Larry, 9.9 on a boat rated for a max of 15 is about 66% of max. That's good info.
The 2 cycle engines seem to use the same block for 9.9 and 15 hp. The 4 cycles use the same block for 15 and 20 hp. Your 9.9 2 cycle weighs about 30 pounds lighter than a 9.9 4 cycle. Probably wouldn't have much performance difference but the 4 cycle is more likely to hurt you when you lift it off!
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