Tough without seeing it but it could be fuel related,, is it running out of gas.?? when it dies how long do you have to wait before it starts. it could be coil getting hot and shorting there are just so many things ,, see if maybe your fuel pump is running out then it sits and runs agin also try taking your gas cap off and see if that does anything, also as soon as it dies try to see if you have spark really quick , just use a spare spark plug and leave your plugs in that way you can do it real fast.
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