My Yamaha 650 motorbike starts with choke pulled. But it dies when I try to rev up engine or press back the choke. What could be the problem?

Al, July 2010

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