I have had a few and they had that number with out issue. Yamaha's love to get carboned up!! That's why they all say to use carbon free when you fill up.
I used a Sea foam treatment on one of mine, and saw the compression go up 10 PSI across the board. It would not worry me if the rest of the motor checks out.
Good Luck
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1986 V20 
Old Fishermen never die, we just SMELL that way!!
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