Same base engine The same base engine is also found in:
MFS40A, MFS50A and MFS60A share the same base engine
Tohatsu's owner's manual lists a four-stroke three-cylinder engine with 866 cm³ displacement and 70 x 75 mm bore and stroke for all three.
Differences according to the manufacturer Maximum output 29.4 kW (40 hp), 36.8 kW (50 hp) and 44 kW (60 hp) Same full throttle range, 5 000 to 6 000 rpm, according to the manual Official power upgrade: No official upgrade found
Law, safety and insurance
The boat must not have a more powerful engine than the maximum power specified by the boat manufacturer in the owner's manual or CE documentation. An overpowered engine can impair steering and buoyancy or damage the transom. Mercury operator's manual, boat power limit ↗ (external link)
Under the Recreational Craft Directive 2013/53/EU, increasing the rated power by more than 15 percent counts as a major engine modification, which requires a new conformity assessment before the engine is used. Directive 2013/53/EU, Articles 3 and 19 ↗ (external link)
If's boat insurance terms state that the boat must not have a more powerful engine than it is approved for, otherwise compensation may be reduced or denied. If boat insurance, terms section 3.3.4 ↗ (external link)
The warranty may be affected: Volvo Penta excludes faults caused by modified software or electronics, and Mercury warns that the warranty may be voided by improper use. Volvo Penta warranty terms, page 6 ↗ (external link) · Mercury operator's manual, warranty ↗ (external link)
Marinpedia does not publish instructions for unlocking power, as this can make the boat dangerous, violate CE regulations and affect insurance and warranty.