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I have a 1978 yamaha xs1100 and I cleaned my carbs and bench synced them and when i put it all back together it started right up but was running pretty rough. i tried to sync them with a home made manometer and im not sure what i did but i cant get my bike started. do i need to take the carbs off and bench sync them again or is there an easier way?
 

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If all you did was remove the vacuum port screws and insert the adapters for the sync tool, I would say you introduced a vacuum leak. Go back through all the carb connections, and make sure that they are properly seated, and the fuel levels are good.
 

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yeah I agree with winter...
vac leak somewhere,

or you synched them with a bad vac hose....during synch.
 
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