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

Throttle stop spring for YS Engine

This YS Engine YSF1259 throttle stop spring 160 is an RC-scale replacement spring designed to provide a defined stop and return force in throttle linkages used with YS Engine throttle assemblies. It serves as a small but important component for setting idle stop and improving repeatability of throttle position in nitro and glow RC engines.

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

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

The spring's role in tuning is to stabilise the throttle stop and provide consistent return force so idle adjustments remain predictable after repeated runs; it is not a service item for non-RC or full-scale engines.