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    2000 Yamaha GP1200R- Fuel/Air Issue?

    I pulled the fuel pick up today. The check valve was working well. I cleaned the lower screen and all looked good. All lines seemed clear. The fuel filter is new but is it supposed to be only 1/2 full? The fuel pumps were rebuilt when the carbs were re-done a year ago so I don't think they're...
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    2000 Yamaha GP1200R- Fuel/Air Issue?

    Those are all great suggestions. I'm going through it this weekend. I hadn't thought about the vent. I'll double check the fuel filter too. It most def is starving for fuel only at the upper end. The primer was put on this ski many years ago along with Riva cylinder kegs, d-plate install, oil...
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    2000 Yamaha GP1200R- Fuel/Air Issue?

    I'll give that a try. Going to be a couple months before I can test it though. I'll write back then.
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    2000 Yamaha GP1200R- Fuel/Air Issue?

    Yes I think it seems to be starving for fuel. Where's the fuel pump located? The filter is brand new. Next I could check the lines and pull the tank. Is that very difficult ?
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    2000 Yamaha GP1200R- Fuel/Air Issue?

    I have 2000 GP1200 that has Riva modifications on it. The issue I'm having only occurs above 4500rpm. It starts fine using the added primer and runs and accelerates perfectly at lower rpm's. My issue is that at WOT it will cut out and re-catch around 4500-5000rpm. Last winter the carbs were...
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