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Well Mr. Rudderless, I believe that you get the gold star. Friend Mark and I have been fighting this for the last several days, in and out of the test tank, flywheel off and on, new points and still the same issue. Points all set perfect “on the marks” , good spark when pulled over. But when we start it in the tank, the top cylinder cuts out at low and medium speed. At high speed we get spark, but the timing light shows timing bouncing all over the “marks” . I finally put a dial indicator on the crank.. bad news .013 lateral movement… that is what is bouncing the points around. Funny thing is that it only affects the top cyl points , the lower cyl points consistently hold good to the timing marks???
The motor is a 1969 , Evinrude 9.5 HP “turtle motor” . The top bearing is a needle roller, I can’t image how that type bearing can have that much slop and apparently remain intact. I checked another similar power head and see only .003 lateral movement.
Joe B