly.

Installation tips: remove the carburetor from the model, inspect seals and O-rings, then ease the replacement barrel into the carburetor body making sure inlet and outlet align and the throttle spindle moves freely. Do not force parts and confirm smooth travel of the throttle slide after reassembly.

Tuning note: a correctly fitted throttle barrel reduces slide binding and helps stabilise idle and throttle response, which can make setup and routine servicing of RC nitro motors more predictable.