Suzuki DF9.9B EFI X Outboard Motor. State-of-the-Art designs make the new DF9.9B most technically advanced portable outboard on the market today. This is the world’s first 9.9 hp outboard motor designed with Lean Burn and Battery-Less Electronic Fuel Injection. The Suzuki EFI system operates Battery-Less, which is an industry first in this horse-power class.