YSF1259 Throttle Stop Spring 160, compatible with YS Engine throttle assemblies  [YSF1259]

Small spring, big effect on idle stability

The YS Engine YSF1259 throttle stop spring 160 is an RC replacement spring designed to give a defined stop and steady return force in throttle linkages paired with YS Engine throttle assemblies. Though small, it is important for setting idle stops and improving throttle position repeatability on nitro and glow models.

This part is compatible with YS Engine throttle assemblies and the corresponding idle linkage layouts that call for a compact stop spring. Verify your throttle housing and linkage arrangement before ordering; the spring is supplied individually for hobby-grade engine maintenance and tuning.

Installation is quick for experienced hobbyists: remove the throttle cover or retaining clip, note how the original spring is mounted, fit the new spring to the same anchor points, and check idle stop and throttle travel prior to running. A final tuning pass with the engine at operating temperature is recommended to confirm settings.

Functionally, the spring stabilises the idle stop and provides a repeatable return force so idle adjustments remain consistent after repeated runs; it is not intended for full-scale or non-RC engines.