SOURCE: Honda gx390 has low power.
Well it sounds like you may need new piston rings or an engine rebuild due to low compression. But a good way to tell if you need an engine rebuild is to test the compression and see if it is up to spec. You can often just feel that the engine is very easy to turn over which is a good sign that you need a rebuild.
Testimonial: "Thanks for the input Mr. Fraser, I am certin it is a compression problem. I didn't think about smelling the engen oil for gas, I will do it tomorrow. Still looking for the compression psi. More or less I think I need to grab a shovel and my metal detector and serch for my coffee can bank. "
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