Guys, the best you can do with those PWK knockoffs is still very bad. Even if you spend time and money correcting defects, you're still stuck with needle jets (AKA "atomizers," AKA "emulsion tubes") that are too rich for 4-stroke applications, and no alternative sizes are avaailable. Return the carbs if you can, use them for paperweights (and desktop reminders to do your research before the sale, not after), and buy a pair of real carburetors. Gary's suggestion is a good one if you're lucky or know what you're doing, but when you buy used carbies there's always a possibility that Og the Cavewrench has been into them. For new gear, the least expensive and least troublesome carbs you can buy are Mikuni VM34s. There's plenty of information on these, so you can do some reading and find out what to expect (if you buy from a cheap source, what you can expect is grief and expense).