Motorcycle Repair: Starving for fuel, random problems, full tank

Question
I have a 1995 Nighthawk 750. I can be driving and all the sudden ona full tank or not itl just randumly bog down and die, where then i have to sit and use the choke to even get it to start back up. I road it 117 mile swithout it doing it, 50, 80 its completly random. I have changed the fule filter screne, the Vacum part on the petcock and im running out of ideas? But it is starving for fule, do you think my ccarbs are bad but if they were they would act up more often and not so random i would have an issue from the start but thats not the case. Im dumbfounded, please help.

Answer
Sorry Travis, but my experience is limited to pre 82 Hondas so I can't give you a specific answer.  Based on your description, you are probably right it's starved for fuel. It's unlikely all four carbs are bad and the only thing that can prevent the fuel from getting in the carbs are the float needles.  Those wouldn't all go bad at the same time. There are only two systems that can effect all four carbs at the same time.  The fuel supply lines including the vaccum valve and the fuel tank vent.  I've never seen a tank vent go bad but you've checked the lines.  If you pop open the tank cap will it start up without the choke? Does the tank sound like it under a vaccum when you pop open the cap? Also if you are careful to shut the fuel valve off every time the bike is shut off, you could by-pass the vaccum valve and run fuel directly to the carbs to see if it makes a difference.  Be warned the vaccum valve is there to prevent fuel from dribbling into the cylinder when the engine is shut off.  If the cylinders get enough fuel in them, it can hydraulic lock and bend a rod when you try to crank the engine over. This woudl be bad!! Process of elimination is about the only way to find these random problems.

Let me know if this doesn't help and I'll think a little harder.

Good luck
Rich