Suzuki DF15A Specifications
| Engine Model: Suzuki DF15A |
| Engine Type: 4-stroke 2-cylinder OHC gasoline outboard engine |
| Total Displacement: 20.1 cu.in (327 cc) |
| Rated Engine Power: 15 Hp (11 kW) at 6000 rpm |
| Fuel System: Multi-point sequential electronic fuel injection |
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The Suzuki DF15A is a technologically advanced
portable outboard that sets new standards in its class. Its
groundbreaking Battery-Less Electronic Fuel Injection system operates
without the need for a battery, ensuring reliable starting and smooth
running performance in all conditions while minimizing weight. The
addition of Suzuki's proven Lean Burn Control technology optimizes the
air-fuel mixture across the operating range, delivering remarkable fuel
efficiency and reduced emissions at all engine speeds.
The engine is available in multiple configurations including short and
long shaft lengths, tiller or remote steering, and manual or electric
start options. Built with Suzuki's advanced anti-corrosion system for
durability in marine environments and featuring an Easy Start recoil
system with exceptionally light pull effort, the DF15A offers
user-friendly operation combined with state-of-the-art engineering.
At just 44 kg for the manual start short shaft model, it is the lightest
outboard in its class, making it an ideal power source for small fishing
boats, inflatables, and as a dependable auxiliary engine.
Engine Model - Suzuki DF15A, DF15AE, DF15AR, DF15AT, DF15ATH
Engine Type - 4-stroke two-cylinder OHC gasoline outboard engine
Number of Cylinders - 2
Displacement - 327 cc (20.1 cu-in)
Cylinder Bore - 60.4 mm (2.38 in)
Piston Stroke - 57.0 mm (2.24 in)
Maximum Engine Power - 11.0 kW (15.0 hp)
Full Throttle Operating Range - 5000 - 6000 r/min
Idle Speed - 800 - 900 r/min
Fuel System Type - Multi-Point Sequential Electronic Fuel Injection
Fuel Pump Type - Integral with high-pressure pump, fuel cooler, and
vapor separator
Fuel Type - Unleaded gasoline (91 octane minimum)
Ignition System - Digital CDI
Cooling System - Water-cooled with thermostat
Exhaust System - Through propeller hub
Starting System - Manual recoil or electric
Choke System - Automatic via EFI system
Gear Shift - Forward - Neutral - Reverse
Gear Ratio - 2.08:1
Steering System - Tiller Handle or Remote Control
Trim and Tilt System - Manual Trim and Tilt or Power Trim and Tilt
Transom Height (Short Shaft) - 381 mm (15 in)
Transom Height (Long Shaft) - 508 mm (20 in)
Dry Weight (Short Shaft, Manual) - 44.0 kg (97.0 lbs)
Dry Weight (Short Shaft, Electric) - 48.0 kg (105.7 lbs)
Dry Weight (Long Shaft, Manual) - 45.0 kg (99.0 lbs)
Dry Weight (Long Shaft, Electric) - 49.0 kg (108.0 lbs)
Alternator Rating - 12V 6A (manual start), 12V 12A (electric start)
The powerhead is constructed around an inline two-cylinder configuration
with a displacement of 327 cc. The engine is a 4-stroke cycle gasoline
unit featuring OHC valve mechanism with two intake and two exhaust
valves per cylinder. The cylinder bore inside diameter measures
60.400-60.415 mm, with a maximum permissible out-of-round of 0.050 mm.
The piston skirt diameter is 60.365-60.380 mm, resulting in a
piston-to-cylinder clearance of 0.0271-0.0425 mm. The piston pin outside
diameter is 15.995-16.000 mm, with a piston pin bore inside diameter of
16.002-16.008 mm, providing a clearance of 0.002-0.013 mm. The
connecting rod big end inside diameter is 29.025-29.034 mm, with a crank
pin outside diameter of 28.989-29.000 mm, resulting in an oil clearance
of 0.025-0.045 mm. Connecting rod side clearance at the big end is
0.100-0.250 mm. The crankshaft journal outside diameter is 31.989-32.000
mm with an oil clearance of 0.020-0.047 mm.
Maximum crankshaft runout is 0.040 mm and crankshaft thrust play is 0.6
mm. The piston rings include a top ring, second ring, and oil ring. The
top ring has a width of 1.02-1.04 mm and an end gap of 0.12-0.25 mm. The
second ring width is 1.21-1.23 mm with an end gap of 0.26-0.39 mm. Top
ring side clearance is 0.030-0.070 mm, while second ring side clearance
is 0.02-0.06 mm.
The cylinder head incorporates the OHC valve train with four valves per
cylinder, two intake and two exhaust. The OHC is mounted over the
cylinder head and driven by the crankshaft through a timing belt. This
design allows for more direct valve movement that follows crankshaft
rotation without delay, promoting efficient combustion and a compact
engine profile. The cylinder head warp limit is 0.050 mm.
Minimum valve head thickness for both intake and exhaust valves is 0.50
mm. The intake valve stem outside diameter is 5.475-5.490 mm, while the
exhaust valve stem is 5.450-5.465 mm. Valve guide inside diameter for
both valves is 5.500-5.512 mm. Intake valve stem-to-guide clearance is
0.010-0.037 mm, and exhaust clearance is 0.035-0.062 mm. Valve seat
width for both intake and exhaust is 0.9-1.1 mm.
The valve spring free length is 33.16 mm. Intake cam height is
23.710-23.870 mm, while exhaust cam height is 23.530-23.690 mm. Camshaft
journal outside diameter is 24.959-24.980 mm for the upper journal and
22.959-22.980 mm for the lower, with an oil clearance of 0.020-0.062 mm.
Valve lash is set to 0.16-0.20 mm for both intake and exhaust valves.
The DF15A features a revolutionary Multi-Point Sequential Electronic
Fuel Injection system that operates without a battery, an industry first
in this Hp class. All-new components including an inline high-pressure
fuel pump, fuel cooler, vapor separator, fuel injectors, and a new
throttle body were designed to be as compact and lightweight as
possible. The system provides quicker starts, smoother running
performance, and superior acceleration in all operating conditions.
Suzuki's Lean Burn Control technology monitors engine performance and
operating conditions to deliver the optimal air-fuel mixture, resulting
in significant fuel savings and reduced emissions throughout the
operating range. A standard 12-liter external fuel tank is included with
the engine. The engine is designed to run on unleaded gasoline with a
minimum octane rating of 91.
The lubrication system is a pressure-fed wet sump design utilizing a
trochoid-type cam-driven oil pump to ensure reliable oil delivery to all
critical engine components. This pressurised system reduces friction and
wear, enhancing engine longevity.
The engine includes a replaceable cartridge-style oil filter. Engine oil
capacity is 1.00 liter of SAE 10W-30 or 10W-40 oil, meeting API service
classifications SG through SN. A low oil pressure warning system with
LED indicator protects the engine from operation with insufficient oil
pressure.
Engine temperature is regulated by a water-cooled system. Cooling water
is drawn into the engine through intakes on the gearcase and circulated
by a rubber impeller water pump. A thermostat maintains optimal
operating temperature for combustion efficiency and performance. A heat
exchanger helps maintain constant engine temperature to prevent
overheating.
The system includes a fresh water flushing port, allowing owners to
easily flush cooling passages with fresh water after use in salt or
polluted water. An overheat warning system alerts the operator to
cooling system malfunctions. A tell-tale port provides visible
confirmation that the cooling system is operational. The water pump
impeller requires regular inspection and replacement according to the
maintenance schedule.
| Mid Section and Lower Unit |
The mid-section houses the driveshaft and provides the mounting
interface to the transom bracket. The engine mounting utilizes a shear
mount design to isolate and dampen vibration from the hull. The lower
unit contains the gearcase, which is filled with 0.25 liters of Suzuki
Outboard Motor Gear Oil or GL5 SAE 90 gear oil.
The gears provide a reduction ratio of 2.08:1, optimizing propeller
speed for effective thrust. The shift mechanism enables smooth and
positive engagement of Forward, Neutral, and Reverse gears. Exhaust
gases are expelled through the propeller hub for quieter operation.
Trim and tilt adjustments are available in both manual and power
configurations depending on model selection. Manual trim systems use a
pin in one of several adjustment positions on the transom bracket.
Power tilt models provide smooth tilting of the outboard with greater
convenience and improved easier operation. A tilt release lever on
manual models disengages the lock for tilting the engine out of the
water for beaching, trailering, or storage. The system allows for
optimal boat performance under varying load and water conditions.
The DF15A is designed to use three-bladed aluminum propellers. The
standard propeller diameter is 235 mm (9.25 in). A wide range of
propeller pitches is available from 7 inches to 11 inches to accommodate
different boat and loading conditions.
Common pitch options include 8, 9, 10, and 11 inches. The standard
propeller supplied is often a 9-1/4 x 8 or 9-1/4 x 9 pitch model
depending on application. Selecting the correct pitch is crucial for
allowing the engine to operate within its recommended full-throttle RPM
range of 5000-6000 for optimal performance and efficiency.
The short shaft model, designed for a 381 mm transom, has a dry weight
of 44.0 kg for manual start tiller models. The short shaft electric
start model weighs 48.0 kg. The long shaft manual start model, for a 508
mm transom, weighs 45.0 kg, while the electric start version weighs 49.0
kg. Models equipped with power trim and tilt have a weight of
approximately 54.5 kg.
Every 100 hours of operation or 6 months, the following tasks should be
performed: change engine oil, change gear oil, check spark plugs,
inspect breather and fuel line, check low pressure fuel filter, inspect
sacrificial anodes, verify thermostat operation, check propeller nut and
cotter pin, and check battery condition on electric start models.
Every 200 hours or 12 months, in addition to the 100-hour checks, the
engine requires replacement of the oil filter, inspection and adjustment
of valve lash, inspection of the timing belt, checking and adjusting
idle speed, and inspecting the water pump and its impeller.
Every 300 hours, the spark plugs should be replaced, and the water pump
impeller must be replaced to prevent cooling system failure. Every 400
hours or 2 years, the timing belt should be replaced and the fuel filter
should be replaced. Spark plug type is NGK BKR6E or CPR6EA-9, with a
spark plug gap of 0.7-0.8 mm.
Cylinder head bolt - 15 Nm first step, 30 Nm final step (11 lb-ft first,
21.7 lb-ft final)
Cylinder head cover bolt - 10 Nm (7.2 lb-ft)
Conrod cap bolt - 10 Nm (7.2 lb-ft)
Flywheel nut - 90 Nm (65.0 lb-ft)
Camshaft pulley bolt - 10 Nm (7.2 lb-ft)
Timing pulley nut - 50 Nm (36.0 lb-ft)
Side cover screw - 5 Nm (3.6 lb-ft)
Spark plug - 10-12 Nm (7.5-9.0 lb-ft)
Tiller handle bolt - 23 Nm (16.5 lb-ft)
Tiller handle bracket bolt - 23 Nm (16.5 lb-ft)
Steering friction adjuster nut - 9 Nm (6.5 lb-ft)
Throttle grip screw - 3 Nm (2.1 lb-ft)
Driveshaft housing bolt - 23 Nm (16.5 lb-ft)
Shallow drive arm bolt - 25 Nm (18.0 lb-ft)
Clamp bracket shaft nut - 43 Nm (31.0 lb-ft)
Propeller nut - 18 Nm (13.0 lb-ft)
Gearcase bolt - 17 Nm (12.3 lb-ft)
Water pump case nut - 6 Nm (4.3 lb-ft)
Bearing housing bolt - 8 Nm (5.8 lb-ft)
Power unit mounting bolt - 23 Nm (16.5 lb-ft)
Intake manifold - 23 Nm (16.5 lb-ft)
Throttle body - 11 Nm (8.0 lb-ft)
Low pressure fuel pump bolt - 10 Nm (7.2 lb-ft)
Fuel delivery pipe bolt - 11 Nm (8.0 lb-ft)
Starter motor mounting bolt - 23 Nm (16.5 lb-ft)
The Suzuki DF15A is engineered for a wide variety of watercraft
applications. Its compact size, light weight, and advanced features make
it an ideal primary power source for small fishing boats, aluminum
boats, jon boats, dinghies, and inflatable craft including RIBs for
coastal waters or lakes. It is particularly well-suited for entry level
boating, small tenders, and day boats for inland waterways.
The engine is also a popular and dependable choice as an auxiliary motor
for larger fishing boats or sailboats, providing reliable power and
maneuverability. With its 15 hp output and advanced EFI technology
featuring Lean Burn fuel efficiency, it is well-suited for recreational
boaters and anglers seeking an efficient, quiet, and reliable outboard
for various water conditions. The engine is saltwater rated and suitable
for use in both freshwater and saltwater environments when properly
maintained, featuring Suzuki's special anti-corrosion treatment to
protect against corrosive elements.
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