Yamaha's 139 cc 4 HP portable outboard mirrors the OHV F6, with a couple less horses. It features the same ergonomic, easy-grip starter handle with a built-in decompression device for effortless starts. The F4 also features a built-in fuel tank with the option of switchable access to an additional external tank for amazing extended range. There's no stopping this little brute.
Features:
Tiller-handle control with forward-neutral-reverse shifting and an ergonomic twist-grip throttle
Only 59 lbs (15" shaft model, dry weight)
Solid 6A alternator
Specifications:
Engine type: 1 cylinder
Displacement: 139 cc
Bore x stroke: 62 x 46 mm (2.44 x 1.81")
Prop shaft horsepower: 4 HP at 4500 rpm
Full throttle RPM range: 4000 ~ 5000
Alternator output at wide open throttle: 6A
Compression ratio: 8.9:1
Fuel Induction system: carburetor
Weight: 27 kg (59 lbs)
Recommended fuel: octane 87
C.A.R.B. rating: 3-Star
Exhaust: above propeller
Intake: 2
Ignition: CDI
Spark plug: CR6HSB
Alternator output: 6A (charging kit required, sold seperately)
Starting system: manual
Lubrication: wet sump
Engine oil capacity: 0.6 L
Recommended cooling: thermostatic control
Ethanol blend limit: 10% maximum
Gear ratio: 2.08:1
Gear shift: forward, neutral, reverse
Degree of tilt: 69 deg.
Degree of trim: -4 deg. through +16 deg.
Dry weight: 27 kg (59 lbs)
Steering angle (maximum): 90 deg. from center, either direction
Integral fuel tank: 0.29 gal (1.1 L)
Fuel line included
Standard 3-blade aluminum propeller: 7 1/2" x 7"
External fuel tank capable (not included)
Factory Warranty: 3 years. Warranty begins on date of purchase.
