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Sailor, I have a 1989 SuperSport 15. I put an F70 on it the first year they came out, in 2010 (it may be newer than the F60, but it's not really new). I love the F70, especially since I finally found the right prop to run on it. I can't compare to the F60, as I have never run one.

I feel your pain regarding putting a motor on that eclipses the cost of the boat - pretty much everyone who repowers has that concern. It does not make sense if you look only at economics, but I can tell you the F70 is a wonderful motor - very reliable, quiet as can be, easy to work on so if you are going to be keeping the boat a long time, it's a good choice. The F60 would have those same characteristics. The price you were quoted seems quite reasonable; the $600 bump over the F60 is pretty minimal in the grand scheme of things, and is less than the typical $100/hp.

Regarding the grandkids running the boat, the 15 is a fast, bouncy, agile boat - a real sports car on the water. They'd easily be able to get into trouble with either the F60 or the F70, or really any motor. If you do go with some type of throttle stop, don't install it until you get to about 50 hours on the motor - Yamaha 4-strokes are best run hard during breakin to seat the rings.

Good luck! Please feel free to ask any additional questions you have.

Tim