Yamaha Midrange F25 Four Stroke

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This midrange workhorse offers responsive power and solid fuel efficiency in a compact package. It features smart engineering conveniences, like the new Nitro Assist Tilt for effortless tilt on both electric and manual start tiller models, and our PrimeStart™ system, for reliable, turnkey starts in hot or cold conditions. Available with a 20-inch shaft (standard on all Yamaha midranges), or a 15-inch shaft for skinnier water, it’s great for skiffs, jons, inflatables and flats boats.

Engine TypeIn-Line 2 Cylinder
Displacement(498 cc) | 30.4 ci
Bore x Stroke65mm x 75mm | 2.56 x 2.95in
Prop Shaft Horsepower25 hp @ 5500 rpm
Compression Ratio9.4:1
Fuel InductionSOHC
ExhaustThrough Propeller
IgnitionCDI Micro Computer
Spark PlugDPR6EB-9
Alternator Output13AMP with Rectifier Regulator
Starting SystemM = Manual | E = Electric
LubricationWet Sump
Engine Oil Capacity1.6L/1.4L 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(27:13) 2.08:1
Gear ShiftForward, Neutral, Reverse
Shaft LengthS: 15", L: 20"
Degree of TiltManual: Up to 73° w/ 2-position Shallow Water Drive. PTT or Nitro Assist: Up to 73°
Degree of TrimManual : 5 Tilt Pin Positions Nitro Assist: 5 Tilt Pin Positions PTT: -3° through +16°
C.A.R.B. Rating3-Star
Dry WeightF25SMHA = 76kg (168lbs) F25SEHA = 79kg (174 lbs) F25SEA = 77 kg (170 lbs) F25LEA = 78kg (172 lbs) F25LA = 81kg (179 lbs) F25LMHB = 79kg (175 lbs) F25LEHB = 82kg (181 lbs)
Steering Angle (maximum)42° from center, either direction
Warranty3-Year Pleasure, 3-Year Government, 1-Year Commercial