Went to check the oil and , wow! A lot of fuel in there. I had the same issue with my Wagoneer where the float needle got stuck. I'm guessing that is the problem. I saw the #1 carb was full of fuel, as it was on the kickstand, which seems like an excessive angle.
Am I right the petcock is vacuum activated, no on-off, no prime, etc? My Ninja is vacuum activated but it does have a prime button.
Anything else I should consider?