Thanks Dave, I bought a chinese one and it is awful. I had to die grind the body to allow the nuts to go on, I also had to replace one of the jets and idle screw with the original parts so it would actually work.

I still can't get it to run right, when I slowly roll on the throttle its okay when I roll on the throttle fast it hesitates. Do you think this is a rich hesitation? Should I disconnect the accelerator pump arm and see if that helps to eliminate the problem?

Is the jet at the bottom of the fuel bowl responsible for the 'dose' delivered from the accelerator pump? I'm thinking it is delivering too much fuel when it pumps.