Yamaha 40hp Precision Blend vs Johnson 40hp (2-Stroke)
40hp Precision Blend
40hp (2-Stroke)
| Spec | Yamaha 40hp Precision Blend | Johnson 40hp (2-Stroke) |
|---|---|---|
| Power & Performance | ||
| Horsepower | 40 HP | 40 HP |
| Displacement | 698 cc | 737 cc ← |
| Configuration | 3 Cyl / Inline-3 | 2 Cyl / Inline |
| Weights & Dimensions | ||
| Dry Weight | 84 kg (185 lbs) | 64 kg (141 lbs) ← |
| Mechanical & Electrical | ||
| Gear Ratio | 1.85 | 2.42 |
| Alternator | 120 W | 144 W ← |
| Fuel Delivery | Carbureted (Oil Injected) | Carbureted |
| Maintenance | ||
| Spark Plug | NGK BR8HS-10 | Champion QL77JC4 |
| Engine Oil | Yamalube 2M | TC-W3 2-Stroke |
Technical Comparison Analysis
Power & Displacement
Comparing the Yamaha 40hp Precision Blend and Johnson 40hp (2-Stroke) shows a displacement difference of 39cc. The Johnson features a larger 737cc 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 Johnson is the lighter option at 64kg, offering a weight saving of 20kg 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 Johnson offers the best charging performance with a 144W 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.