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I have a 1987 mercury 9.9 outboard drive problems

I have a 1987 mercury 9.9 outboard on a 12' boat. As I was towing my not-so-good sailor/daughter's sailboat to shore with it, I increased throttle speed a bit and the engine revved high with no power to the propeller. Got it to shore OK after that at lower speed. Next time I used it the engine started & ran fine, reverse worked fine but at above 1/3 throttle I get high revs but no power to the prop again. Below one third throttle the prop can push the boat. The lower housing grease seems fine (except for some red spots in it and the prop did not seem loose when I pulled on it by hand.Have not

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Engine: 1987 Mercury 9.9 HP (210 CC Sailpower ML)


This 1987, 9.9 hp Mercury is made for saltwater. This outboard engine weighs approximately 71 pounds. It has 2 cylinders. The pistons have a 12.8 displacement.
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1987 9.9hp 2 cyl mercury outboard - My Fish Finder


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Research 1987 Mercury 2-Stroke Series 9.9ML Outboard Motors, prices & specs at NADAguides
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