detonation / knock issue on 340
Maybe, maybe not. I can tell you about mine. "All of a sudden" it started spark knocking again a while back. Not "as bad" as before I tuned it out. Guess what it ended up being? The carburetor had loosened up on the mounting gasket. To my stupidity, it was an old one I reused, so I got a new thick one and tightened it down good. Problem gone. So that tells you how "close" the tune is on mine. I just bet I could remove one of the plugs from an unused port on the base plate of the carburetor and it would start rattling again. It doesn't take much sometimes.
