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On the old PANTAHS, one of the windows was used with a timing light for ignition timing.

Maybe the same deal with your Monster?
 

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That's not a Window - there's a hole in the crankcase where an errant rod punched its way through. That was what that "knocking" noise was.........:-o
 

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The glass on the left side is to see the TDC and timing marks on the edge of the flywheel. You'll see a little oil on the flywheel or the glass from time to time.
 
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