Yamaha Portable F4 Four Stroke

Print Full Specs

Engine Type One-Cylinder
Displacement (139cc) | 8.5 ci
Bore x Stroke 62 x 46mm (2.44 x 1.81 in)
Compression Ratio 8.9:1
Prop Shaft Horsepower 4hp at 4500 rpm
Full Throttle RPM Range 4000 ~ 5000 rpm
Fuel Induction OHV
Intake Carburetor
Exhaust Above Propeller
Cooling Water/Thermostatic Control
Ignition CDI
Spark Plug CR6HSB-000-000
Alternator Output 6 Amp (Optional: Requires Charging Kit)
Starting System Manual
Lubrication Wet Sump
Engine Oil Capacity .6L (.63 qt)
Recommended Engine Oil Yamalube® 4M (See owner's manual)
Recommended Fuel Filtration Yamaha mini-10 Fuel/Water Separating Filter (external)
Recommended Fuel Regular Unleaded (Minimum Pump Octane 87)
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 69°
Degree of Trim 5 positions
C.A.R.B. Rating 3-Star
Dry Weight F4SMHA = 27kg (60 lbs), F4LMHA = 28kg (62 lbs)
Steering Angle (maximum) 90° from center, either direction
Warranty 3-year Pleasure, 3-year Government, 1-year Commercial