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I have a 04 900 that has one piston fouling out whenever I get on it. Okay at 1/2 throttle or less. Only when under load. So if flat trail, then usually doesn't foul out. Only climbing, off trail, or blipping the throttle. Have friend with same sled and his never fouls out under these conditions. Completely stock except for riser. I switched spark plugs wires & coil & injectors. Still does it. I ohmed everything that you could ohm and everything is within specs. It used foul out on one side of coil but when I switched coil, it is more random. So I am thinking either ECU or stator but leaning stator. My guess is that the stator is not supplying enough watts to spark both plugs and can only do one. Does this make sense because I have been trying to diagnose this for quite some time and no luck. Stator looks good but heard that these things can go bad only when hot. Anyone have this problem and can offer any help?