Yamaha Midrange F25 Four Stroke
Print Full SpecsThis 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 Type | In-Line 2 Cylinder |
Displacement | (498 cc) | 30.4 ci |
Bore x Stroke | 65mm x 75mm | 2.56 x 2.95in |
Prop Shaft Horsepower | 25 hp @ 5500 rpm |
Compression Ratio | 9.4:1 |
Fuel Induction | SOHC |
Exhaust | Through Propeller |
Intake | Carburetor |
Ignition | CDI Micro Computer |
Spark Plug | DPR6EB-9 |
Alternator Output | 13AMP with Rectifier Regulator |
Starting System | M = Manual | E = Electric |
Lubrication | Wet Sump |
Engine Oil Capacity | 1.6L/1.4L without filter |
Full Throttle RPM Range | 5000 ~ 6000 rpm |
Cooling | Water/Thermostatic Control |
Recommended Engine Oil | Yamalube® 4M (See owner's manual) |
Recommended Fuel | Regular Unleaded (Minimum Pump Octane 87) |
Recommended Fuel Filtration | Yamaha Mini 10-Micron Fuel/Water Separating Filter (external) |
Ethanol Blend Limit | 10% Maximum |
Gear Ratio | (27:13) 2.08:1 |
Gear Shift | Forward, Neutral, Reverse |
Shaft Length | S: 15", L: 20" |
Degree of Tilt | Manual: Up to 73° w/ 2-position Shallow Water Drive. PTT or Nitro Assist: Up to 73° |
Degree of Trim | Manual : 5 Tilt Pin Positions Nitro Assist: 5 Tilt Pin Positions PTT: -3° through +16° |
C.A.R.B. Rating | 3-Star |
Dry Weight | F25SMHA = 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 |
Warranty | 3-Year Pleasure, 3-Year Government, 1-Year Commercial |