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Kawasaki FH531V Engine

General Technical Data

Kawasaki FH531V Engine Specifications

Engine Model ..................... Kawasaki FH531V
Engine Type ..................... Forced air cooled 4-stroke, vertical shaft, OHV gasoline
Number of Cylinders ..................... 2
Cylinder Liners ..................... Cast iron
Displacement, L (cu in) ..................... 0.494 (30.1)
Engine Bore, mm (in) ..................... 68.0 (2.69)
Engine Stroke, mm (in) ..................... 68.0 (2.69)
Maximum Horse Power, hp (kW) ..................... 18.0 (13.4)
Rated Engine Speed, rpm ..................... 3600
Maximum Torque, Nm (ft-lbs) ..................... 39 (28.8)
Torque Speed, rpm ..................... 2400
Fast Idle Speed, rpm ..................... 3550
Slow Idle Speed, rpm ..................... 1550
Compression Ratio ..................... 8.5:1
Lubrication System ..................... Full pressure
Oil Filter ..................... Spin-on type
Ignition System ..................... Flywheel magneto transistor type
Spark Plug ..................... Champion RCJ8Y
Starting System ..................... Bendix type electric starter
Charging Coil ..................... 12V-13A with Regulator

Fuel System

Fuel System ..................... Carburetor
Carburetor ..................... Float type with fixed main jet
Fuel Pump ..................... Pulse type
Fuel ..................... Unleaded gasoline (octane number 86 or higher)
Governor ..................... Mechanical
Air Cleaner ..................... Dual element

Dimensions

Length, mm (in) ..................... 425 (16.7)
Width, mm (in) ..................... 359 (14.1)
Height, mm (in) ..................... 441 (17.4)
Net weight, kg (lbs) ..................... 32.0 (71.0)

Kawasaki FH531V Maintenance Data

Cylinder Block and Valves

Cylinder Bore (Maximum), mm (in) ..................... 68.1 (2.6917)
Cylinder Compression (Minimum), kPa ..................... 386
Intake Valve Clearance (Cold), mm (in) ..................... 0.10-0.15 (0.0040-0.0059)
Exhaust Valve Clearance (Cold), mm (in) ..................... 0.10-0.15 (0.0040-0.0059)

Engine Oil and Filter

Engine Oil Type ..................... SAE 10W-30/10W-40, SAE 5W-20
Oil Classification ..................... SF, SG, SH, SJ or SL
Oil Capacity (w/o Filter), L (qts) ..................... 1.5 (1.6)
Oil Capacity (with New Filter), L (qts) ..................... 1.7 (1.8)
Oil Filter Part Number ..................... 49065-7010
Air Filter Part Number ..................... 11013-7002

Carburetor Specifications

Carburetor Model ..................... Nikki 621266
Throttle Bore Diameter, mm (in) ..................... 26.0 (1.02)
Venturi Diameter, mm (in) ..................... 21.0 (0.83)
Main Jet ..................... #116
Pilot Jet ..................... #43.8
Main Air Jet ..................... 1.4
Pilot Air Jet ..................... 0.8
Pilot Air Screw Turns Out ..................... 1-3/8
Float Level ..................... Float parallel to carburetor body
Low Idle Speed, rpm ..................... 1550 ± 100
High Idle Speed, rpm ..................... 3600 ± 100

Ignition System

Plug Type ..................... Champion RCJ8Y or NGK BPMR6A
Plug Gap, mm (in) ..................... 0.75 (0.0296)
Ignition Coil Air Gap, mm (in) ..................... 0.20-0.40 (0.0079-0.0158)

Service Intervals

Change Engine Oil ..................... Every 100 Hours
Change Oil Filter ..................... Every 200 Hours
Clean and Re-gap Spark Plug ..................... Every 100 Hours
Replace Spark Plug ..................... Every 300 Hours
Clean Air Cleaner Paper Element ..................... Every 50 Hours
Replace Air Cleaner Paper Element ..................... Every 200 Hours
Check Carburetor Adjustment ..................... Every 100 Hours
Check and Adjust Valve Clearance ..................... Every 300 Hours

Kawasaki FH531V Service Specifications

Cylinder Head and Valves

Cylinder head warp ..................... 0.05 mm (0.002 in.)
Valve clearance (Intake, Exhaust) ..................... 0.10-0.15 (0.0040-0.0059)
Valve seating surface angle (Intake, Exhaust) ..................... 45 deg
Valve seating surface width (Intake, Exhaust) ..................... 0.6-0.9 mm (0.024-0.035 in.)
Valve guide inside diameter (Intake, Exhaust) ..................... 6.00-6.012 mm (0.2362-0.2367 in.)
Valve head thickness (Intake, Exhaust) ..................... 0.35 mm (0.014 in.)
Valve stem runout (Intake, Exhaust) ..................... 0.05 mm (0.002 in.)
Valve stem diameter (Intake) ..................... 5.95 mm (0.0234 in.)
Valve stem diameter (Exhaust) ..................... 5.93 mm (0.0233 in.)
Valve guide inside diameter (Intake, Exhaust) ..................... 6.08 mm (0.239 in.)
Valve spring free length (Intake, Exhaust) ..................... 31.0 mm (1.22 in.)
Rocker arm push rod run out (Intake, Exhaust) ..................... 0.5 mm (0.02 in.)

Cylinder and Piston

Cylinder compression ..................... 390 kPa (57 psi)
Cylinder inside diameter (Standard) ..................... 68.10 mm (2.681 in.)
Cylinder inside diameter (0.50 mm Oversize) ..................... 68.60 mm (2.701 in.)
Cylinder bore diameter (Standard) ..................... 68.00-67.98 mm (2.677-2.676 in.)
Cylinder bore diameter (0.50 mm Oversize) ..................... 68.50-68.48 mm (2.697-2.696 in.)
Cylinder bore out round ..................... 0.056 mm (0.0022 in.)
Piston diameter ..................... 67.79 mm (2.669 in.)
Piston top ring/groove clearance ..................... 0.15 mm (0.006 in.)
Piston second ring/groove clearance ..................... 0.12 mm (0.005 in.)
Piston ring thickness ..................... 1.40 mm (0.055 in.)
Piston top ring end gap ..................... 0.70 mm (0.028 in.)
Piston second ring end gap ..................... 0.78 mm (0.031 in.)
Piston oil ring end gap ..................... 1.05 mm (0.041 in.)
Piston pin outside diameter ..................... 15.96 mm (0.628 in.)
Piston pin hole inside diameter ..................... 16.08 mm (0.633 in.)
Connecting rod small end inside diameter ..................... 16.05 mm (0.632 in.)
Cam lobe height ..................... 29.131 mm (1.1469 in.)
Camshaft journal diameter ..................... 15.985 mm (0.6293 in.)
Camshaft bearing inside diameter ..................... 16.136 mm (0.6352 in.)

Crankshaft and Connecting Rod

Connecting rod bend ..................... 0.15/100 mm (0.006/3.94 in.)
Connecting rod twist ..................... 0.15/100 mm (0.006/3.94 in.)
Connecting rod big end width ..................... 18.80 mm (0.74 in.)
Crankpin width ..................... 39.50 mm (1.56 in.)
Connecting rod big end inside diameter ..................... 35.055 mm (1.3801 in.)
Crankpin outside diameter ..................... 34.94 mm (1.3756 in.)
Crankshaft run out ..................... 0.05 mm (0.002 in.)
Crankshaft journal diameter (PTO side) ..................... 34.90 mm (1.374 in.)
Crankshaft journal diameter (Flywheel side) ..................... 34.93 mm (1.375 in.)
Crankshaft journal bearing inside diameter ..................... 35.15 mm (1.384 in.)

Lubricating System

Oil pressure ..................... 241-310 kPa (35-45 psi)
Oil pressure switch ..................... 98 kPa (14.2 psi)
Oil filter by-pass valve openning pressure ..................... 78.5-117.5 kPa (11.4-17.1 psi)
Oil pump inner and outer rotor clearance ..................... 0.2 mm (0.008 in.)
Oil pump outer rotor outside diameter ..................... 40.470 mm (1.5933 in.)
Oil pump housing inside diameter ..................... 40.801 mm (1.6063 in.)
Oil pump housing depth ..................... 10.230 mm (0.4028 in.)
Oil pump shaft outside diameter ..................... 10.923 mm (0.4300 in.)
Oil pump shaft bearing inside diameter ..................... 11.072 mm (0.4359 in.)
Relief valve spring free length ..................... 19.50 mm (0.77 in.)

Kawasaki FH531V Tightening Torque Specs

Cylinder Head Bolts ..................... 25 Nm (19 ft-lb)
Valve Clearance Lock Screws ..................... 6.9 Nm (61 in-lb)
Connecting Rod Big End ..................... 5.9 Nm (52 in-lb)
Rocker Arm Bolts ..................... 28 Nm (20 ft-lb)
Rocker Cover Mounting Bolts ..................... 5.9 Nm (52 in-lb)
Exhaust Pipe Flange Nuts ..................... 15 Nm (11 ft-lb)
Spark Plugs ..................... 22 Nm (16 ft-lb)
Drain Screw (Carburetor) ..................... 1.3 Nm (11 in-lb)
Governor Arm Clamp Nut ..................... 7.8 Nm (69 in-lb)
Intake Manifold Mounting Bolts ..................... 5.9 Nm (52 in-lb)
Cleaner Body Mounting Screws ..................... 3.4 Nm (30 in-lb)
Plug Bolt (Engine-shroud) ..................... 5.9 Nm (52 in-lb)
Plug Screw (Engine-shroud) ..................... 3.4 Nm (30 in-lb)
Choke Valve Screw ..................... 0.7 Nm (6 in-lb)
Throttle Valve Screws ..................... 1.0 Nm (9 in-lb)