I have 2 1999 Yamaha GP800's- One starts fine, the other will not start until you put starting fluid in the carburetor. It sounds like it is out of gas. Once started it runs fine, until it sits for 2 two or three hours, then it will not start. Put starting fluid in, starts right up. Been to the dealer twice with no help.
You could have a air leak in the fuel system.. Check all the fuel line fittings for leaks. Also, check your check-valves to make sure they are good. They should only blow one way. Also check your gas cap for missing o-ring & that it is not cracked. I would recommend installing a primer kit. It is better for your engine using starting fluid.
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