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I have a 2004 vulcan 750 and backfire is a normal thing for it as it was rebuilt. Ive been riding ut for a good 4 or 5 months almost daily but today it fired loud upon starting and a little smoke exited the exhaust. At first, it would stay on for a quarter of a second at a time before it went back to the starter power, but after a minute of turning over thr engine/starter over, it wont stay on at all. And it's leaking the smallest bit of oil on the exhaust pipe. I'm assuming its internal but any advice?
 

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A rebuilt motor backfiring means someone did something wrong. It is not normal for any bike to backfire.. The main reason that happens is that the engine is running lean and unburnt fuel is detonating in exhaust. This condition destroys the exhaust valve and can burn the valve seat out and crack the valve head. Look at the spark plugs, that should tell you which cylinder is having the problem. Be ready for a top end rebuild, and do the whole upper engine. The newly rebuilt motor should not backfire, unless you have some kind of wonky after exhaust that the bike is not properly adjusted for. You could have blown a valve intake seal which is pouring motor oil, but that usually goes into the combustion chamber. IMHO, the engine has to come apart. :)
 
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