hey guys, today I took my 2003 KDX out trailriding and noticed that it acted like it was misfiring and there wasnt much power in 1st and 2nd and some of 3rd gear. when i got home i decided to check the spark plug. to my surprise after i pulled it out, it was completly black with some oily gunk/sluge on it. What do I need to do to get my bike running back like normal I just bought this bike used 1 week ago and now it is doing this. I hope this doesnt mean that I need to change my top end. Please help me out with this problem. Also when the engine is running what is it supposed to sound like? Mine kinda sounds like a knocking noise. I really hope this is not a major problem and hope that it is only my spark plug. let me know as soon as possible.
-Paul Graham
-Paul Graham