So its not the easy solution.
The bike seems to be running out of gas. next time the bike stalls remove the fuel line to check if there is flow, there could be a blockage at the fuel valve screen in tank. if you remove the valve it's best to replace the gasket and washers to prevent leaking, only a few dollars from yamaha.
If you have flow from the tank the blockage could be in the inlet of the carburator, needle seat screen.
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Winston
85 xt600Z
02 YZ250
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