Yamaha 350 HP Engine

Yamaha 4.3L V6 OFFSHORE F350

The all-new 4.3L V6 Offshore F350 merges all the best tech from Yamaha's full line of outboards with some impressive tech of its own. The result is a well balanced, deep breathing V6 that delivers excellent power and the best power-to-weight in its class—the new, 4.3L V6 Offshore F350.

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.

V6 4.3L Digital: 350 HP

Weighing in at 629 pounds and delivering an impressive 11:1 compression ratio, the new 4.3L V6 Offshore F350 creates excellent power in an incredibly light design. In fact, it boasts the best power-to-weight in its class—by more than 65 pounds. Available in Yamaha gray, pearlescent white or new classic white, the 4.3L V6 F350 is the new knockout offshore.

  • Recommended fuel: 89 Octane
  • Shaft lengths available: 25”, 30” and 35”
  • Alternator output: up to 70 amp
  • Prop Shaft Horsepower:
    350 HP @ 6000RPM
  • Displacement:
  • Full Throttle RPM Range:
    5000 - 6000 rpm
  • Starting System:
  • Gear Ratio:
  • Alternator Output at WOT:
    50 -70 Amps
  • Weight:
    629 - 653 lbs
  • Shaft Lengths:
    25", 30", 35"
  • Recommended Fuel:
    Octane 89
  • Power Trim:
  • Engine Type:
  • Warranty:
    3-Year Limited
  • Fuel Induction System:

Helm Master EX 

A helpful navigation feature from Yamaha is Helm Master EX, a fully electronic steering system for digital outboards that makes getting to your destination easier; all while granting an incredible level of control on the water.

Power And Performance

Responsive Power

It’s center-mounted 81mm electronic throttle valve is eight percent larger than the F300. Flanked by identical port and starboard intake manifolds, it creates a well-balance design, smooth air flow and responsive power.

Increased Combustion

A camshaft profile with a higher valve lift allows for longer opening duration for intake and exhaust. Combined with reimagined valve lifters, it creates precise clearance for increased combustion.

Max Torque

A new clutch dog design, machined with more teeth, increases torque transfer from powerhead to propeller.

More Functionality / Security

Helm Master® EX includes Autopilot with Heading/Course Hold, 10+ automated modes for fishing and relaxing, in-mode joystick adjustability and the expanded ability to control up to five outboards. There’s even an optional theft-deterrent system, Y-COP®, which disables the ignition and fuel systems while docked.

Fast, Easy, Tilting

A Yamaha exclusive, TotalTilt® performs a quick, full trim up or down with the fast, double-tap of a button. This makes trailering quick and easy and is handy when a complete up or down tilt is needed.

Powerful, Precise Maneuvering

Thrust Enhancing Reverse Exhaust keeps exhaust bubbles away from the propeller below 2500 RPM and when in reverse. This means the prop bites only clean water, which results in outstanding reverse thrust and control—especially when backing down on fish and when maneuvering around docks.

Charging Power

Our 4.3L V6 Offshore F350’s 70-amp alternator produces more than 30 net amps per outboard at idle—nearly double that of Yamaha’s other comparable outboards.

More Power

Iridium spark plugs work together with Yamaha’s new fuel injection control mapping to produce a lengthened injector duration for more power.

Maintenance Videos