5.6L V8 425 HP

5.6L V8 425 HP


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. 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.


  • NEW Phase Angle Control Charging System* an award-winning industry first
  • Available in signature Yamaha gray or new pearlescent white
  • 425 hp on less-expensive 89-octane gasoline
  • Compatible with Helm Master® EX
  • Impressive 5-year Limited Warranty, for pleasure use
Engine TypeV8 / DOHC / 32 valves / 4 Valves per Cylinder
Bore x Stroke96 x 96 mm (3.78 x 3.78 in)
Prop Shaft Horsepower425hp at 5500 RPM
Full Throttle RPM Range5000 - 6000 RPM
Alternator Output at W.O.T.100 Amp Gross, Max
Compression Ratio12.2:1
Fuel Induction SystemDirect Injection / Up to 2900 PSI
Weight †432 kg (952 lbs) / 443 kg (977 lbs) / 453 kg (999 lbs)
Recommended FuelOctane 89
Recommended Engine OilYamalube® 4M (See owner's manual)
Recommended Fuel FiltrationYamaha 10-Micron Fuel / Water Separating Filter (external)
C.A.R.B. Rating3-Star
ExhaustThrough Propeller (Except in Reverse Under 2500 RPM)
IgnitionTCI Microcomputer
Spark PlugILMAR7E-9 / Iridium
Alternator OutputUp to 96 amps net/ 100 amps gross, max
Starting SystemElectric w/ PTT
LubricationWet Sump
Engine Oil Capacity7.8L / 8.2 Quarts | 7.5L / 7.9 Quarts
Recommended CoolingThermostatic Control
Ethanol Blend Limit10% Maximum
Gear Ratio(25/14) 1.79
Gear ShiftForward, Neutral, Reverse
Shaft Length25" - 30" - 35"
Degree of Tilt-4° through +73°
Degree of Trim-4° through +16°
Dry Weight25" shaft / 432 kg (952 lbs) ; 30" shaft / 443 kg (977 lbs; 35" shaft / 453 kg (999 lbs)
Mounting Centers28.5"
SteeringIntegrated, Electric Actuation
Steering Angle (maximum)31° from center, either direction
WarrantyLimited 5-Year Pleasure, 3-Year Government, 1-Year Commercial

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