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I just bought a 2007 trx 400ex , it fires up fine but it’s smoking from the exhaust header and also the carburetor. It will not keep a idle so I have to keep on the throttle for the bike to stay on . The guy I bought it from gave me a brand new top end which I plan on installing very soon. Should I replace the exhaust header and carburetor? Or just get the carb rejetted. Definitely need advise
