Suzuki DF40A Outboard Motor — EEAT Content Strategy (USA

The 2018 Suzuki DF40A is the only engine in the 40 HP class to feature DOHC performance and a maintenance-free, oil-bathed timing chain, delivering durability and power that sets it apart from competitors. This 3-cylinder, 941cc four-stroke outboard produces 40 HP at 5000–6000 RPM, making it ideal for console boats, fishing vessels, sport boats, and RIBs across California and the United States.

Whether you’re repowering a Yamaha outboard motor setup or upgrading from a smaller Suzuki outboard motor, the DF40A offers a compelling combination of fuel efficiency, reliable starting, and compact design.

The DF40A incorporates technology that’s genuinely unique in its class. Suzuki’s Lean Burn Control System continuously adjusts the air-fuel mixture based on real-time operating conditions, improving fuel economy compared to conventional systems. The engine’s self-adjusting timing chain runs in an oil bath with an automatic hydraulic tensioner, eliminating periodic maintenance and reducing long-term ownership costs.

The Suzuki Troll Mode System allows precise RPM adjustment in 50 RPM increments from idle up to 1200 RPM, giving you exact control over trolling speed for fishing applications. This level of low-speed precision is rare in the 40 HP category.

The DF40A and DF50A received the NMMA Innovation Award at the 2011 Miami Boat Show from the Boating Writers of America — recognition of the engineering excellence built into every unit.

The 40 HP outboard segment is competitive, with strong offerings from Mercury 40 FourStroke, Yamaha F40, and Honda BF40. Here’s how the DF40A compares on the specifications that matter:

While the Mercury and Yamaha options are marginally lighter, the Suzuki DF40A’s larger displacement (941cc vs. 747cc) provides stronger low-end torque and better performance on heavier boats. The DOHC architecture and maintenance-free timing chain represent genuine long-term reliability advantages — belt-driven systems require periodic replacement, while Suzuki’s chain is designed to last the life of the engine.

The DF40A is well-suited to a wide range of American boating applications:

• Console boats — 4.5–5.5m vessels requiring reliable mid-range power

• Fishing boats — Troll Mode’s precise RPM control makes slow-trolling effortless

• RIBs and inflatables — the engine’s compact design and 229 lb weight work well with aluminum-hulled RIBs

• Sport boats — quick hole-shot and 40 HP output for watersports on smaller craft

The engine is available with remote mechanical controls or with Suzuki’s ATHL tiller handle featuring an integrated power trim switch and Troll Mode control — an excellent option for fishing-focused setups.

All motors ship from our San Francisco, CA warehouse with fast nationwide shipping. California residents pay applicable sales tax; out-of-state buyers receive straightforward delivery to their doorstep.

• 2018 Suzuki DF40A outboard motor (20″ shaft)

• Remote control box and cables

• Power Trim & Tilt system

• 3.1 gal fuel tank

• Fuel line

• Aluminum propeller

• Tool kit

• Owner’s manual

• Suzuki 3-Year Warranty

Complete your installation with these compatible components and services:

• NGK DCPR6E spark plugs — OEM-recommended plugs for reliable ignition

• Zinc anode kit for Suzuki DF40A — protect against saltwater corrosion

• Suzuki outboard motor flusher — essential for post-saltwater flushing

• Boatworld foldable outboard engine trolley — safe storage and transport

• Outboard motor service kit — impeller, spark plugs, and fuel filters

• Suzuki DF40A trim motor replacement — compatible replacement unit

• Boatworld heavy duty outboard lock — security for your investment

• Marine battery and charging systems — matched to 12V 19A alternator output (650 MCA / 512 CCA minimum recommended)

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SKU: SUZ-DF40A-2018-20
MPN: DF40A
Brand: Suzuki Marine
Category: Outboard Motors > Mid-Range (40–60 HP)