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this seizure wasnt from a kx but from a ktm 105. the crank bearing seized from to little lubrication and beign ran very hard in a race, so upon cutting the base of threads off spark plug to see the mixing ring at the base and to my supprise the whole porcilan was light brown and a small black ring at the base. from what i have studdied about plug reading if there is a black ring at the base of plug even if the rest of porcilan is solid white them its running to rich, well im second guessing this now. this bike was stock jetted altitude 2000ft 80degrees temp and 93 octane fuel mixed with klotz supertech at 32:1 and had no cooling failure, so apparently this wasnt running quite rich enough contrary to reading the plug mixing ring. the piston crown was all black no wash at all and the under side was burnt dark brown to black.