Yamaha F20 Portable vs Mercury 18hp (2-Stroke)
F20 Portable
18hp (2-Stroke)
| Spec | Yamaha F20 Portable | Mercury 18hp (2-Stroke) |
|---|---|---|
| Power & Performance | ||
| Horsepower | 20 HP | 18 HP |
| Displacement | 432 cc ← | 300 cc |
| Configuration | 2 Cyl / Inline | 2 Cyl / Inline |
| Weights & Dimensions | ||
| Dry Weight | 56 kg (123 lbs) | 39 kg (86 lbs) ← |
| Mechanical & Electrical | ||
| Gear Ratio | 2.08:1 | 2.0 |
| Alternator | 192 W ← | 60 W |
| Fuel Delivery | EFI | Carbureted |
| Maintenance | ||
| Spark Plug | NGK DPR6EA-9 | NGK B7HS |
| Engine Oil | 10W-30 FC-W | TC-W3 2-Stroke |
Technical Comparison Analysis
Power & Displacement
Comparing the Yamaha F20 Portable and Mercury 18hp (2-Stroke) shows a displacement difference of 132cc. The Yamaha features a larger 432cc block, which typically provides superior low-end torque and better hole-shot performance when pushing heavy loads or reaching planning speeds.
Weight & Rigging
In terms of transom weight, the Mercury is the lighter option at 39kg, offering a weight saving of 17kg over its competitor. This weight reduction is critical for smaller hulls or boats with limited transom capacity where every kilogram affects the center of gravity and drainage efficiency.
Electrical & Features
For boats equipped with modern electronics, sonar, and shallow-water anchors, the Yamaha offers the best charging performance with a 192W alternator. Choosing the right power-to-weight profile between these two 4-stroke engines depends heavily on your specific boat's displacement and daily power requirements.