Tohatsu MFS50 EFI vs Mercury 45hp (Inline-4)
MFS50 EFI
45hp (Inline-4)
| Spec | Tohatsu MFS50 EFI | Mercury 45hp (Inline-4) |
|---|---|---|
| Power & Performance | ||
| Horsepower | 50 HP | 45 HP |
| Displacement | 866 cc ← | 720 cc |
| Configuration | 3 Cyl / Inline | 4 Cyl / Inline |
| Weights & Dimensions | ||
| Dry Weight | 95 kg (209 lbs) | 72 kg (159 lbs) ← |
| Mechanical & Electrical | ||
| Gear Ratio | 2.08:1 | 2.0 |
| Alternator | 252 W ← | 113 W |
| Fuel Delivery | EFI | Carbureted |
| Maintenance | ||
| Spark Plug | NGK IKR6G8 | NGK BUHW (Surface Gap) |
| Engine Oil | Tohatsu 4-Stroke Oil | TC-W3 2-Stroke |
Technical Comparison Analysis
Power & Displacement
Comparing the Tohatsu MFS50 EFI and Mercury 45hp (Inline-4) shows a displacement difference of 146cc. The Tohatsu features a larger 866cc 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 72kg, offering a weight saving of 23kg 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 Tohatsu offers the best charging performance with a 252W 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.