Mercury 25hp EFI (3-Cyl 500cc) vs Mariner 25hp International (Yamaha-built 695)
25hp EFI (3-Cyl 500cc)
25hp International (Yamaha-built 695)
| Spec | Mercury 25hp EFI (3-Cyl 500cc) | Mariner 25hp International (Yamaha-built 695) |
|---|---|---|
| Power & Performance | ||
| Horsepower | 25 HP | 25 HP |
| Displacement | 500 cc ← | 430 cc |
| Configuration | 3 Cyl / Inline | 2 Cyl / Inline |
| Weights & Dimensions | ||
| Dry Weight | 60 kg (132 lbs) | 51 kg (112 lbs) ← |
| Mechanical & Electrical | ||
| Gear Ratio | 2.17:1 | 1.85 |
| Alternator | 210 W ← | 84 W |
| Fuel Delivery | EFI | Carbureted |
| Maintenance | ||
| Spark Plug | NGK DCPR6E | NGK B8HS-10 |
| Engine Oil | 25W-40 FC-W | TC-W3 2-Stroke |
Technical Comparison Analysis
Power & Displacement
Comparing the Mercury 25hp EFI (3-Cyl 500cc) and Mariner 25hp International (Yamaha-built 695) shows a displacement difference of 70cc. The Mercury features a larger 500cc 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 9kg 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 Mercury offers the best charging performance with a 210W 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.