Yamaha 4 HP Outboard Motors
SKU: F4SMHA
Yamaha’s smallest Portables, the F4 weigh in at as little as 59 pounds, with streamlined overhead-valve, one-cylinder designs. Their light weights, combined with built-in carrying handles, resting pads and an oil-leak prevention system for on-side storage capability create true portability. Add to that their efficiency, performance and reliability and these pint-sized powerhouses are perfect for all sorts of light duty, like hopping to the cuddy on a tender. Wherever the day takes you, you can take along a little extra power with an F2.5 Yamaha Portable.
Our 139-cc 4-hp portable outboard is the smallest motor on our roster, but it still packs a punch. Completely redesigned, it’s even more portable, easier to store and clean burning.
- Available for tiller-handle control with forward-neutral shifting, 360-degree steering and an ergonomic twist-grip throttle
- Only 59 pounds (15” shaft model)
- Available in 15” and 20” shaft lengths
| Engine Type | 1 cyl |
|---|---|
| Displacement | 139cc |
| Bore x Stroke | 62 x 46mm (2.44 x 1.81in) |
| Prop Shaft Horsepower | 4hp at 4500 rpm |
| Full Throttle RPM Range | 4000 ~ 5000 |
| Alternator Output at W.O.T. | 6 Amp |
| Compression Ratio | 8.9:1 |
| Fuel Induction System | Carb |
| Weight † | 27 kg (59 lbs) - 28 kg (61 lbs) |
| Recommended Fuel | Octane 87 |
| Recommended Engine Oil | Yamalube® 4M (See owner's manual) |
| Recommended Fuel Filtration | N/A |
| C.A.R.B. Rating | 3-Star |
| Exhaust | Above Propeller |
| Intake | 2 |
| Ignition | CDI |
| Spark Plug | CR6HSB |
| Starting System | Manual |
| Lubrication | Wet Sump |
| Engine Oil Capacity | 0.6L |
| Recommended Cooling | Thermostatic Control |
| Ethanol Blend Limit | 10% Maximum |
| Gear Ratio | 2.08:1 |
| Gear Shift | Forward, Neutral, Reverse |
| Shaft Length | 15" - 20" |
| Degree of Tilt | 69° |
| Degree of Trim | -4° through +16° |
| Mounting Centers | N/A |
| Steering | |
| Steering Angle (maximum) | 90° from center, either direction |
| Warranty | Limited 3-Year Pleasure, 3-Year Government, 1-Year Commercial |