Suzuki DF90A Four-Stroke: Twelve years after starting the four stroke revolution with its award winning DF70 and DF60 outboards, Suzuki is reinventing the category again with the DF90A. The first of Suzuki's new generation four-strokes, the DF90A is a showcase of advancements and achievements – such as digital sequential electronic fuel injection, a powerful 2.59:1final drive ratio,  zero-maintenance self-adjusting time chain and don’t forget the Suzuki Lean Burn Control System.  New DF90A models also sport the optional Suzuki Troll Mode System.