Yamaha F25 Portable EFI vs Mariner 25hp International (Yamaha-built 695)
F25 Portable EFI
25hp International (Yamaha-built 695)
| Spec | Yamaha F25 Portable EFI | Mariner 25hp International (Yamaha-built 695) |
|---|---|---|
| Power & Performance | ||
| Horsepower | 25 HP | 25 HP |
| Displacement | 432 cc ← | 430 cc |
| Configuration | 2 Cyl / Inline | 2 Cyl / Inline |
| Weights & Dimensions | ||
| Dry Weight | 57 kg (126 lbs) | 51 kg (112 lbs) ← |
| Mechanical & Electrical | ||
| Gear Ratio | 2.08:1 | 1.85 |
| Alternator | 192 W ← | 84 W |
| Fuel Delivery | EFI | Carbureted |
| Maintenance | ||
| Spark Plug | NGK DPR6EB-9 | NGK B8HS-10 |
| Engine Oil | Yamalube 4-Stroke | TC-W3 2-Stroke |
Technical Comparison Analysis
Power & Displacement
Comparing the Yamaha F25 Portable EFI and Mariner 25hp International (Yamaha-built 695) shows a displacement difference of 2cc. 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 Mariner is the lighter option at 51kg, offering a weight saving of 6kg 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.