I have a 2002 Yamaha xvs 650 dragstar classic that seems to run fine until it warms up then it start to misfire and chugg along. i have already replaced the manifolds between the carb and the engine block.does anyone know what the problem is.
First I would change all the spark plugs, and if that didn't make a difference then it sounds like the coil(s) are warming up and breaking down........when it starts to skip take a good pair of pliers with good rubber on them and pull each spark plug wire, when you get to the one that the running doesn't change then I would replace that particular coil
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