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The irregular knock, is why I'm thinking it is not mechanical. Reeds hardly ever break unless they have been weakened by salt corrosion. Sounds like an ignition problem. I know you put new plugs in.Could one have been dropped. Did you disconnect any linkage to the throttle timing control.
You can check compression on the bench just keep the starter on the powerhead and remove all the plugs so it turns over easy, a few bolts to the bench wouldnt hurt either.
I'll check around and get back to you on the powerhead.
I had an engine on the stand last winter ready to tear apart and when I went to remove the flywheel it was loose. I had run the engine it sounded like everything inside was ready to come apart. The flywheel moved a couple of degrees if that.
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