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Message: [QUOTE="fmfracing212, post: 941074, member: 60112"] my 87 cr 250 is fouling plugs often and runnin like crap at 1/4-1/2 throttle.once i get past 1/2 throttle it hauls ass but at the lower rpms it wants to bog and fouls plugs if i dont keep the rpm's up.It is completely rebuilt so i dont believe it could be the right side crank seal making this problem happen.the first day i went out and rode it the bike ran great no problems at all.but the last 2 rides it has just been runnin like crap.i think it might be the needle and seat but im not sure. thanks [/QUOTE]