YS Engine YSS1025 throttle barrel replacement part for 50ST engines  [YSS1025]

Throttle barrel for RC carburetor

This YS Engine YSS1025 throttle barrel is an RC-scale replacement component intended for use with 50ST-designated engines and throttle assemblies. It serves as a direct spare for the throttle bore where the carburetor throttle slide or spindle operates, and is supplied as a single replacement item without additional fittings.

Compatibility is indicated by the 50ST reference in the part designation; verify fitment against the engine or carburetor model before installation. As a model-scale accessory, it is designed to restore proper throttle slide alignment and smooth airflow control within the carburetor assembly.

Installation notes: remove the carburetor from the model, inspect existing seals and O-rings, then slide the replacement barrel into the carburetor body ensuring smooth inlet/outlet alignment and unobstructed throttle movement. Avoid forcing components and confirm free travel of the throttle spindle after reassembly.

Tuning and maintenance role: the throttle barrel affects throttle response and idle stability by maintaining concentric movement of the throttle slide. When worn or scored, replacing this barrel can reduce sticking and improve predictable throttle action during setup, break-in, or routine servicing of RC nitro motors.