This is a Wassell made throttle needle for the 6 and 9 series carburettors, for 4 stroke applications. Before buying, please check your needle jet. The early ones were plain, while the later ones were cross-drilled (two small holes on the hex of the jet). This throttle needle is suitable for use with the later cross drilled needle jets, part number 622/122. It is not suitable for the earlier models without the cross drilling. This needle is a replacement for original part number 622/124.