________________________________________________________________________________________
| Home / Outboard Engines / Suzuki Engines / Suzuki DF2.5 |
Suzuki DF2.5 Specifications
The Suzuki DF2.5 is a four-stroke single-cylinder overhead valve gasoline outboard engine. This engine has a carburetor fuel system, wet sump lubrication, water cooled with thermostat, and transistorized ignition system. A 4.1 cu.in (68 cc) outboard motor has a cylinder bore of 1.89" (48 mm), piston stroke of 1.50" (38 mm), and maximum power of 2.5 hp (1.8 kW) at 5250-5750 rpm. The boat motor is equipped with a manual starting system, 3-blades aluminum standard propeller, manual trim and tilt, and tiller handle steering system. The fuel tank has a capacity of 0.25 gal (0.9 liters).
____________________________________________________________________________________
| General Technical Data |
Engine Model ................ Suzuki DF2.5
Engine Type ................ 4-stroke single-cylinder OHV gasoline outboard engine
Number of Cylinders ................ 1
Displacement, cu.in (cc) ................ 4.1 (68)
Cylinder Bore, in (mm) ................ 1.89 (48.0)
Piston Stroke, in (mm) ................ 1.50 (38.0)
Maximum Engine Power, hp (kW) ................ 2.5 (1.8)
Maximum Engine Speed, rpm ................ 5250-5750
Idle Speed, rpm ................ 1900±100
Compression Ratio ................ 9.0:1
Lubrication System ................ Wet sump by trochoid pump
Exhaust System ................ Through prop
Cooling System ................ Water-cooled
Ignition System ................ Transistorized
Starting System ................ Recoil starter
Choke System ................ Manual
Throttle Control ................ Twist grip
Electrical System Rating, Volts ................ 12
| Dimensions and Weight |
Overall Length, in (mm) ................ 17.2 (437.0)
Overall Width, in (mm) ................ 10.3 (262.0)
Overall Height, in (mm) ................ 37.9 (963.0)
Transom Height (Short Shaft), in (mm) ................ 15 (381)
Outboard Weight, lbs (kg) ................ 28.7 (13.0)
| Fuel System |
Fuel System Type ................ Carburetor
Carburetor Model ................ Walbro LMJ-26
Fuel Type ................ Unleaded gasoline (91 octane minimum)
Fuel Tank Capacity, qts (L) ................ 0.94 (0.9)
| Gear Housing |
Gear Shift ................ Forward-Neutral
Reduction System ................ Bevel gear
Gear Ratio ................ 2.15:1
Gear Oil Capacity, qts (L) ................ 0.073 (0.070)
| Mid Section |
Trim System ................ Manual Trim and Tilt
Number of Tilt Pin Position ................ 4
Transom Height (Short Shaft), in (mm) ................ 15 (381)
Steering System ................ Tiller
Trim Angle, deg ................ 6-20
Tilt Angle (Max), deg ................ 74
| Propeller Information |
Diameter, in (mm) ................ 7.4 (188)
Pitch, in (mm) ................ 4.5 (115) / 5.4 (135)
Number Of Blade ................ 3
Material ................ Aluminum
| Cylinder Block |
Cylinder Bore Inside Diameter, in (mm) ................ 1.8898-1.8904 (48.000-48.015)
Cylinder Bore (Max Out of Round), in (mm) ................ 0.002 (0.050)
Crank Pin Outside Diameter, in (mm) ................ 0.7476-0.7480 (18.990-19.000)
Crank Pin Width, in (mm) ................ 0.709-0.717 (18.00-18.20)
Crankshart Runout (Maximum), in (mm) ................ 0.002 (0.050)
Connecting Rod Inside Diameter (Big End), in (mm) ................ 0.7486-0.7490 (19.015-19.025)
Connecting Rod Oil Clearance (Big End), in (mm) ................ 0.0006-0.0014 (0.015-0.035)
Connecting Rod Side Clearance (Big End), in (mm) ................ 0.008-0.028 (0.20-0.70)
Connecting Rod Width (Big End), in (mm) ................ 0.689-0.701 (17.50-17.80)
Connecting Rod Inside Diameter (Small End), in (mm) ................ 0.4727-0.4730 (12.006-12.014)
Piston Skirt Diameter, in (mm) ................ 1.8888-1.8894 (47.975-47.990)
Piston to Cylinder Clearance, in (mm) ................ 0.0007-0.0013 (0.018-0.033)
Piston Pin Outside Diameter, in (mm) ................ 0.4722-0.4724 (11.995-12.000)
Piston Pin Bore Inside Diameter, in (mm) ................ 0.4725-0.4728 (12.002-12.008)
Piston to Piston Pin Clearance, in (mm) ................ 0.0001-0.0005 (0.002-0.013)
Top Ring Width, in (mm) ................ 0.048-0.049 (1.21-1.23)
Second Ring Width, in (mm) ................ 0.048-0.049 (1.21-1.23)
Oil Ring Width, in (mm) ................ 0.059-0.060 (1.51-1.53)
Top Ring End Gap, in (mm) ................ 0.006-0.014 (0.15-0.35)
Second Ring End Gap, in (mm) ................ 0.006-0.014 (0.15-0.35)
Top Ring Side Clearance, in (mm) ................ 0.0008-0.0024 (0.02-0.06)
Second Ring Side Clearance, in (mm) ................ 0.0008-0.0024 (0.02-0.06)
| Cylinder Head and Valves |
Cylinder Head Warp Limit ................ 0.002 (0.050)
Valve Head Diameter (Intake), in (mm) ................ 0.79 (20.0)
Valve Head Diameter (Exhaust), in (mm) ................ 0.71 (18.0)
Valve Head Thickness (Intake), in (mm) ................ 0.02 (0.50)
Valve Head Thickness (Exhaust), in (mm) ................ 0.02 (0.50)
Valve Stem Outside Diameter (Intake), in (mm) ................ 0.1565-0.1571 (3.975-3.990)
Valve Stem Outside Diameter (Exhaust), in (mm) ................ 0.1559-0.1565 (3.960-3.975)
Valve Guide Inside Diameter (Intake), in (mm) ................ 0.1575-0.1580 (4.000-4.012)
Valve Guide Inside Diameter (Exhaust), in (mm) ................ 0.1575-0.1580 (4.000-4.012)
Valve Stem To Valve Guide Clearance (Intake), in (mm) ................ 0.0004-0.0015 (0.010-0.037)
Valve Stem To Valve Guide Clearance (Exhaust), in (mm) ................ 0.0010-0.0020 (0.025-0.052)
Valve Seat Width (Intake), in (mm) ................ 0.03-0.04 (0.8-1.0)
Valve Seat Width (Exhaust), in (mm) ................ 0.03-0.04 (0.8-1.0)
Valve Spring Free Length, in (mm) ................ 0.883 (22.42)
Cam Height (Intake), in (mm) ................ 1.1213-1.1291 (28.480-28.680)
Cam Height (Exhaust), in (mm) ................ 1.1213-1.1291 (28.480-28.680)
| Maintenance Data |
Engine Fuel Type ................ Unleaded 91 octane minimum
Engine Oil Type ................ SAE 10W-30, 10W-40
API Service Classifications ................ SE, SF, SG, SH, and SJ
Engine Oil Capacity, qts (L) ................ 0.40 (0.38)
Gear Lubricant Type ................ Suzuki Outboard Motor Gear Oil or GL5 SAE 90
Gearcase Capacity, qts (L) ................ 0.073 (0.070)
Ignition Timing, degrees ................ 30 BTDC
Spark Plug Type ................ NGK CR6HSA
Spark Plug Gap, in (mm) ................ 0.024-0.028 (0.6-0.7)
Valve Lash (Intake), in (mm) ................ 0.0051-0.0067 (0.13-0.17)
Valve Lash (Exhaust), in (mm) ................ 0.0051-0.0067 (0.13-0.17)
| Service Intervals |
Change Engine Oil ................ Every 100 hours
Change Gear Oil ................ Every 100 hours
Check Spark Plug ................ Every 100 hours
Check Breather and Fuel Line ................ Every 100 hours
Check Fuel Filter ................ Every 100 hours
Check Anodes ................ Every 100 hours
Check Thermostat ................ Every 100 hours
Check Carburetor ................ Every 100 hours
Check Propeller Nut and Pin ................ Every 100 hours
Check Valve Lash ................ Every 200 hours
Check Idle Speed ................ Every 200 hours
Check Water Pump ................ Every 200 hours
Check Water Pump Impeller ................ Every 200 hours
Replace Spark Plug ................ Every 300 hours
Replace Water Pump Impeller ................ Every 300 hours
| Tightening Torques |
Cylinder head cover bolt, Nm (lb-ft) ................ 7 (5.0)
Cylinder head bolt, Nm (lb-ft) ................ 13 (9.5)
Crankcase bolt, Nm (lb-ft) ................ 11 (8.0)
Conrod cap bolt, Nm (lb-ft) ................ 7 (5.0)
Valve adjusting lock nut, Nm (lb-ft) ................ 7 (5.0)
Intake pipe bolt, Nm (lb-ft) ................ 11 (8.0)
Carburetor mounting bolt, Nm (lb-ft) ................ 10 (7.0)
Flywheel nut, Nm (lb-ft) ................ 45 (32.5)
Igniter unit bolt, Nm (lb-ft) ................ 10 (7.0)
Engine oil drain plug, Nm (lb-ft) ................ 10 (7.0)
Power unit mounting bolt, Nm (lb-ft) ................ 10 (7.0)
Tiller handle pivot bolt, Nm (lb-ft) ................ 17 (12.5)
Lower cover bolt, Nm (lb-ft) ................ 8 (6.0)
Swivel shaft nut, Nm (lb-ft) ................ 10 (7.0)
Gearcase bolt, Nm (lb-ft) ................ 8 (6.0)
Water pump case bolt, Nm (lb-ft) ................ 5 (3.5)
Propeller shaft bearing housing bolt, Nm (lb-ft) ................ 8 (6.0)
Spark plug, Nm (lb-ft) ................ 10-12 (7.5-9.0)
________________________________________________________________________________________
________________________________________________________________________________________
| Engines Technical Specifications |