XF425 4 Stroke High Power NEW FOR 2019!

CONQUER WATER

An entirely new species of extreme predator is moving quietly offshore: the all-new Yamaha 5.6-litre V8 XTO Offshore. Designed from the ground up to be smarter, more powerful and more efficient, the XTO is much more than an outboard; it’s a fully integrated power system. And it’s created an entirely new class of extreme offshore power and features a FIVE-YEAR LIMITED WARRANTY, because reliability and confidence are important when you’re taking control of the open water.

 

 

 

Description

HIGHEST COMPRESSION RATIO IN AN OUTBOARD

Get more “bang” from every spark with a 12.2:1 compression ratio: better efficiency, more power and incredible throttle response.

GREAT CHARGING POWER

The V8 XTO Offshore provides up to 90 amps of total (gross) power. And since the electric steering only requires power while moving the engine, there is more power to spare while idling or trolling – when boaters need it most!

PLASMA-FUSED SLEEVELESS CYLINDERS

This micro-textured surface is 60 percent harder than steel, yet significantly lighter and thinner, increasing displacement without increasing the size of the powerhead. Other benefits include reduced friction, faster heat transfer and improved fuel economy.

EXTREME XTO OSTM PROPELLERS

Yamaha’s new family of XTO OS Propellers are made to complement the torque potential of the Yamaha XTO, working as an integral part of a system to produce massive thrust in both forward and reverse. With new stainless steel material, they are also more resistant to corrosion and surface discolouration.

MULTI-PART COWLING SYSTEM

The cowling and engine covers on the XTO are in multiple pieces for easier access to specific parts of the powerhead and midsection. These are integrated using captive fasteners and a special one-piece seal.

IN-BANKTM EXHAUST

Yamaha’s exclusive In-Bank exhaust improves flow with intake tracks entering the cylinder head from both sides of the powerhead, allowing space for exhaust gases to have a direct route to the lower unit and out the propeller hub.

THRUST-ENHANCING EXHAUST ROUTING

Below 2500 rpm, engine exhaust is directed away from the propellers for “cleaner” water and added bite in both forward and reverse, maximizing command and control at lower speeds.

WIDER TILT RANGE

At full extension, the XTO Offshore extends 5.4 inches higher out of the water than the F350. The new outboard has been engineered to allow the entire motor and lower unit to be raised completely out of the water for added convenience.

Additional information
ENGINE

ENGINE
Engine Type
32-valve V8 Four Stroke
Displacement
5.6-litre (5559 cc) / 339.2 ci
Bore & Stroke
96 x 96 mm (3.78 x 3.78 in)
RPM Range
5000-6000 (Full throttle) 600-1000 (Variable Trolling)
Compression Ratio
12.2:1
Induction System
DOHC, 4 Valves per Cylinder
Alternator Output
90 Amps Gross, Max
Fuel Delivery
Direct Injection
Starting
Electric w/ PTT
Ignition
TCI Microcomputer
Lubrication
Wet Sump
Exhaust
Through Propeller (Except in Reverse Under 2500 RPM)
Cooling
Thermostatic Control, Water
Gear Shift
F-N-R
Gear Ratio
1.79:1 (25/14)

FUEL & LUBRICATION

Recommended Fuel
Regular Unleaded (Minimum Pump Octane 89)
Recommended Oil
Yamalube Marine Lower Unit
Gear Lube HD
Oil Capacity
7.8L (8.2 qt) – with filter
7.5L (7.9 qt) – without filter