DF50A / DF40A

High Performance DOHC 12-Valve Engine

Suzuki engineers based the DF50A and DF40A engine on 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 36.8kW (50PS)/29.4kW (40PS) outboard class—with four valves per cylinder, and an air intake system optimized for maximum efficiency in the high rpm range.

When designing this engine, Suzuki engineers also focused on improving mechanical efficiency. Each component was analyzed and redesigned to reduce mechanical loss in order to improve efficiency.

Suzuki's Lean Burn Control System

Suzuki's Lean Burn Control System is an intelligent system that monitors engine performance and operating conditions to predict fuel needs and deliver a leaner fuel mixture to the engine. First introduced on the DF90A/80A/70A, and later on the DF60A, this system provides remarkable improvements in fuel economy from low speed operation up into the cruising range, which is where the engine is used a majority of the time. In-house testing shows that at medium speeds, the DF50A achieves a 23% improvement in fuel consumption than its predecessor.

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.

Specifications

MODEL	DF50A
RECOMMENDED TRANSOM HEIGHT mm	S:381, L:508
STARTING SYSTEM	Electric
WEIGHT kg *4	S:102, L:104
ENGINE TYPE	DOHC 12-Valve
FUEL DELIVERY SYSTEM	Multi-Point Sequential Electronic Fuel Injection
NO. OF CYLINDERS	3
PISTON DISPLACEMENT cm3	941
BORE ×STROKE mm	72.5 × 76
MAXIMUM OUTPUT kW	36.8
FULL THROTTLE OPERATING RANGE rpm	5,300 - 6,300
STEERING	Remote
OIL PAN CAPACITY Lit.	2.7
FUEL TANK CAPACITY Lit.	25 (Optional)
IGNITION SYSTEM	Fully-transistorized
ALTERNATOR	12V 19A
ENGINE MOUNTING	Shear Mount
TRIM METHOD	Power Trim and Tilt
GEAR RATIO	2.27:1
GEAR SHIFT	F-N-R
EXHAUST	Through Prop Hub Exhaust
PROPELLER SELECTION (Pitch)*5 All propellers are the 3-blade type	9"-17"