YS Engine YSF1259 Throttle Stop Spring 160 for YS Engine throttle assemblies  [YSF1259]

Compact throttle stop spring for precise idle control

The YS Engine YSF1259 throttle stop spring 160 is an RC-scale replacement spring made to deliver a defined stop and dependable return force in throttle linkages used with YS Engine throttle assemblies. This small component helps set a consistent idle stop and improves repeatability of throttle position on nitro and glow RC engines.

Compatibility is limited to YS Engine throttle assemblies and associated idle linkage where a compact stop spring is specified. Check your throttle housing and linkage layout before ordering to ensure fitment. The part is sold as an individual spring for hobby-grade engine maintenance and tuning.

Installation is straightforward for experienced hobby technicians: remove the throttle cover or linkage retaining clip, note the original spring orientation, transfer the spring to the same mounting points, and verify idle stop and throttle travel before the first run. Perform a final tuning check with the engine at operating temperature to confirm correct idle and stop settings.

The spring stabilizes the throttle stop and supplies consistent return force so idle adjustments remain predictable after repeated runs; it is not a service item for non-RC or full-scale engines.