Kawasaki FD671D Engine

General Technical Data

Kawasaki FD671D Engine Specifications

Engine Model .............. Kawasaki FD671D
Engine Type .............. 4-cycle horizontal shaft overhead valve liquid-cooled gasoline engine
Number of Cylinders .............. 2
Cylinder Layout .............. 90 deg, V-Twin
Cylinder Liners .............. Cast iron
Displacement, cc (cu.in) .............. 745 (45.5)
Engine Bore, mm (in) .............. 78.0 (3.07)
Engine Stroke, mm (in) .............. 78.0 (3.07)
Maximum Horse Power, hp (kW) .............. 20.5 (15.3)
Rated Engine Speed, rpm .............. 3600
Maximum Torque, Nm (ft-lb) .............. 50.1 (39.6)
Torque Speed, rpm .............. 2400
Compression Ratio .............. 8.0:1
Lubrication System .............. Pressurised feed by positive displacement pump
Oil Filter Type .............. Cartridge, full flow
Air Cleaner Type .............. Dual stage element
Cooling System .............. Pressurized forced circulation type
Coolant Capacity, L (qts) .............. 2.7 (2.9)
Ignition System .............. Transistorized-flywheel magneto
Starting System .............. Shift type electric starter
Electrical System Rating, Volts .............. 12

Fuel System

Fuel System .............. Carburetor
Carburetor Type .............. Float with fixed main jet
Fuel Pump Type .............. Electo magnetic
Governor Type .............. Mechanical
Fuel Filter Type .............. Replaceable paper element
Fuel Type .............. Gasoline (86 or higher)

Dimensions and Weight

Overall Length, mm (in) .............. 580 (22.8)
Overall Width, mm (in) .............. 458 (17.9)
Overall Height, mm (in) .............. 520 (20.5)
Net Weight, kg (lbs) .............. 58.0 (128.0)

Kawasaki FD671D Maintenance Data

Cylinder Block and Valves

Cylinder Inside Diameter (Max), mm (in) .............. 78.080 (3.0740)
Cylinder Compression, kPa (psi) .............. 700 (102)
Cylinder Head Warp, mm (in) .............. 0.06 (0.002)
Intake Valve Clearance (Cold), mm (in) .............. 0.15 (0.006)
Exhaust Valve Clearance (Cold), mm (in) .............. 0.15 (0.006)

Engine Oil and Filters

Engine Oil Type .............. SAE 10W-30, 10W-40, 5W-20
API Service Classifications .............. SC, SD, SE, SF, SG, or SH
Oil Capacity (w/o Filter), L (qts) .............. 1.8 (1.9)
Oil Capacity (with New Filter), L (qts) .............. 2.0 (2.1)
Oil Filter Part Number .............. 49065-2071
Air Filter Element Part Number .............. 11013-2213
Air Filter Pre-Cleaner Part Number .............. 11013-0798

Ignition System

Spark Plug Type .............. NGK BPR2ES
Spark Gap, mm (in) .............. 0.75 (0.0296)
Coil Air Gap, mm (in) .............. 0.25-0.40 (0.0099-0.0158)
Spark Plug Torque, Nm (ft-lb) .............. 25 (18.6)

Carburetor Adjustment

Caburetor Model .............. Mikuni BW26
Throttle Bore Diameter, mm (in) .............. 26.0 (1.02)
Venturi Diameter, mm (in) .............. 20.0 (0.79)
Main Jet (L) .............. #105
Main Jet (R) .............. #102.5
Pilot Jet .............. #41.3
Main Air Jet .............. 1.5
Pilot Air Jet .............. 0.8
Pilot Screw Setting (L) .............. 2-1/4 turns out
Pilot Screw Setting (R) .............. 2 turns out
Low Idle Speed, rpm .............. 1450±100
High Idle Speed, rpm .............. 3500±100

Service Intervals

Check Engine Oil Level .............. Every 10 hours
Service Air Filter Pre-Cleaner .............. Every 25 hours
Clean Fuel Filter .............. Every 50 hours
Change Engine Oil .............. Every 100 hours
Clean and Adjust Spark Plug .............. Every 100 hours
Service Air Filter Element .............. Every 100 hours
Replace Engine Oil Filter .............. Every 200 hours
Check Radiator and Hoses .............. Every 200 hours
Check Carburetor Adjustment .............. Every 200 hours
Check and Adjust Idle Speed .............. Every 200 hours
Check and Adjust Valve Clearance .............. Every 300 hours
Clean Combustion Chamber .............. Every 300 hours
Replace Spark Plug .............. Every 300 hours
Replace Air Filter Element .............. Every 300 hours
Clean Fuel Hose .............. Every 300 hours
Change Engine Coolant .............. Every 400 hours

Kawasaki FD671D Service Specifications

Cylinder Block

Cylinder Inside Diameter (Max), mm (in) .............. 78.080 (3.0740)
Cylinder Inside Diameter (0.50 Oversize), mm (in) .............. 78.580 (3.0937)
Cylinder Bore Diameter (0.50 Oversize), mm (in) .............. 78.500-78.480 (3.0905-3.0898)
Cylinder Bore Out Round, mm (in) .............. 0.056 (0.0022)
Cylinder Bore Diameter (Std), mm (in) .............. 78.000-77.980 (3.0709-3.0701)
Crankpin Outside Diameter, mm (in) .............. 39.950 (1.5728)
Crankshaft Runout, mm (in) .............. 0.05 (0.002)
Crankshaft Journal Diameter (PTO), mm (in) .............. 41.935 (1.6510)
Crankshaft Journal Diameter (Flywheel), mm (in) .............. 41.935 (1.6510)
Connecting Rod Small End Inside Diameter, mm (in) .............. 19.060 (0.7504)
Connecting Rod Big End Width, mm (in) .............. 22.35 (0.88)
Connecting Rod Big End Inside Diameter, mm (in) .............. 40.055 (1.5770)
Connecting Rod Bend, mm (in) .............. 0.15/100 (0.006/3.94)
Camshaft Journal Diameter (PTO), mm (in) .............. 19.927 (0.7845)
Camshaft Journal Diameter (Flywheel), mm (in) .............. 19.927 (0.7845)

Cylinder Head and Valves

Cylinder Head Warp, mm (in) .............. 0.06 (0.002)
Valve Clearance, mm (in) .............. 0.15 (0.006)
Valve Seating Surface Angle, Degrees .............. 45
Valve Seating Surface Width (Intake), mm (in) .............. 0.5-1.1 (0.02-0.043)
Valve Seating Surface Width (Exhaust), mm (in) .............. 0.5-1.1 (0.02-0.043)
Valves Guide Inside Diameter, mm (in) .............. 7.000-7.015 (0.2756-0.2762)
Valve Head Thickness, mm (in) .............. 0.6 (0.024)
Valve Stem Bend, mm (in) .............. 0.05 (0.002)
Valve Stem Diameter, mm (in) .............. 6.935 (0.2730)
Valve Guide Inside Diameter, mm (in) .............. 7.080 (0.2787)
Valve Spring Free Length, mm (in) .............. 31.00 (1.22)
Rocker Arm Push Rod Runout, mm (in) .............. 0.50 (0.02)
Rocker Arm Collar Outside Diameter, mm (in) .............. 10.914 Mm (0.4297)
Rocker Arm Bearing Inside Diameter, mm (in) .............. 11.052 Mm (0.4351)
Cam Lobe Height (Intake), mm (in) .............. 33.594 (1.3226)
Cam Lobe Height (Exhaust), mm (in) .............. 33.594 (1.3226)

Piston and Piston Rings

Piston Pin Outside Diameter, mm (in) .............. 18.960 (0.7465)
Piston Pin Hole Inside Diameter, mm (in) .............. 19.080 (0.7512)
Piston Outside Diameter, mm (in) .............. 77.700 (3.0590)
Top Ring Groove Clearance, mm (in) .............. 0.15 (0.0059)
Second Ring Groove Clearance, mm (in) .............. 0.15 (0.0059)
Top Ring Thickness, mm (in) .............. 1.40 (0.055)
Second Ring Thickness, mm (in) .............. 1.40 (0.055)
Top Ring End Gap, mm (in) .............. 1.0 (0.04)
Second Ring End Gap, mm (in) .............. 1.0 (0.04)
Oil Ring End Gap, mm (in) .............. 1.2 (0.05)

Tightening Torque Specs

Cylinder Head, Nm (ft-lb) .............. 27 (20)
Connecting Rod, Nm (ft-lb) .............. 21 (15.5)
Flywheel, Nm (ft-lb) .............. 56 (41.1)
Crankcase Cover, Nm (ft-lb) .............. 22 (16.2)
Intake Manifold, Nm (ft-lb) .............. 12 (9.1)
Oil Drain Plug, Nm (ft-lb) .............. 25 (18.5)
Spark Plug, Nm (ft-lb) .............. 25 (18.6)
Governor Arm, Nm (ft-lb) .............. 8 (5.8)
Carburetor, Nm (ft-lb) .............. 12 (8.5)
Water Pump, Nm (ft-lb) .............. 20 (15.1)
Rocker Arm Bracket, Nm (ft-lb) .............. 22 (16.2)
Fuel Shut-Off Solenoid Valve, Nm (ft-lb) .............. 7 (5.2)
Valve Clearance Lock Nut, Nm (ft-lb) .............. 11 (8.1)