I measured the side of the carb that goes onto the engine itself. It measured to be about 36mm (after doing inches to mm conversion). Its a Keihin. So, if I have to buy jets for it, Id like to know what model, or at least what family its from. I am pretty sure my pilot jet is too high and my main jet is too low. I want to buy the correct jets and possibly a couple needles to play with, but I need to know what carb to buy them for.