Long Track Intake Manifold
Another performance enhancing feature on the DF300A is a turned long track intake manifold. Using long intake pipes tuned to provide smooth airflow into the engine the system provides the DF300A with enhanced low end power.
Large Air Intake with Water Separator
The DF300A is designed with a large air induction port to maximize airflow into the engine in order to obtain maximum power output. The increased airflow produces more low- to mid-range torque and provides a wide power band that is necessary in an outboard engine. Suzuki also designed the system with a water separator, which aids in keeping water out of the electronic throttle body and a heat shield to keep intake air from being heated by the engine.
Spherical Bore Throttle Body
An 81mm spherical bore throttle body smoothes the turbulent airflow into the engine that occurs as the throttle begins to open. Providing a smoother airflow during acceleration results in increased throttle control and stable engine operation at low rpm.
The cooler the fuel the denser it is, and the denser it is the better performance it delivers. Incorporating a fuel cooler in the DF300A’s fuel delivery system cools the fuel before it enters the engine. Providing the engine with an optimum fuel supply results in better combustion and more performance.
Strengthened Forged Pistons
The upper portion of pistons used in the big V6 engine is treated with an alumite coating that increases heat resistance. A resin coating applied to the piston skirt increases resistance to wear and reduces friction.
Suzuki outboards are among the most compact outboards in their respective classes. That’s due in part to the utilization of Suzuki’s proven offset driveshaft system. This design places the crankshaft in front of the driveshaft through the use of intermediate gear reduction. In addition to providing an increase in power performance and adding to the compactness of the outboard, this system moves the outboard’s center of gravity forward, resulting in contribution to weight distribution, balance, directional stability, and less vibration.
Two-Stage Cam Drive System
The DF300A utilizes a two-stage cam drive system that incorporates both gears and a chain. First stage gears transfer power between the crankshaft and the drive shaft from which a second stage utilizes a chain to deliver power from the driveshaft to the camshaft. This system allows for the use of smaller cam sprockets, which in turn allow for a reduction in valve angles also reducing the size of the cylinder head. An automatic hydraulic tensioner incorporated into the timing chain system keeps the chain properly tensioned and provides years of maintenance-free operation.
Suzuki Water Detecting System
Water in the fuel can be the source of poor combustion, lower power output, and corrosion. To protect the engine from moisture in the fuel, the DF300A is the first Suzuki outboard to utilize a water detecting fuel filter that alerts the operator with both visual and audio warnings when water is present in the fuel.
Water-Cooled Voltage Regulator
The outboard’s electric system includes a water-cooled voltage regulator that dissipates heat in the regulator to enhance engine durability.
Fuses protecting the DF300A’s electric system are assembled into a single fuse box located under the cowling on the side front-port of the outboard motor, which provides convenient access while offering a clean exterior.
Highly Reliable Direct Ignition System
Supplying spark to the big V6 engine is an advanced ignition system that utilizes integral type spark plug caps with built-in ignition coils. The system is controlled by the outboard’s powerful 32-bit computer and provides each cylinder with optimum spark timing. In addition to reducing the number of parts and simplifying the wiring system, this arrangement greatly reduces electronic engine “noise” that can interfere with VHF radios, fish finders, and other marine electronics.
Easier Maintenance Dual Engine Flush Ports
The buildup of sand and salt in the engine’s cooling system can lead to engine damage. To aid in reducing such buildup, the DF300A is designed with two freshwater flush ports that make flushing of the cooling system as convenient and easy as possible. With one port located on the rear panel and the second on the front panel, access is easy and flushing out the system is possible whether the boat is in or out of the water.
Convenient Dual Circuit Charging System
The DF300A incorporates a dual circuit charging system that can be adapted to accommodate the dual-battery configurations often used on large boats. When used in this configuration the system is designed to charge both the main and auxiliary batteries simultaneously but on independent circuits. With this you can drain down the accessory battery powering your electronics and still have a fully charged main battery for starting the motor.
Suzuki Trolling Mode System
Suzuki’s Trolling Mode system provides finer control over engine speed at low rpms to keep your boat moving at a constant speed while trolling. When the system is engaged, revs are controlled with an independent control switch that adjusts engine revs in 50rpm increments over a range spanning from idle to 1,200rpm. The system includes a control switch, which can be mounted nearly anywhere on the console, and a tachometer, and is compatible with Suzuki’s SMIS digital gauges or the dual scale analog gauges.
Suzuki’s Anti Corrosion Finish
The outside of the DF300A is covered with Suzuki’s anticorrosion finish that is specially formulated to increase the durability of the engine and help protect parts of the aluminum exterior that are constantly exposed to saltwater. This advanced finish offers maximum bonding to the outboard’s aluminum surface, creating an effective treatment against corrosion.