Yamaha motorbike dies when engine is revved up?

the problem is most certainly fuel starvation and is more than likeley to be a problem with either fuel flow or a blocked jet or two in the carburettors.i would try and undo the fuel cap incase its not breathing properly and creating a vaccum.then i would check the fuel flow o+ fuel tap + pump then the carbs.

adam bike doctor
July 2010