I have a 60 hp 2005 Yamaha 4 stroke that stalls every time on the first start. Much stuttering and shuddering and then stalls. Starts easily 5 seconds later and continues to run. Have primed with squeeze bulb to no effect. Dealer doesn't like to service motors bought out of town even though he has never carried one. New dealer. I have the factory manual. Any suggestions? nevjb