Yamaha Portable F4 Four Stroke

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Engine TypeOne-Cylinder  
Displacement(139cc) | 8.5 ci  
Bore x Stroke62 x 46mm (2.44 x 1.81 in)  
Compression Ratio8.9:1  
Prop Shaft Horsepower4hp at 4500 rpm  
Full Throttle RPM Range4000 ~ 5000 rpm  
Fuel InductionOHV  
ExhaustAbove Propeller  
CoolingWater/Thermostatic Control  
Spark PlugCR6HSB-000-000  
Alternator Output6 Amp (Optional: Requires Charging Kit)  
Starting SystemManual  
LubricationWet Sump  
Engine Oil Capacity.6L (.63 qt)  
Recommended Engine OilYamalube® 4M (See owner's manual)  
Recommended Fuel FiltrationYamaha mini-10 Fuel/Water Separating Filter (external)  
Recommended FuelRegular Unleaded (Minimum Pump Octane 87)  
Ethanol Blend Limit10% Maximum  
Gear Ratio(27:13) 2.08:1  
Gear ShiftForward, Neutral, Reverse  
Shaft LengthS=15" L=20"  
Degree of Tilt69°  
Degree of Trim5 positions  
C.A.R.B. Rating3-Star  
Dry WeightF4SMHA = 27kg (60 lbs), F4LMHA = 28kg (62 lbs)  
Steering Angle (maximum)90° from center, either direction  
Warranty3-year Pleasure, 3-year Government, 1-year Commercial