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When I had this problem I by-passed the tank and used a small tank of fuel suspended above the bike to gravity feed new fuel to the carbs. That worked and told me it was a fuel delivery issue. I serviced the pump with a kit (sold for a skidoo!) and also replaced the rubber pipe to the vac outlet of the carb manifold as that was perished. To get new fuel into the carbs I drained the old fuel using the drain screws on the bottom end of each carb before refilling using the small tank mentioned above. I actually took the tank off my lawnmower but you can buy a small device on ebay for a few pounds. Not sure where you can get the fuel pump service kit from nowadays but it is quite a common pump for snowmobiles, skidoos etc. Got mine off ebay back in the day. I know some owners have replaced the vac fuel pump with an electric one from I think Yamaha.
Dennis
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