I have a kxf 250 2007 and when the bike bike hot it starts to miss spark and back fire and its not the engine or cdi or coil what else could it be?
Bad spark plug, tight valve clearances,short in key switch or kill button, blocked fuel filter (There is usually one inside the tank on the fuel tap pick up)
SOURCE: 2007 KXF 250 electrical problem
when the ignition parts like the coil and the transistors in the cdi unit gets warmed up they dont work as well as when there cool,,,so a problem thats not there when cold will be there when its hot,,,,if the stator has a small fault in it when cold when it gets hot it turns into a big fault! the best way to find this fault is by swoping one part at a time till you fine the faulty part,,,or put it into the bike shop and pay through the knows for the fix? have you a friend with the same type of bike you could swop the parts with??? it a big big help if you have! i would start with the coil then the cdi unit,,,there the most likley parts to play up when they get to hot they go faulty!
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I have had carbi clean out and new spark plug, valves checked, new kill switch, could it just be a faulty wire, or is it the stator? Why is it only when the bike gets hot?
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