pull them out, carb clean and scotch brite. no matter what oil you use, if you dont clean them at 500-1000 miles they will be ugly. there is a how to on clean and adjustment on the tech pages. after you do it the first time they are really bad you'll never let them get that bad again. some swear by using yamahas ring free product in the fuel, i cannot say if it works as i have never tried it i just clean them several times a year. ski