I have a blaster with an aggressive trail port, cut head, lightened flywheel and counter ballance shaft, boysen reeds, fmf pipe and silencer. I was considering getting the stock carb bored but after some reading I think I'd rather get a pwk 28. So my question is, are all the pwk 28's the same? Or is there different versions? If so which one do i need, or what bike/bikes can I get a take off carb from, and whats a decent price for a used one. Anybody have any luck with the Chinese ebay knock offs? Thanks guys