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Message: [QUOTE="bmoore4w21, post: 913964, member: 60903"] Well, I just bought a used 01' KX 250. The bike is almost 100% stock and appears to be in excellent shape. From what I can tell no engine work has ever been conducted due to the perfect shape of all bolts and screws in and around the engine. With that said, I just recently took it out for my first ride. I had ridden it for about and hour and a half when I went for full throttle up a gradual incline. This is when the engine failed. It sounded as if I had forgotten to turn on the fuel. However this was not the case. I changed out the spark plug and replaced it. Once again I was off and the engine started on first kick. Later on the same thing happened again. I'm not an expert but I know that this is not normal. I have read some threads and responses about jetting and other plugs. But I don't know exactly what should be the first step. I guess I should also mention that I have been putting in Champion plugs that I bought at the local Autozone. They were crossed referenced with the original NGK plug that was in it. I'm not sure if maybe I need some different plugs or if the jetting needs to be changed. I also noticed that the articles about jetting ask about the top end being worn and the piston rings being shot. I'm not exactly sure how to determine that as well. I also am using a 40:1 fuel mixture with some special Bel Ray oil that was recomended by a follow KX 250 rider. Please help me on this one because other than this little problem I had a great ride. [/QUOTE]

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