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Yamaha’s F9.9 is hefty for its output. But if an engine has plenty of midrange torque it can easily overcome the weight issue. For example, despite weighing a whopping 50 percent more than Tohatsu’s discontinued two stroke M9.8B, the F9.9 outperforms this engine under similar test conditions while using way less fuel to do so.
On my 1988 3.6m Sea Al Super skua tinny, the loan F9.9 severely limited freeboard aft on this short shaft hull when at rest or trolling but once planing, the hull felt no different to having an M9.8B on the transom. Sure, more weight had to be placed forward to counteract the transom load but planing handling was no different.
With its traditional four stroke engineering, such as a one-piece crankshaft and capped connecting rods, the F9.9 is almost a
