There are a couple of things that can cause this problem. The first thing to check is if you are loosing spark. Dying after it gets hot sounds like to stater is failing in the engine. If you loose spark this is more than likely the issue. If you are not loosing spark you need to check the fuel system. Dying after 20 seconds it could also be a plugged main jet in the carb. Another common issue on Honda engines is a faulty vent on the gas caps for engines sold from around 2008 - late 2010. If your gas cap is only about 3/8" thick this is very likely to be your issue. Try running the engine without the gas cap on to see if it still dies. If not that is your problem.
Sincerely,
Aron Kerr
Landa Northwest
800.247.8103
503.255.6508
www.landanw.com
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