Lightweight alloy needle valve adjusting arms suitable for use on OS & YS engines from 37 to 90 size.

Available in red, blue, purple and silver finishes these arms provide an easy visual reference of needle valve position. On twin needle engines such as the OS 91 SZ why not use different colours for mid-range and top-end !

Supplied one piece per pack together with lock washer and special 2.6mm socket screw as used on OS engines