Suzuki DF50A Specifications
| Engine Model: Suzuki DF50A |
| Engine Type: 4-stroke 3-cylinder DOHC gasoline outboard engine |
| Total Displacement: 57.4 cu.in (941 cc) |
| Rated Engine Power: 50 Hp (36.7 kW) at 6300 rpm |
| Fuel System: Multi-point sequential electronic fuel injection |
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The Suzuki DF50A is a technologically
sophisticated outboard that distinguishes itself in the 50 Hp class
through its use of a Dual Overhead Camshaft (DOHC) powerhead, a feature
uncommon in this segment. Its engineering focus is clearly on mechanical
efficiency and fuel economy, highlighted by the integration of Suzuki's
Lean Burn Control System and a maintenance-free timing chain.
Users benefit from the Easy Start System and a robust 19-amp alternator
that provides ample power for electronics even at low engine speeds. The
DF50A is engineered for durability, incorporating a multi-layer
anti-corrosion finish to withstand harsh marine environments, making it
a reliable and clean-operating powerplant for a wide range of boat
types.
Engine Model: Suzuki DF50A, DF50AT, DF50ATH
Engine Type: 4-stroke, three-cylinder, DOHC gasoline outboard engine
Number of Cylinders: 3
Displacement: 57.4 cu.in (941 cc)
Cylinder Bore: 2.85 in (72.5 mm)
Piston Stroke: 2.99 in (76.0 mm)
Maximum Engine Power: 50.0 hp (36.7 kW)
Maximum Engine Speed: 5300-6300 rpm
Idle Speed: 800±50 rpm
Compression Ratio: 9.7:1
Lubrication System: Wet sump with trochoid pump
Exhaust System: Through propeller hub
Cooling System: Water-cooled with thermostat
Ignition System: Full-transistorized
Starting System: Electric starter
Electrical System Rating: 12 Volts
Charging System: Alternator
Alternator Rating: 19 A (approx. 11.5A at 1,000 rpm)
Cylinder Bore Inside Diameter: 2.8543-2.8551 in (72.500-72.520 mm)
Cylinder Bore (Maximum Out of Round): 0.002 in (0.050 mm)
Crank Pin Outside Diameter: 1.4954-1.4961 in (37.982-38.000 mm)
Crank Pin Width: 0.7913-0.7953 in (20.100-20.200 mm)
Crankshaft Thrust Play: 0.004-0.012 in (0.11-0.31 mm)
Crankshaft Journal Outside Diameter: 1.7709-1.7717 in (44.982-45.000 mm)
Crankshaft Journal Oil Clearance: 0.0006-0.0013 in (0.014-0.034 mm)
Connecting Rod Inside Diameter (Big End): 1.6142-1.6149 in
(41.000-41.018 mm)
Connecting Rod Oil Clearance (Big End): 0.0012-0.0019 in (0.031-0.049
mm)
Connecting Rod Side Clearance (Big End): 0.0039-0.0098 in (0.100-0.250
mm)
Connecting Rod Width (Big End): 0.7854-0.7874 in (19.950-20.000 mm)
Connecting Rod Inside Diameter (Small End): 0.7088-0.7092 in
(18.003-18.013 mm)
Piston Skirt Diameter: 2.8531-2.8539 in (72.470-72.490 mm)
Piston to Cylinder Clearance: 0.0008-0.0016 in (0.020-0.040 mm)
Piston Pin Outside Diameter: 0.7085-0.7087 in (17.995-18.000 mm)
Piston Pin Bore Inside Diameter: 0.7089-0.7092 in (18.006-18.014 mm)
Piston to Piston Pin Clearance: 0.0002-0.0007 in (0.006-0.019 mm)
Top Ring Width: 0.040-0.041 in (1.02-1.04 mm)
Second Ring Width: 0.048-0.049 in (1.21-1.23 mm)
Oil Ring Width: 0.079-0.080 in (2.01-2.03 mm)
Top Ring End Gap: 0.0059-0.0118 in (0.15-0.30 mm)
Second Ring End Gap: 0.0118-0.0177 in (0.30-0.45 mm)
Top Ring Side Clearance: 0.0012-0.0028 in (0.030-0.070 mm)
Second Ring Side Clearance: 0.0008-0.0024 in (0.02-0.06 mm)
Cylinder Head Warp Limit: 0.002 in (0.050 mm)
Valve Head Diameter (Intake): 1.05 in (26.6 mm)
Valve Head Diameter (Exhaust): 0.85 in (21.5 mm)
Valve Head Thickness (Intake): 0.040 in (1.00 mm)
Valve Head Thickness (Exhaust): 0.045 in (1.15 mm)
Valve Stem Outside Diameter (Intake): 0.2152-0.2157 in (5.465-5.480 mm)
Valve Stem Outside Diameter (Exhaust): 0.2142-0.2148 in (5.440-5.455 mm)
Valve Guide Inside Diameter (Intake): 0.2165-0.2170 in (5.500-5.512 mm)
Valve Guide Inside Diameter (Exhaust): 0.2165-0.2170 in (5.500-5.512 mm)
Valve Stem to Guide Clearance (Intake): 0.0008-0.0019 in (0.020-0.047
mm)
Valve Stem to Guide Clearance (Exhaust): 0.0018-0.0028 in (0.045-0.072
mm)
Valve Seat Width (Intake): 0.043-0.051 in (1.1-1.3 mm)
Valve Seat Width (Exhaust): 0.043-0.051 in (1.1-1.3 mm)
Valve Spring Free Length: 1.30 in (33.10 mm)
Cam Height (Intake): 1.5039-1.5102 in (38.200-38.360 mm)
Cam Height (Exhaust): 1.4858-1.4921 in (37.740-37.900 mm)
Camshaft Journal Outside Diameter: 0.9029-0.9037 in (22.934-22.955 mm)
Camshaft Journal Inside Diameter: 0.9055-0.9063 in (23.000-23.021 mm)
Camshaft Journal Oil Clearance: 0.0018-0.0034 in (0.045-0.087 mm)
Fuel System Type: Multi-point sequential electronic fuel injection
Fuel Pump Type: Integral, low-pressure
Fuel Type: Unleaded gasoline, 87 octane (RON 91) minimum
Lean Burn Control: Suzuki Lean Burn Control System for optimized fuel
economy at cruising speeds
Fuel Tank Capacity: 6.6 gal (25.0 L) (optional)
System Type: Wet sump, forced lubrication by trochoid pump
Engine Oil Type: SAE 10W-30 or 10W-40, 4-stroke outboard oil
API Service Classification: SG, SH, SJ, SL, or SM
Engine Oil Capacity: 2.85 qts (2.70 L)
Oil Filter: Cartridge type, replaced at specified intervals
System Type: Thermostatically controlled, water-cooled, forced
circulation
Water Pump: Belt-driven, with rubber impeller
Thermostat: Regulates engine operating temperature
Flushing System: Fresh water flushing system incorporated for
maintenance
| Mid Section and Lower Unit |
Mid Section: Integral driveshaft housing with engine mount system
Engine Mounting: Shear mount for vibration dampening
Steering System (DF50AT): Remote control
Steering System (DF50ATH): Tiller handle
Gear Housing Type: Bevel gear reduction
Reversing System: Gear type with forward-neutral-reverse (F-N-R)
Gear Ratio: 2.28:1 (commonly cited as 2.27:1)
Reduction System: Bevel gear
Gearcase Capacity: 0.65 qts (0.61 L)
Gear Lubricant Type: Suzuki Outboard Motor Gear Oil or API GL-5 SAE 90
Trim System: Power Trim and Tilt
Trim Angle Range: 0 to 19 degrees
Maximum Tilt Angle: 72 degrees
System Type: Hydraulic, electrically actuated
0Propeller Types: 3-blade, aluminum
Propeller Diameter Range: 11.25 in (285 mm) to 11.5 in (292 mm)
Propeller Pitch Range: 9 in (228 mm) to 17 in (432 mm)
Material: High-strength aluminum alloy
Overall Length (DF50AT): 27.5 in (699.0 mm)
Overall Length (DF50ATH): 32.0 in (814.0 mm)
Overall Width: 14.8 in (377.0 mm)
Overall Height (Short Shaft model): 49.8 in (1265.0 mm)
Overall Height (Long Shaft model): 54.6 in (1385.0 mm)
Transom Height (Short Shaft): 15 in (381 mm)
Transom Height (Long Shaft): 20 in (508 mm)
Outboard Weight (DF50AT, Short Shaft): 225.0 lbs (102.0 kg)
Outboard Weight (DF50AT, Long Shaft): 229.0 lbs (104.0 kg)
Outboard Weight (DF50ATH, Long Shaft): 238.0 lbs (108.0 kg)
Engine Fuel: Unleaded gasoline, 87 octane (RON 91) minimum
Engine Oil: SAE 10W-30 or 10W-40, API SG/SH/SJ/SL/SM
Engine Oil Capacity: 2.85 qts (2.70 L)
Gear Lubricant: GL-5 SAE 90
Gearcase Capacity: 0.64 qts (0.61 L)
Ignition Timing: 2-22 degrees BTDC
Spark Plug Type: NGK DCPR6E (resistor type)
Spark Plug Gap: 0.031-0.035 in (0.8-0.9 mm)
Valve Lash (Intake): 0.007-0.009 in (0.18-0.22 mm) (cold)
Valve Lash (Exhaust): 0.011-0.013 in (0.28-0.32 mm) (cold)
Every 100 Hours: Check and/or change
engine oil, check gear oil, check spark plug, check breather and fuel
line, check low-pressure fuel filter, check anodes, check thermostat,
check propeller.
Every 200 Hours: Replace oil filter,
check and adjust valve lash, check timing belt condition, check idle
speed, inspect water pump and impeller.
Every 300 Hours: Replace spark
plugs, replace water pump impeller.
Every 400 Hours: Replace
low-pressure fuel filter.
Cylinder Head Cover Bolt: 8.2 lb-ft (11 Nm)
Cylinder Head Bolt: 42.7 lb-ft (59 Nm)
Crankcase Bolt (Inside): 33.5 lb-ft (46 Nm)
Crankcase Bolt (Outside): 18.0 lb-ft (25 Nm)
Connecting Rod Cap Bolt: 11.0 lb-ft (15 Nm)
Flywheel Nut: 120.0 lb-ft (166 Nm)
Camshaft Housing Bolt: 8.2 lb-ft (11 Nm)
Fuel Delivery Pipe Bolt: 8.2 lb-ft (11 Nm)
Low Pressure Fuel Pump Bolt: 8.0 lb-ft (11 Nm)
Intake Manifold Bolt/Nut: 16.5 lb-ft (23 Nm)
Oil Pressure Switch: 9.5 lb-ft (13 Nm)
Timing Chain Guide Bolt: 8.2 lb-ft (11 Nm)
Starter Motor Mounting Bolt: 16.5 lb-ft (23 Nm)
Oil Pump Bolt: 8.2 lb-ft (11 Nm)
Engine Oil Filter: 10.5 lb-ft (14 Nm)
Water Pump Case Nut: 5.8 lb-ft (8 Nm)
Power Unit Mounting Bolt: 36.0 lb-ft (50 Nm)
Driveshaft Housing Bolt: 36.0 lb-ft (50 Nm)
Propeller Nut: 40.0 lb-ft (55 Nm)
Gearcase Bolt: 16.5 lb-ft (23 Nm)
Tiller Handle Bolt: 27.0 lb-ft (37 Nm)
Spark Plug: 7.5-9.0 lb-ft (10-12 Nm)
The Suzuki DF50A is a versatile outboard suited for a wide range of
small to mid-sized boats. Its power and compact design make it an
excellent choice for aluminum fishing boats, jon boats, and bay boats
where shallow water maneuvering is required. It is also a popular
powerplant for pontoons and small deck boats, providing ample thrust for
family cruising and water sports.
Additionally, its weight and dimensions are well-matched for rigid
inflatable boats (RIBs) and small center console skiffs, where
efficiency and reliability are paramount. The availability of both
tiller (DF50ATH) and remote steering (DF50AT) models further broadens
its adaptability, from simple workboat applications to more
sophisticated recreational craft.
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