YS Engine YSS7121 Throttle Barrel Replacement for YS Carburetors  [YSS7121]

Replacement throttle barrel for glow carburetors

The YS Engine YSS7121 throttle barrel is an RC-scale replacement part designed for use inside YS Engine carburetor assemblies. As a direct-replacement barrel it interfaces with the throttle slide bore and throttle plate and is described here in neutral, technical terms for workshop use.

The barrel is produced in a machined aluminium style intended to keep the bore true and maintain smooth throttle travel. When replacing a worn or damaged barrel, remove the carburetor from the model, inspect the throttle slide and linkage for wear, fit the new barrel to the carburetor body, and verify free movement across the throttle throw before reinstalling on the engine. Always confirm the YSS7121 part number against your carburetor casting prior to purchase.

For routine maintenance and tuning the throttle barrel helps preserve consistent throttle response and stable idle characteristics by maintaining bore geometry and limiting airflow irregularities at partial throttle. Keep this spare on hand to restore dependable throttle actuation on glow-engine RC models.