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

Replacement stop spring for YS Engine throttle linkages

The YS Engine YSF1259 throttle stop spring 160 serves as a compact replacement component to establish a positive stop and return action in RC throttle linkages paired with YS Engine throttle assemblies. It plays a key role in holding a stable idle and delivering consistent throttle feel for nitro and glow engines.

Use is confined to YS Engine throttle assemblies and related idle linkage arrangements that require a small stop spring. Inspect your throttle housing and linkage geometry prior to purchase to ensure compatibility. This item is supplied as a single spring intended for hobby engine upkeep and tuning tasks.

Fitting is uncomplicated for experienced model technicians: remove the throttle cover or clip, note the spring orientation, move the spring to the corresponding mounting points, and validate idle stop and throttle travel before the first run. A tune check with the engine warm will verify final idle settings.

In tuning, the spring helps stabilise the idle stop and maintain a consistent return force so idle adjustments remain predictable after multiple sessions; it is not suitable for non-RC or full-scale engine use.