The PWK manual choke is the push in choke valve for PWK carburetors, the little extra step that gets a cold engine started. A plastic knob on top for a finger, a stepped plastic shaft, a hex nut and threaded section in the middle to lock it into the carb port, a metal spring, and a brass needle at the bottom. Pushed in, the needle narrows the path until the mixture lights; let go when warm and the spring returns the needle to the normal opening. It comes in blue, black and red, all the same part. Replace it when the knob will not stay down, the spring no longer returns, the tip is worn flat and the choke stops working, or the thread is stripped. Fit it with a clean thread, tighten the hex, and check that the needle moves freely and returns on its own.

 FAQ 

Q1: What is the PWK manual choke?

A push in choke plunger for PWK carburetors, a plastic knob, hex threaded body, spring and brass needle, fitted into the carb choke port.

Q2: How does it work?

Press the knob and the needle advances to narrow the air fuel path, so the cold mixture lights. Let go when the engine is warm and the spring returns the needle to the normal opening.

Q3: What colors does it come in and when do I replace it?

Blue, black and red, all the same part. Replace it when it will not stay pushed in, the needle will not return, the tip wears flat, or the thread is stripped.