YS Engine YSS7121 Precision Throttle Barrel Spare Part  [YSS7121]

Precision throttle sleeve for RC glow engines

The YS Engine YSS7121 throttle barrel is intended as an RC-scale spare for installation within YS Engine carburetor assemblies. It replaces the barrel section that forms the throttle slide bore and works with the throttle plate assembly, described here in neutral technical terms for hobbyists.

Constructed in an aluminium-style finish, the barrel aims to maintain a true bore and encourage smooth throttle operation. For replacement, remove the carburetor from the model, check the throttle slide and linkages for wear, fit the new barrel into the carburetor body, and confirm unobstructed travel through the throttle range prior to refitting to the engine. Always verify the YSS7121 reference matches your carburetor casting before buying.

In tuning workflows the barrel contributes to consistent throttle response and improved idle stability by preserving bore shape and reducing irregular airflow at partial throttle. Keep this spare available for routine maintenance or when restoring throttle reliability on glow-engine RC models.