It looks like anything is possible from what you said. I know that knock was very noticable, but it's gone now. I doubt there's a hole in the piston or anything else because it runs pretty well. It just has that vibration, which I suppose could be a bent valve. Like you said, I need to do a compression check.
I noted that from some of the archived replies on here, that some people have removed those screws thru the sparkplug hole using something with grease or gum on the end. I am assuming that would mean to get the piston to the top, right? How I'll know which cylinder it is, is another question, unless the plug shows damage. Guess I'll just have to play around with it and carefully look at everything in the process.
On the other hand, I am wondering if the vibration could be carburetor related. Seems that after I opened it, it needed quite a bit of adjustment. At first it was surging like crazy.
If the screw did blow out the cylinder and got into the exhaust manifold, should I run the tractor for a short while with the muffler off, so it comes out all the way? I'm sure it could not climb to the top of the muffler. It's no big deal to take the muffler off, because I never clamp it. (I cant get it in my garage door with the muffler on).
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