Keihin Needle Jet 4t

The small brass tube that sticks out in to the main bore of the carb, the needle moves in and out of this jet making it bigger or smaller, as a coincidence of this it can wear out requiring replacement.

It fits on top of the atomiser tube on the Sherco Prompt System (SPS) Keihin PWK 28 carburettor.

The SPS carburettor uses these special parts to give the carburettor a kind of accelerator pump, this helps to eliminate the slight hesitation that can be found on 4 stroke engines when the throttle is suddenly opened