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something with spark plug

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I have an 03 RM250, and after just about every ride i keep having to change the spark plug, cause it goes out. I have no idea why:banghead: ...when i start my bike i turn on the choke and start it with a little bit of gas, then turn off the the choke in a little, then i give my bike gas and it dies, and i need a new spark plug:cry: ... anyone know wat the problem could be?

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What color is the plug ? What ratio are you mixing the gas to ? As soon as the bike starts I would turn of the choke and not let it idle for any length of time. Rev it up a couple of times after it starts to get it crisp in response.

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its an NGK and it is like black at the bottom, 40:1...and i have tried that, im really not to sure wat could be wrong

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