I have a 390 sib with a 20hp 2 stroke on it and I can say it's way more motor than I need. With 2 of us and gear I'm on plane almost instantly and I honestly don't think I've ever been past 1/3 throttle to cruise at 18-20mph. Any faster then that scares the poop out of me lol. That said I don't think I'd be happy with a 9.9....especially if it was a 4 stroke. I'm sure it would get the job done especially on smaller lakes but it would be working hard all the time.
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