hey guys,
i noticed on my 2001 400ex that after about an hour or so of riding in pits or mx once and awhile it will blow some smoke out. its only on the revs and its a whitish/blueish color. it isnt always there only after some riding that includes up and down hills and stuff. it doesnt seem like performance is affected but when i think smoke i think engine rebuild and id really love to do without that. what do you think could cause this. im wondering if the air screw could have ANY affect on this because i had the quad jetted at 175main and 2.5 out on the air screw and decided to run with the airlid on. i rejetted to a 158 but never changed the air screw so im wondering if this could cause it. maybe valve seals or something? help me out i get worried when i see it, id like to know what it could be. thanks!!