As a data point for you, I have an 8hp Tohatsu carborated 2 stroke on our 11 foot bombard sport boat. I can plane it easy with my son and I (340# total body weight) and it'll do 17 to 20 mph depending on waves & wind. The motor weighs 55 # has been very reliable and always easy to start. I pluged up the water inlet and overheated it last year. The tell tale was blowing spoke for several minutes before noticed it and shut her down. I bought a new WP kit thinking I smoked it. I was surprised to find that it was found undamaged upon removal. I replaced it anyways as preventative maintenance. I was impressed by the amount of design margin the unit had given the abuse it had put it through. I bought the service manual which was very helpfull in performing the job. However, I had to read it forwards and backwards multiply times to understand it as the japanese translator must not have been very technially savy.
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