when the bike is in between idle and 3500 rpm it sounds that it is only running on 3 cylinders.but after 3500 rpm and beyond its fine, i checked the coils , plugs ,throttle bodies,and as much of the wiring as possible without removing the entire harness.my buddy told me that it could very possibly need a valve adj. cause that 1 cylinder the valves arent seating totally causing low end lose and low compression in that cylinder at lower rpms .anybody had anything similar to this happen or any advice on wat may be the problem.

 

compression test it... valve problems dont go away in higher rpms neither. get the throttle bodies sync'd at 3500rpm...

 

if you have a power commander, take it off. i had similar problems, but fixed itself when i took it off.