Kawasaki FD731V Specifications
| Engine Model: Kawasaki FD731V |
| Engine Type: 4-cycle V-Twin cylinder OHV vertical shaft liquid-cooled gasoline |
| Total Displacement: 41.2 cu.in (675 cc) |
| Rated Engine Power: 26 Hp (19.4 kW) at 3600 rpm |
| Carburetor Type: Float with fixed main jet |
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Engine Model ............... Kawasaki FD731V
Engine Type ............... 4-cycle V-twin vertical shaft OHV liquid-cooled gasoline engine
Number of Cylinders ............... 2
Cylinder Liners ............... Cast iron
Displacement, cc (cu.in) ............... 675 (41.2)
Engine Bore, mm (in) ............... 75.2 (2.96)
Engine Stroke, mm (in) ............... 76.0 (2.99)
Maximum Horse Power, hp (kW) ............... 26.0 (19.4)
Rated Engine Speed, rpm ............... 3600
Maximum Torque, Nm (ft-lb) ............... 57.7 (42.6)
Torque Speed, rpm ............... 2400
Fast Idle Speed, rpm ............... 3550
Slow Idle Speed, rpm ............... 1550
Compression Ratio ............... 8.5:1
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
Ignition System ............... Electronic
Starting System ............... Shift type electric starter
Electrical System Rating, Volts ............... 12
Fuel System ............... Carburetor
Carburetor Type ............... Float with fixed main jet
Fuel Pump Type ............... Diaphragm type pulse pump
Governor Type ............... Mechanical
Fuel Type ............... Gasoline (86 or higher)
Overall Length, mm (in) ............... 432 (17.0)
Overall Width, mm (in) ............... 435 (17.1)
Overall Height, mm (in) ............... 555 (21.9)
Net weight, kg (lbs) ............... 45.0 (99.0)
Cylinder Inside Diameter (Max), mm (in) ............... 75.30 (2.965)
Cylinder Bore Out Round, mm (in) ............... 0.056 (0.0022)
Cylinder Bore Diameter (Std), mm (in) ............... 75.18-75.2 (2.598-2.9606)
Crankpin Width, mm (in) ............... 45.0 (1.772)
Crankpin Outside Diameter, mm (in) ............... 39.95 (1.573)
Crankshaft Runout, mm (in) ............... 0.05 (0.002)
Crankshaft Journal Diameter (PTO Side), mm (in) ............... 39.90 (1.571)
Crankshaft Journal Diameter (Flywheel Side), mm (in) ............... 39.90 (1.571)
Connecting Rod Bend, mm (in) ............... 0.2/100 (0.008/3.94)
Connecting Rod Big End Width, mm (in) ............... 20.2 (0.795)
Connecting Rod Big End Inside Diameter, mm (in) ............... 40.05 (1.577)
Connecting Rod Small End Inside Diameter, mm (in) ............... 16.06 (0.6323)
Camshaft Journal Diameter, mm (in) ............... 15.99 (0.6295)
Camshaft Bearing Inside Diameter, mm (in) ............... 16.08 (0.6331)
Rocker Arm Push Rod Runout, mm (in) ............... 0.5 (0.02)
Rocker Arm Collar Outside Diameter, mm (in) ............... 10.914 (0.4297)
Rocker Arm Bearing Inside Diameter, mm (in) ............... 11.132 (0.4382)
Cylinder Head Warp, mm (in) ............... 0.03 (0.001)
Valve Clearance, mm (in) ............... 0.15 (0.006)
Valve Head Thickness, mm (in) ............... 0.35 (0.014)
Valve Stem Bend, mm (in) ............... 0.05 (0.002)
Valve Stem Diameter, mm (in) ............... 6.94 (0.2730)
Valve Guide Inside Diameter, mm (in) ............... 7.08 (0.279)
Valve Spring Free Length, mm (in) ............... 32.9 (1.30)
Valve Seating Surface Angle, Degrees ............... 45
Valve Seating Surface Width (Intake), mm (in) ............... 0.8-1.4 (0.031-0.055)
Valve Seating Surface Width (Exhaust), mm (in) ............... 1.1-1.6 (0.43-0.063)
Valves Guide Inside Diameter, mm (in) ............... 7.000-7.015 (0.2756-0.2762)
Cam Lobe Height, mm (in) ............... 41.45 (1.6319)
Piston Outside Diameter, mm (in) ............... 74.98 (2.952)
Piston Pin Outside Diameter, mm (in) ............... 15.96 (0.628)
Piston Pin Hole Inside Diameter, mm (in) ............... 16.09 (0.6335)
Top Ring Groove Clearance, mm (in) ............... 0.16 (0.0063)
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) ............... 0.7 (0.03)
Second Ring End Gap, mm (in) ............... 0.7 (0.03)
Oil Ring End Gap, mm (in) ............... 1.0 (0.04)
Cylinder Inside Diameter (Max), mm (in) ............... 75.30 (2.965)
Cylinder Compression, kPa (psi) ............... 682 (99)
Cylinder Head Warp, mm (in) ............... 0.03 (0.001)
Intake Valve Clearance (Cold), mm (in) ............... 0.15 (0.0059)
Exhaust Valve Clearance (Cold), mm (in) ............... 0.15 (0.0059)
Engine Oil Type ............... SAE 10W-30, 10W-40, SAE 5W-20
Oil Classification ............... SF, SG, SH or SJ
Oil Capacity (w/o Filter), L (qts) ............... 2.0 (2.2)
Oil Capacity (with New Filter), L (qts) ............... 2.3 (2.5)
Spark Plug Type ............... NGK BPR2ES
Spark Plug Gap, mm (in) ............... 0.75 (0.0296)
Coil Air Gap, mm (in) ............... 0.25-0.40 (0.0099-0.0158)
Oil Filter Part Number ............... 49065-2071
Air Filter Part Number (Standard) ............... 11013-2223, 11013-2218
Air Filter Part Number (Heavy-Duty) ............... 11013-7019, 11013-7020
Caburetor Model ............... Mikuni BW26
Throttle Bore Diameter, mm (in) ............... 26.0 (1.02)
Venturi Diameter, mm (in) ............... 21.0 (0.83)
Main Jet (R) ............... #120
Main Jet (L) ............... #115
Pilot Jet (R) ............... #50
Pilot Jet (L) ............... #46.3
Main Air Jet ............... 1.7
Pilot Air Jet ............... 1.2
Pilot Screw Setting (L) ............... 2-7/8 turns out
Pilot Screw Setting (R) ............... 3-11/16 turns out
Low Idle Speed, rpm ............... 1550±100
High Idle Speed, rpm ............... 3600±100
Check Engine Oil Level ............... Every 10 hours
Service Air Filter Pre-Cleaner (Standard) ............... Every 25 hours
Change Engine Oil ............... Every 100 hours
Clean and Adjust Spark Plug ............... Every 100 hours
Service Air Filter Element (Standard) ............... 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
Replace Primary Air Filter (Heavy-Duty) ............... Every 250 hours
Check Secondary Air Filter (Heavy-Duty) ............... Every 250 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 (Standard) ............... Every 300 hours
Change Engine Coolant ............... Every 400 hours
Replace Secondary Air Filter (Heavy-Duty) ............... Every 500 hours
Clean Fuel Line ............... Every 500 hours
Cylinder Head, Nm (ft-lb) ............... 32 (23.6)
Connecting Rod, Nm (ft-lb) ............... 9.8 (7.2)
Rocker Arm Bolts, Nm (ft-lb) ............... 22 (16.3)
Flywheel, Nm (ft-lb) ............... 56 (41.1)
Crankcase Cover, Nm (ft-lb) ............... 21 (15.5)
Intake Manifold, Nm (ft-lb) ............... 6 (4.4)
Carburetor Bolts and Nuts, Nm (ft-lb) ............... 12 (8.9)
Oil Drain Plug, Nm (ft-lb) ............... 7 (5.2)
Spark Plug, Nm (ft-lb) ............... 25 (18.6)
Valve Clearance Lock Nut, Nm (ft-lb) ............... 11 (8.1)
Water Pump Bolts (M6), Nm (ft-lb) ............... 10 (7.9)
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