Here is an update that may be helpful to others who might experience a miss in their WG-600. I had a similar issue with the engine missing after working under load for a bit.
I replaced the ignition coil with this one from Advance Auto:
https://shop.advanceautoparts.com/p/...9-P#fragment-1
It helped with the mis some but it was still there. So I then considered that vapor lock might be occurring. So, I wrapped the fuel line with foil from the fuel pump to the carb and from the fuel pump back to the fuel filter. Bingo! No mis whatsoever.