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Having a fuel issue? I think.
New fuel pump, carb has been gone through, starts and runs great for about 5 min then dies and plays hard to restart, come back 20 min later--starts right up. Any Ideas, anyone had this issue before?
 

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are you sure the fuel is reaching the carb ?, as in..sure the fuel pump is working at all ?. fuel cut-off relay is very common part to fail on these models. when it runs next time, and stops, pull the spark plug, plugged into the boot, lay it on engine, crank it over, and make sure its getting spark ?. if it is ?, then its a fuel issue. is fuel pump from amazon ?, if so ?, its junk !!, china knock-off part, buy oem from honda, those fuel pumps from ebay and amazon are cheap azz china knock-off pumps for like..20 bucks ?..not worth a penny in my book !.
 

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also, battery must be fully charged and in good working order for that year !.
 

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There were no TRX350D Foreman models produced until 1987. If yours is a 1986, it is a TRX350 Fourtrax. The ignition on the Fourtrax models were all AC-CDI, so none were dependent on the battery for spark. The fuel pump and relay require a good battery though. Like shadetree advised, if you have a china knockoff pump on there you wasted your money and time. Also the carb on those must be set up exactly as the service manual states. If you put china carb kit parts in it you'll need to put the originals back in there and make sure you didn't skip any of the reassembly and setup steps in the manual.
 

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I second the suggestion on checking for spark after it dies. Your symptoms lead towards fuel delivery, but verifying spark is so quick and easy it would be negligent not to start there. Divide and conquer!
 
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