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The Dude That Rides
2007 Honda VTX 1800N1
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There are a couple issues that can be the root cause. One is carburetor related. The factory carb set-up is a bit lean because of the EPA regs and that can fixed with the correct jets. Another is a leak between the exhaust and the head. Many times folks do not notice the old exhaust gasket when they change pipes and end up putting a new gasket on top of the old one, which is a no-no. Have you changed the pipes? If not it could still be leaking and you need to check the nut tightness. More than likely one of those is your issue.
 
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