Practical Sailor last tested four-stroke, 9.9-horsepower outboards in the June 2007 issue, with the Mercury 9.9 coming out the clear winner. These engines are well-sized for large, rigid dinghies or as auxiliary power for smaller keelboats, but their weight can be an issue. This report compares the Suzuki 9.9-outboard and the Yamaha 9.9 to the Mercury. Both the Suzuki and the Yamaha are carbureted, water-cooled engines. On-the-water engine performance tests found the Suzuki to be the loudest and the heaviest 9.9 we tested. The Yamaha is more compact, but at 91 pounds, it is no lightweight.