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Straight pipes will change the whole balance of the fuel system. The carburetor requires a certain amount of back pressure to work properly. If the original muffler has been replaced with straight pipes, then that changes everything. The jets in the carb itself will have to be resized and it is something I have not done but use the search engine on this site, as I believe there are a few threads on it where others have done this procedure. Sorry I can't help more, but you should be able to find that info here. Also, talk to someone at your local bike shop and they can probably explain it better than I.
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