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KX 250 plug fouling


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I have an 03 kx 250 it ran gr8 till last week. Nowit is fouling plugs like a banchee. It has 200 psi comp. carbon reads not cracked, pro circut exaust, 32/1 93 octane, Br8es, Klotz oil. What do I do from here, Cleaned the carb, exaust valves not sticking. ?????????

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  • 2 weeks later...
I was having the same problem. I bought a hotter plug. Gonna see if that works.

Usually when something like what the OP described, something broke (i.e. seal, float seat, ignition etc.) although it could be the weather change, but every KX250 I had was pretty impervious to weather changes. I know I probobly should rejet for winter and summer but I don't. Alot of times people will try to fix something like a crank seal with jets, different plug, reeds, etc, and that won't cut it. If it ran great before then something is wrong.

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