Mercury 25hp SeaPro (2-Stroke) vs Mariner 25hp International (Yamaha-built 695)
25hp SeaPro (2-Stroke)
25hp International (Yamaha-built 695)
| Spec | Mercury 25hp SeaPro (2-Stroke) | Mariner 25hp International (Yamaha-built 695) |
|---|---|---|
| Power & Performance | ||
| Horsepower | 25 HP | 25 HP |
| Displacement | 429 cc | 430 cc ← |
| Configuration | 2 Cyl / Inline | 2 Cyl / Inline |
| Weights & Dimensions | ||
| Dry Weight | 48 kg (106 lbs) ← | 51 kg (112 lbs) |
| Mechanical & Electrical | ||
| Gear Ratio | 1.92:1 | 1.85 |
| Alternator | 76 W | 84 W ← |
| Fuel Delivery | Carbureted | Carbureted |
| Maintenance | ||
| Spark Plug | NGK BP8H-N-10 | NGK B8HS-10 |
| Engine Oil | TC-W3 (50:1) | TC-W3 2-Stroke |
Technical Comparison Analysis
Power & Displacement
Comparing the Mercury 25hp SeaPro (2-Stroke) and Mariner 25hp International (Yamaha-built 695) shows a displacement difference of 1cc. The Mariner features a larger 430cc 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 48kg, offering a weight saving of 3kg 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 Mariner offers the best charging performance with a 84W alternator. Choosing the right power-to-weight profile between these two 2-stroke engines depends heavily on your specific boat's displacement and daily power requirements.