Suzuki DF100A Specifications
| Engine Model: Suzuki DF100A |
| Engine Type: 4-stroke inline 4-cylinder DOHC 16-valve gasoline outboard engine |
| Total Displacement: 124.7 cu.in (2 L) |
| Rated Engine Power: 100 Hp (73.6 kW) at 5500 rpm |
| Fuel System: Multi point sequential electronic fuel injection |
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The Suzuki DF100A is a technologically advanced
four-stroke outboard that maximizes fuel economy through its
sophisticated Lean Burn Control System, which optimizes the air-fuel
mixture during cruising speeds.
Sharing its robust 2,044 cc powerhead with the
larger DF115A and DF140A models, it delivers strong, reliable power with
a focus on low-end torque, making it particularly adept at planing
heavier boats and pushing large loads.
Its design incorporates a maintenance-free
timing chain, an offset driveshaft for better weight distribution, and a
comprehensive anti-corrosion finish, ensuring durability and ease of
ownership in both freshwater and demanding saltwater environments.
Engine Model: Suzuki DF100A
Engine Type: 4-Stroke, DOHC (Double Overhead Camshaft), 16-Valve
Number of Cylinders: In-Line 4
Valve Train Drive: Self-adjusting oil-bathed timing chain
Bore and Stroke: 86.0 mm x 88.0 mm (3.40 in x 3.50 in)
Piston Displacement: 2044 cc (124.7 cu. in)
Maximum Output: 73.6 kW (100 Hp)
Full Throttle Operating Range: 5000-6000 rpm
Fuel Delivery System: Multi Point Sequential Electronic Fuel Injection
Alternator: 12V 40A
Trim Method: Power Trim and Tilt
Gear Ratio: 2.59:1
Gear Shift: F-N-R (Forward-Neutral-Reverse)
Control System: Remote steering; tiller kit optional
Exhaust: Through Prop Hub Exhaust
Propeller Selection: 15" - 25" pitch
Starting System: Electric
Ignition System: Fully-transistorized
Engine Lubrication: Wet sump
Engine Oil Capacity: 5.5 L (5.8 US qt)
CARB Emissions Rating: 3-Star Ultra-Low
The DF100A is built around a robust in-line four-cylinder block with a
displacement of 2044 cc, a powerplant it shares with the DF115A and
DF140A models. This larger displacement foundation contributes to its
strong torque output, especially at lower engine speeds. The powerhead
features a 16-valve, dual overhead cam (DOHC) design that ensures
efficient combustion and high-performance operation. A key feature is
the self-adjusting, oil-bathed timing chain, which is equipped with an
automatic hydraulic tensioner.
This system eliminates the need for routine maintenance and ensures
precise, reliable valve timing over the engine's entire lifespan. The
engine also utilizes an innovative offset driveshaft design, which
positions the powerhead forward of the driveshaft. This shifts the
outboard's center of gravity forward, resulting in better weight
distribution on the boat's transom and improved handling for vessels
sensitive to stern weight.
The hallmark of the DF100A's fuel system is the Suzuki Lean Burn Control
System. This technology uses an O2 sensor feedback system to constantly
monitor engine operating conditions, allowing the engine to run on a
leaner, more efficient fuel mixture during cruising speeds, which can be
from around 1500 to 5000 rpm.
This optimization provides significant improvements in fuel efficiency.
This system works in concert with the Multi-Point Sequential Electronic
Fuel Injection, which delivers a precise and optimized air-fuel mixture
to each cylinder. This combination ensures immediate throttle response,
smooth acceleration, stable idling, and reduced exhaust emissions.
The engine is also equipped with a Suzuki Water Detecting System. This
system uses a sensor in the fuel filter/water separator to alert the
operator with both a visual warning light and an audible buzzer if water
is detected in the fuel, helping to prevent poor combustion, power loss,
and internal corrosion.
The DF100A employs a dependable wet sump lubrication system. A trochoid
oil pump ensures that pressurized oil is delivered to all critical
moving parts within the engine, including the crankshaft, connecting
rods, and valve train components.
The engine has a total oil capacity of 5.5 liters. Regular oil changes,
using high-quality 4-stroke outboard oil meeting NMMA FC-W
certification, are a fundamental part of the maintenance schedule to
ensure long-term durability and performance.
Engine temperature is managed by a reliable water-cooled system. A water
pump, located in the lower unit, draws water from the surrounding
environment through an inlet on the gearcase and circulates it through
water jackets within the cylinder block and powerhead. A significant
feature for maintenance and longevity is the Fresh Water Flushing
System.
This system includes a dedicated flush port that allows owners to easily
connect a garden hose to rinse salt, sand, or other debris from the
cooling passages after use, particularly in saltwater environments,
thereby protecting the engine from corrosion and blockages.
| Mid Section and Lower Unit |
The mid-section houses the offset driveshaft, which contributes to the
engine's forward center of gravity and compact mounting footprint. The
lower unit contains a robust gearcase with a high 2.59:1 gear reduction
ratio.
This ratio enables the engine to swing larger propellers, translating
its power into strong, efficient thrust for excellent hole-shot and the
ability to push heavier loads effectively. This design makes the DF100A
well-suited for larger displacement boats and work applications. Exhaust
gases are channeled through the propeller hub, contributing to quieter
overall operation.
The Power Trim and Tilt (PTT) system provides hydraulic control over the
outboard's angle, allowing the operator to adjust the boat's trim for
optimal performance, fuel efficiency, and ride comfort while underway.
The system includes an electronic tilt limit system, which is designed
to prevent the motor from being tilted too high, protecting both the
outboard and the boat from potential contact damage in applications with
limited clearance. For operation in very shallow water, the motor can be
tilted up beyond the normal trim range, but operation should then be
restricted to slow speeds to prevent damage.
The DF100A is designed to work with a range of propellers to match
various boat types and load conditions. The recommended propeller pitch
selection ranges from 15 inches to 25 inches. Selecting the correct
propeller is essential to allow the engine to operate within its
designated full-throttle range of 5000-6000 rpm, ensuring maximum
performance, fuel efficiency, and engine longevity.
When installing a propeller, it is critical to coat the propeller shaft
splines with Suzuki water-resistant grease to prevent corrosion. The
propeller nut should be tightened to a specific torque setting and
secured with a new cotter pin.
Transom Height (Long Shaft): 508 mm (20 in)
Transom Height (Extra Long Shaft): 635 mm (25 in)
Dry Weight (Long Shaft): 182 kg (401 lbs)
Dry Weight (Extra Long Shaft): 187 kg (412 lbs)
Engine Mounting: Shear mount system
Engine Oil Capacity: 5.5 L (5.8 US qt) with filter.
Recommended Oil: High-quality 4-stroke outboard oil, NMMA FC-W
certified; viscosity grade based on operating temperature.
Spark Plug: Refer to owner's manual for specific model (e.g., NGK
DCPR7E).
Spark Plug Gap: Standard: 0.8-0.9 mm (0.031-0.035 in).
Gearcase Oil Capacity: Information available in service manual.
Water Pump Impeller: Inspection and potential replacement generally
recommended annually or every 100 hours.
Connecting Rod Nuts: 16-18 Nm (12-13 lb-ft).
Flywheel Nut: 130-140 Nm (96-103 lb-ft).
Spark Plugs: 20-25 Nm (15-18 lb-ft).
Propeller Nut: 50-60 Nm (36.0-43.5 lb-ft).
Oil Drain Plug (Engine): 23-27 Nm (17-20 lb-ft).
Gearcase Oil Drain/Fill Screws: 7-10 Nm (5-7 lb-ft).
Power Trim and Tilt Motor Assembly Bolts: 23-27 Nm (17-20 lb-ft).
The Suzuki DF100A is an exceptionally versatile outboard, suitable for a
wide range of boat types. Its design emphasis on low-end torque and the
ability to swing a large propeller makes it particularly well-suited for
heavier boats and applications where pushing power is valued.
Fishing Boats: An ideal primary power source for bay boats, center
consoles, and tiller-steer models in the 17 to 20-foot range, offering
the reliability and low-end grunt needed for fishing. Pontoon Boats: A
popular choice for powering pontoon boats, where its strong torque
provides excellent acceleration for getting on plane and efficient
cruising for leisurely days on the water.
Dual Console and Bowrider Boats: Provides quiet, clean, and efficient
power for family runabouts used for cruising, tubing, and water skiing.
Lightweight Cruisers and Deck Boats: Suitable for smaller cabin cruisers
and deck boats where a balance of power, weight, and fuel economy is
essential for enjoyable trips. Commercial and Work Applications: Its
robust construction, fuel efficiency, and corrosion resistance also make
it a dependable choice for various light-duty commercial applications.
Saltwater Use: Extensively protected by Suzuki's multi-layer
Anti-Corrosion Finish, which includes epoxy resin and multiple paint
layers, it is engineered to withstand the corrosive effects of the
saltwater environment, ensuring long-term durability and a high-quality
appearance. An optional Troll Mode System is also available for anglers
who require precise trolling speed control.
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