Compression test for outboard motor?

I recently ran a compression test for my 85 horse Mercury outboard motor. The motor is a 1973 2-stroke and the readings with this tester were from top cyl. to bottom - 80, 80, 90, 55. I was wondering what kind of problems to expect. This motor was run for approx. 1-2 minutes without water circulating and I know the impeller is shot but I am really worried about the motor. Thanks for the help.