yamaha 650 waverunner , weak spark wont fire?
 
                bought used. coils been replace , new plug wires , new spark plugs, took out plug grounded to block sparks but looks real weak ? also battery weak ? please advise, I was wondering if battery could be given the problem, but I also used a jumper didnt seem to help.
            
             Don Sargent
            
 July 2010