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Message: [QUOTE="cowasucky, post: 1370759, member: 103270"] My 03 kx250 had smoked like a mesquito sprayer and ran a little sluggish. After reading so many posts about how the 03's are stock jetted really rich, I dropped the pilot and maine one size each and the result is amazing!! The smoke is gone and I can't shift gears without the front tire raisin' up....I love it !!!! But how do I know it's not too lean??? I mean it runs better than any bike I've ever had, but that don't mean sh*t if it locks up the first good, hard ride. [/QUOTE]