Has it got an inline fuel filter? Perhaps the lean running is due to crud / rust in the fuel tank blocking the tank filter, and / or the in line filter.
If it has an in-line filter, replace it. If not, it might be wise to fit one.
Have a good look inside the fuel tank with a very bright torch, and see if there's any debris or corrosion in there.
Be interesting to know if there was anything in the carb bowls too.
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