If it aint broke and is running fine then you don't fix it! Usually from the factory they are adjusted far too lean just to pass the emissions tests and particularly in Ca. and Az.. If your plugs have a sun tan white boy color and they run smooth then leave them alone. Yes, many have found that the pilot screw out between 2-2.5 turns is the sweet spot but just as Rocky said, they are all not created equal.How do you guys feel about carb mods and the warranty? Run it factory for a year out jet and shim now?
We will all be very interested to here the autopsy results once your dealer gets to the bottom. Hope you do have an honest dealer who will stand behind you. Mine here would absolutely turn this repair in for the warranty reimbursement from Yamaha and then try to run some crap on me that I over revved it and it was my fault as he hands me the bill. That is why I would not give this dealer the sweat off my left peanut. I was the GM at just such a MC/ATV shop and told the owner to stuff it after 6 months because he had no business ever being in a customer oriented sales business.