Yamaha 425 HP V8 5.6L XTO Outboard
The XTO Offshore® is the result of years of collaboration with top boat designers, and has been built from the ground up to provide the ultimate in power and efficiency offshore. McMichael Yacht Yards & Brokers is an authorized Yamaha dealer. With a legendary 97% reliability, they’re one of the most trusted outboard brands. Yamaha combines reliability, durability and long range fuel economy throughout their award-winning outboard engine line.
Boats Powered by this Engine: 2019 Regulator 41
Award-Winning 5.6L V8 HP Outboard
With impressive stats such as 12.2:1 compression ratio for impressive fuel economy and power, industry firsts such as an electric steering system, it’s purpose-built for extreme power, durability, control and reliability.
- NEW Phase Angle Control Charging System* an award-winning industry first
- 425 hp on less-expensive 89-octane gasoline
- Compatible with Helm Master® EX
- Prop Shaft Horsepower: 425hp at 5500 rpm
- Displacement: 5.6L
- Full Throttle RPM Range: 5000 - 6000 rpm
- Starting System: Electric
- Gear Ratio: 12:2:1
- Alternator Output at WOT: 100 Amps
- Weight: 952 - 999 lbs
- Shaft Lengths: 25", 30", 35"
- Recommended Fuel: Octane 89
- Power Trim: Yes
- Engine Type: V8
- Warranty: 5-Year Limited
- Fuel Induction System: EFI
System Integration
Digital Electric Steering
The XTO responds quicker to steering inputs because it contains a digital electric steering motor, which directly receives signals form the electric helm to the integrating steering control unit.
Helm Master® EX
Helm Master® integrated boat control system offers greater control with Set Point™ and CL7™ Display
Power And Performance
Direct-Injection Four Stroke
Maximize power and efficiency by spraying fuel at high pressure directly into the combustion chamber.
Exclusive Fuel System
A three-stage low-medium-high pressure fuel pump system works, in part, due to two independent, rpm-activated fuel pumps in the Vapor Separator Tank. This unique five-ump system creates an unprecedented fuel injection pressure of up to 2900 PSI to further maximize atomization and efficiency.
In-Bank Exhaust
Intake tracks enter the cylinder head from the outside of the powerhead. This gives exhaust gases room for a direct route to the lower unit and out through the propeller hub, streamlining the powerhead and improving flow.
XTO (SDS) Propellers
With diameters from 16 to 17 1/8 inches, 15 to 27-inch pitches and increased blade surface, XTO propellers complement the torque potential of our V8 XTO Offshore. They also contribute to greater overall thrust.
Endurance-Driven Camshafts
The XTO features dual overhead camshafts that are each connected via a self-tensioning chain immersed in an oil bath and utilize one-sprocket belt engagement. This ensures quiet, precise valve-timing, compact design, low maintenance and long life.
Two-Stage Water Pump
This unique design ensures proper cooling water flow at all RPMs and improved temperature control. It features a massive rubber water impeller for high pressure and flow, and a steel impeller that helps provide sufficient water volume, even under the most extreme offshore conditions.
Maintenance Videos