V6 4.2L 300 hp

Engine Type V6
Displacement 4.2L
Bore x Stroke 96 x 96mm (3.78 x 3.78 in)
Prop Shaft Horsepower 300hp at 5500 rpm
Full Throttle RPM Range 5000 ~ 6000 rpm
Alternator Output at W.O.T. 50 – 70 Amp
Compression Ratio 10.3:1
Fuel Induction System EFI
Weight* 250 kg (551 lbs) – 254 kg (562 lbs)
Recommended Fuel Octane 89
Recommended Engine Oil Yamalube® 4M (See owner’s manual)
Recommended Fuel Filtration Yamaha 10-Micron Fuel / Water Separating Filter (external)
C.A.R.B. Rating 3-Star
Exhaust Through Propeller
Intake 24
Ignition TCI Microcomputer
Spark Plug LFR6A-11
Alternator Output 50 – 70 Amp
Starting System Electric
Lubrication Wet Sump
Engine Oil Capacity 6.3L/6.0L
Recommended Cooling Thermostatic Control
Ethanol Blend Limit 10% Maximum
Gear Ratio 1.75:1
Gear Shift Forward, Neutral, Reverse
Shaft Length 25″ – 30″ – 35″ (F300 DEC Only)
Degree of Tilt 67°
Degree of Trim -3° through +16°
Dry Weight 25″ shaft / 255 kg (562 lbs) ; 30″ shaft / 259 kg (571 lbs)
Mounting Centers 28.5″
Steering
Steering Angle (maximum) 32° from center, either direction
Warranty Limited 3-Year Pleasure, 3-Year Government, 1-Year Commercial
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Description

The award-winning 4.2-liter F300 is the king of our V6’s. Weighing in at only 562 pounds (digital) and 551 pounds (mechanical), it’s up to 73 pounds lighter than some competitors. Plus, it’s up to 19 percent faster at cruise RPM*. It’s easy to see why it’s the top choice for offshore performance.

  • Compatible with mechanical (25” shaft) or digital controls
  • Recommended fuel: 89 Octane
  • Shaft lengths available: 25”, 30” and 35” (35” on F300 DEC only)
  • Alternator output: up to 70 amp
  • Now available in signature Yamaha gray or new pearlescent white

*Testing conducted by Yamaha at Yamaha’s test facility on a Grady-White® 257 Advance, with each boat rigged for maximum performance.

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