I'm trying to help a friend with his 03 750 vulcan. It hasn't been run in a couple years. So first thing I did was remove the carbs and cleaned them. Cleaned the jets, checked needles and seats. Replaced plugs with irdium plugs, have spark on all cylinders. Removed mouse nests from both air pods, there is no foam prefilter anymore.
Got it started, seems to start hard. It will not idle. 2500 rpm on up seems fine. Below that seems like I lose a cylinder and dies. Checked plugs, frt are fine, rear and black and soiled.
Questions: how important and the foam prefilters to it running?
Seems like a carb sync problem potential, agree?
Anything I'm missing?
Never got into a vulcan before so any insight would be greatly appreciated.
Thanks for the help