2.5 HP Tohatsu Outboards The 2.5 hp Tohatsu outboard motor is an excellent choice for square back canoes, small tenders and inflatables, and other small craft. The 2.5hp 4-stroke is light, compact and powerful boasting the largest displacement in its class (85.5 cc). Tohatsu outboards are salt-water rated and built to last — the 2.5hp is no exception to the rule. Quality construction and a long list of included features set the 2.5 HP Tohatsu outboards apart from the competition. Features such as full-size twist grip throttle, forward-neutral shift with 360 degree steering, and integral fuel tank make boating easy. The 2.5 HP Tohatsu is a short 15 inch shaft with a composite propeller and a manual start..