- Nov 2, 1999
hey guys i just bought a new 04 yz 250 and ive already foulded two brand new plugs riding around in front of my house here in Kentucky (elevation 1200 ft. temps about 50 degrees). What happened to that yamaha jetting being perfect? My new bike says NOT. Everything on the bike is stock....My cr 250 (99) ate plugs until i leaned the jetting considerably. I leaned the needle one clip on the new yz. I hope this cures the jetting problem. I thought i was getting rid of the jetting nightmare when i bought the yz...but at the present time it doesnt seem that way....any hints or advice on this bike's jetting would just make my day...