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Going back to what we found on the 9.5 … I used a dial indicator to , found that there was .013 lateral movement . Consider that the point gap is only .020, if the cam in moving .013 sideways that will change the gap from .007 to .033 .
As for the timing light, it’s just the old fashioned flashing light that one used to set timing on cars back in the days of distributors. Obsolete technology like dwell meters… Common at garage sales for a couple of bucks.
There may be a video somewhere on using the light to set / check point gap ( timing ) on your outboard.
If you have the July 2025 issue , read the story , better explanation of what we found. And it remains a mystery as to why only affects the lower cylinder.
Joe B