After overhauling GX140 completely, won't start

[veryrealman]

Thanks for this info!

But it turns out it was my bad. I still had the cutoff switch engaged at the handled bars.
So I get great spark now.

Honda have many factories in China and source a lot of parts from China.
Honda have excellent quality control so reject sub standard parts
Guess what happens to the sub standard parts ?
They get sold at auction, bought by general trading companies then resold on line .
When buying aftermarket parts they must be branded, be packaged in a branded box from a company that has a real physical presence in your country.
I could list hundreds of cases where people have come in with a defective "brand new" aftermarket part.
Stihl ignitions are notorious for working when first installed then slowly fading away to nothing.
Get a new one from some one like Stens, Rotay, Prime Line for aftermarket guaranteed parts or real a real Honda one.

They have a chip in there which is sensitative to heat and several soldered joints which are also heat sensative to heat

If the coil has been touching the flywheel while running then it can get hot enough to go bad.

 

[veryrealman]

Folks, after getting good spark, it still wouldn't start even with starting fluid.

So I checked the compression again and it's bad.

What actually happened was I spilled most of the oil from the engine by mistake
while the valve cover was off.

So when I ran it several minutes, it burned up the piston rings.

That's also why it gradually was dying. I did cut it off when realizing that.
So hopefully I killed it before anything else was damaged.

I ordered new rings that will arrive Thursday.

It seems that it was all ready and working perfectly after changing the spark
plug but the lack of oil and possibly the exhaust valve rocker coming loose
killed it again.

When the rings arrive, I'll try all this again.