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How many hours on it?? Yamaha's love to get Carboned up! You can get some De-Carb and do it yourself.
Also try like stated above get a 6 gal gas can and run freash gas and see if that is it. If runs good you may have a hole in the line letting air in or a O ring on the conector's of the hose?
Could be out of time also?? I had a friend that had one and it was fine at idle and troll, but do try to go anymore then that, it will spit all over the place!
Good Luck!! Let us know what it was??
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