V6 OFFSHORE – 425 HP Yamaha Outboard


Years of collaboration with top boat designers has influenced the Yamaha 425 HP Outboard from the ground up to provide the ultimate in power and efficiency offshore.

With impressive stats such as the highest compression ratio on the water, industry firsts such as an electric steering system, and engineering touches such as iridium spark plugs and quad thermostats, it’s purpose-built for extreme power, durability, control and reliability.




Engine Type

V8 / DOHC / 32 valves / 4 Valves per Cylinder



Bore x Stroke

x 96 mm (3.78 x 3.78 in)

Prop Shaft Horsepower

425hp at 5500 RPM

Full Throttle RPM Range

5000 – 6000 RPM

Alternator Output at W.O.T.

Amp Gross, Max

Compression Ratio


Fuel Induction System

Direct Injection / Up to 2900 PSI


432 kg (952 lbs) / 443 kg (977 lbs) / 453 kg (999 lbs)

Recommended Fuel

Octane 89

Recommended Engine Oil

Yamalube® 4M

Recommended Fuel Filtration

Yamaha 10-Micron Fuel / Water Separating Filter (external)

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