Tohatsu 115HP | MFS115AETUL

Boaters who need the extra reach of a 25-inch shaft will find it on the Tohatsu MFS115AETUL, which otherwise shares its 115 HP four-cylinder engine with the rest of the MFS115 range.

Why shaft length matters here

Mounting an outboard with the wrong shaft length changes how deep the anti-ventilation plate sits, which affects cavitation, steering feel, and how cleanly the propeller bites; measuring the transom before ordering avoids guessing between this build and the shorter option in the same model line. Remote mechanical steering and electric start are standard, with power trim and tilt run through the same 12-volt system as the rest of the engine.

Shared engine technology

This is the familiar MFS115 EFI powerhead at 1995cc with a 4-2-1 tuned exhaust for stronger acceleration out of the hole and an easier run to top speed, a 2.08:1 gear ratio for added low-end pull, and fresh-water flushing for simpler rinsing of the cooling passages after a trip. A 41-amp alternator covers the charging load, and Tohatsu's five-year warranty applies to the engine.

Common questions

How do I know if I need this longer shaft instead of a shorter one? Measure the boat's transom height and match it to the shaft length Tohatsu specifies for that measurement rather than guessing from horsepower. Is the gear ratio different from the shorter-shaft version? No, both run the same 2.08:1 ratio.