To find out, we engaged a leading builder of family craft, Chaparral Boats, to provide us with a pair of 21 H2O Sport runabouts powered by two of the outboard engine options available for this model — the base Yamaha F150 and the $3,900 upgrade, a Yamaha F200. Our test boats were otherwise identically optioned. With as-tested options, dealer prep and shipping charges to Park Boat Company in Washington, North Carolina, the MSRP with the Yamaha F150 outboard came to $47,370. The Yamaha F200 pushed the MSRP up by about 8 percent, to $51,270. Since its introduction in 2017, 75 percent of 21 H20 Sport models have been sold with 150 horsepower on the transom. Which, of course, runs contrary to conventional wisdom. So, let’s crunch some numbers.