YS Engine YSF9156 Low-Speed Needle Valve Compatible with .91 .120SC .140 Glow Engines  [YSF9156]

Needle valve for precise low-throttle metering

This RC low-speed needle valve is intended as a direct replacement for carburettors that accept the YSF9156 needle form. It manages the low-throttle fuel metering circuit during idle and light-throttle operation on .91, .120SC and .140 glow engines.

Fit this part when refined low-speed mixture control is required or when carrying out a service replacement. The needle's small adjustments change idle mixture and transition behaviour; correct tuning reduces low-throttle bogging and improves throttle response in the low rev range.

Installation is carried out at the carburettor low-speed needle seat in accordance with the engine or carburettor manufacturer's instructions, and tuning should be incremental while observing engine response. This item is for RC model glow engine use only and is not suitable for use in full-size engines.