> Mercury outboards were truly 16 horsepower were rated at 10 horse to power the fastest boats on the lake.
Outboard manufacturers produce more than one horsepower rating for each of their motor displacements. Or at least they used to. I had a 140 Evinrude which was nearly identical to the 120. Checking the parts manual, I found all parts were identical for the two motors EXCEPT for the carburetor bodies. So the 120 was truly a derated motor with a smaller carb that limited the horsepower. Of course, the 140 was significantly more expensive than the nearly identical 120.
The "9.9" hp motors produced by various manufacturers are a special case: Many lakes restrict outboard motors to less than 10 horsepower, so the outboard makers started derating their 15 hp outboards to 9.9. I'm pretty sure they limit the horsepower in the 9.9s, lest they cannibalize sales of 15s.
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Today's Featured Article - The Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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