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Yamaha did not make the GP model until 97 and if the numbers you posted are correct you have a 94, that being said all yamahas up until 93 were either a 500 or a 650 so im guessing its not a superjet which is a standup so you may have a waverunner 3, Raider, Blaster, or a wave runner LX. What colors are on it? does it have twin carbs? there will also be a sticker on the engine cases noting engine size.
your starter is shot more than likey try to jump the relay in that black boxs buy jumping the two post on that round relay if it does the same its the starter if it turns over its the relay or the start **** becareful jumping the relay no fuel around air bike out and you have to take off the exhaust manifold to get to the starter
Have you done a compression test on all cylinders? My guess is you have a dead cylinder (no oil to one or more cylinders causing loss of power). If the compression test passes (all cylinders equal and higher than 100-110 psi) you have a restricted exhaust from a failed catalytic converter that has broken apart.
what is it idle at? how much? remove your seat check air filter if is black oily remove it and see if that fixes your problem you may want to change your spark plugs as well # one cylinder may be starting to foul the new yamahas are the worst for fouling plugs use a cr8eb instead of the cr9eb the 8s are hotter and work better try those and let me know thank you
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