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High Performance DOHC 12-Valve Engine

The DF40A and DF50A are powered by Suzuki's proven in-line three-cylinder 12-valve engine. This high performance engine has a displacement of 941cm3 and features a DOHC powerhead—the only DOHC engine used in the 40-50HP outboard class—with four valves per cylinder, and an air intake system optimised for maximum efficiency in the high rpm range. When designing this engine, Suzuki engineers also focused on improving mechanical efficiency. Each component was analysed and redesigned to reduce mechanical loss in order to improve efficiency. As an example, a new oil pump design makes internal oil flow more efficient, keeping moving parts better lubricated while using less energy. The combined reduction in mechanical loss throughout the engine contributes to better fuel economy.

Suzuki Lean Burn Control System
This intelligent fuel management system predicts fuel needs by monitoring engine performance and operating conditions to deliver a leaner fuel mixture to the engine. The result is remarkable improvements in fuel economy.

Multi-Point Sequential Electronic Fuel Injection
Suzuki pioneered the use of multi-point sequential electronic fuel injection in four-stroke outboards. This advanced, time-tested system gathers operating data from a series of sensors located in key areas on the engine, processes the data and calculates the optimum amount of fuel and air needed for the engine—all in real time. Boaters benefit with smooth starts, maximum operating efficiency, excellent fuel economy, and reduced emissions.
Self-Adjusting Timing Chain
The timing chain runs in an oil-bath, so it never needs lubricating, and is equipped with an automatic hydraulic tensioner, so it remains properly adjusted at all times. Simple, effective and maintenance-free.

Recommended Transom Height (mm) S: 381, L: 508. X: 635*3
Weight (kg*) S: 102, L: 104, X: 107*3
Engine type DOHC 12-Valve
Piston Displacement (cm³) 941
Maximum Output (kw) 36.8
Steering Remote (Mechanical)
Recommended Fuel RON91 / AKI87
Alternator 12V 19A
Gear Ratio 2.27 : 1
Exhaust Through Prop Hub Exhaust
Starting system Electric
Cylinders In-line 3
Fuel Delivery System Electronic Fuel Injection
Bore X Stroke (mm) 72.5 x 76
Full Throttle Operating Range (rpm) 5,300 - 6,300
Oil Pan Capacity (L) 2.7
Fuel Tank Capacity (L) Separate(optional)25
Trim Method Power Trim and Tilt
Gear Shift F-N-R
Propeller Selection (Pitch) 9” - 17”