I have one as well. Same problem and it got worse until I had to prime the carb to run. Fix is simple. 2 carb kits off eBay. Approx $30 ea new. Takes about 2.5 hours to do. I have never done before so I thought it was easy. What happens is the carbs have rubber diaphragms in them that act as a fuel pump. My old ones were really thin and worn. The new ones thicker and better. Put it back together and viola. It starts on it's own. I checked all forums about shut offs and external primers, pop pressure etc. Just rebuild your carbs. You'll be fine.
Before u go spending money on a bunch of carb parts you probably don't need in a kit that comes with pieces u will never have to use try taking the 90 degree rubber hose off the flame arrestor and sticking your hand over the opening of the hole to create a manual choke. With any mikuni carb that has been sitting for some time the needle and seat have a tendency to get stuck together. When u create a choke by blocking all air from entering most of the time this will create such a vacuum that it will free these parts from each other.
Clean your carburetors. Water can cause corrosion in delicate places like the needle assemblies. This cause the pump part of the carburetor to not function. lay an old bedsheet under the carburetors in case you drop small parts. The cleaning of the needle assembly can often be done with the carburetors still on the engine when you are working on a Yamaha.
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