YS Engine YSF9156 Carburetor Low-Speed Needle for .91 .120SC .140 Glow Engines  [YSF9156]

Low-speed metering needle for RC glow engines

This RC-scale low-speed needle valve serves as a replacement for carburettors that accept the YSF9156 needle type. It regulates the low-throttle metering passage used during idle and light-throttle operation on .91, .120SC and .140 glow engines.

Choose this part for service replacement or when precise low-speed mixture control is needed while tuning. The valve only influences the carburettor's low-speed circuit; slight needle movements alter idle mixture and transitional running, helping to reduce bogging and improve low-end throttle response.

Fitting is carried out at the carburettor low-speed needle seat and should follow the instructions in the engine or carburettor manual, with tuning performed in small increments while monitoring engine reaction. This product is intended for model glow engine use only and not for full-scale engines.