Seen this exact same issue.. the float inlet is likely sticking on one carb. the bike starts and runs on the fuel in the float bowl..then starves. I ran a few tanks of fuel with SEAFOAM additive.. solved my issue. I was able to free up the float inlet sometimes by rapping on the carb..or it would clear by itself. Check next time it runs.. is it just warming up?. or running just long enough to run the float bowls dry?. Maybe on 2 fresh starts- let it idle and time the point the cylinder drops out. If its the same time.. -It likely confirms
Sync the carbs especially if you have a custom pipes, in that case, the front cyl. is not getting enough fuel and is overheating.
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