yfzrider25 Posted April 8, 2005 JD, I have a yfz450 that I cant get quite right. I have tried many needle and jet combos but still have a rich condition at one particular spot. At light throttle low load, like 1st gear just off idle I get a rich studder. It is not detectable when riding hard, just when returning to the truck. I am beginning to think it might be the the exhaust. Have you had any problems with pipes causing flow disruptions at certain rpms? Share this post Link to post Share on other sites
