Throttle Stop Spring 160 for YS Engine Throttle Assemblies – YSF1259  [YSF1259]

Replacement stop spring tailored for YS Engine setups

The YS Engine YSF1259 throttle stop spring 160 is a replacement coil engineered to provide a defined stop and reliable return force within throttle linkages used on YS Engine throttle assemblies. It supports predictable idle settings and enhances throttle position consistency on nitro and glow RC engines.

Compatibility is focused on YS Engine throttle assemblies and matching idle linkage configurations that specify a compact stop spring. Confirm the throttle housing and linkage layout before purchasing. The item is sold as a single spring for hobby engine maintenance and tuning use.

Fitting is routine for an experienced modeller: remove the throttle cover or retaining clip, observe the original spring orientation, transfer the new spring to the identical mounting points, and verify idle stop and throttle travel before initial operation. Complete a final tuning check with the engine at operating temperature to ensure correct adjustments.

In tuning practice, the spring helps to stabilise the idle stop and deliver a consistent return force so idle adjustments remain reliable after many runs; it is not intended for non-RC or full-scale engines.