They are a very cheaply made part. They have a heating element that heats a wax like substance. The wax then expands, pushes the needle down which closes of the enrichment circuit. When I bought my HH it was bad and the one that I replaced it with died in a very short time. So I took it apart and drilled and tapped a hole in the top. Now I use a bolt and lock nut to turn the choke on and off. Of course I have to do it from the back of the buggy, but I have found that I only have to do it for the first start of the day. Well worth the effort IMHO. Because now I know that my choke is fully closed and I can jet it accordingly.
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2005 Hammerhead 150
170cc BBK, PnP Big valve Head, A12 Cam, Uni Filter, Custom Exhaust, 10G rollers, 1500 Contra Spring, 2000 Clutch Springs
Just added - 2007 Joyner 250 SV - Let the fun begin
4-Dirt Bikes, Baja Bug and enough toys to keep me in the garage and out of trouble.
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