Yamaha Midrange F40 Four Stroke

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This versatile four stroke blends power and fuel efficiency with quiet performance and quick starts. It’s great for skiffs, jons, inflatables and small pontoons.


Engine TypeIn-Line Three Cylinder
Displacement(747cc) | 45.68 ci
Bore x Stroke65 x 75mm (2.56 x 2.95 in)
Prop Shaft Horsepower40 hp @ 5500 rpm
Compression Ratio9.4:1
Fuel InductionElectronic Fuel Injection
ExhaustThrough Propeller
IntakeSingle Throttle Valve
IgnitionCDI Microcomputer
Spark PlugDPR6EB-9
Alternator Output17 Amp
Starting SystemElectric w/PTT or Nitro Assist
LubricationWet Sump
Engine Oil Capacity1.7L/ 1.5L without filter
Full Throttle RPM Range5000 ~ 6000 rpm
CoolingWater/Thermostatic Control
Recommended Engine OilYamalube® 4M (See owner's manual)
Recommended FuelRegular Unleaded (Minimum Pump Octane 87)
Recommended Fuel FiltrationYamaha Mini 10-Micron Fuel/Water Separating Filter (external)
Ethanol Blend Limit10% Maximum
Gear Ratio(26:13) 2.00:1
Gear ShiftForward, Neutral, Reverse
Shaft LengthL = 20"
Degree of TiltPTT Models: 66° Nitro-Assist: 65°
Degree of Trim-3° through +20° on "PTT" models. 5 postions on Nitro-Assist
C.A.R.B. Rating3-Star
Dry WeightF40LA = 97kg (214 lbs) F40LEHA 101kg (223 lbs)
Steering Angle (maximum)40° from center, either direction
Warranty3-Year Pleasure, 3-Year Government, 1-Year Commercial