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Message: [QUOTE="Yzf 400 rm 250, post: 1433648"] Hey guys I have a 99 yzf 400 that I bought cheep cuz it didn't run at the time. It has a brand new cylinder and head new plug the carb had been cleaned so you would think it would run... No it starts but won't stay running I've have had it idling but when I have it gas it would bog until high throttle so I adjusted the fuel air screw and now it won't idle! A little gas drops out the overflow so I'm lost I just can't figure it out!! Please help!!! [/QUOTE]