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Kawasaki FH451V Engine

General Technical Data

Kawasaki FH451V Engine Specifications

Engine Model .............. Kawasaki FH451V
Engine Type .............. 4-cycle vertical shaft OHV air cooled gasoline engine
Number of Cylinder .............. 2
Cylinder Layout .............. 90 deg, V-Twin
Displacement, cc (cu.in) .............. 494 (30.1)
Cylinder Bore, mm (in) .............. 68.0 (2.68)
Piston Stroke, mm (in) .............. 68.0 (2.68)
Engine Power, Hp (kW) .............. 15.0 (11.2)
Maximum Torque, Nm (ft-lb) .............. 34.6 (25.5)
Torque Speed, rpm .............. 2400
Compression Ratio .............. 8.5:1
Compression Release .............. Automatic
Direction of Rotation .............. Counterclockwise (PTO Shaft)
Lubricating System Type .............. Pressure feed by positive displacement pump
Oil Filter Type .............. Cartridge type full flow filter
Air Cleaner Type .............. Dual stage element, dry type
Cooling System .............. Forced air cooled
Ignition System .............. Flywheel magneto transistor type
Choke Control .............. Automatic with throttle control
Starting System .............. Bendix type electric starter
Electrical System Rating, Volts .............. 12

Fuel System

Fuel System .............. Carburetor
Carburetor Type .............. Float with fixed main jet
Fuel Pump Type .............. Diaphragm type pulse pump
Governor Type .............. Flyweight all speed governor
Fuel Type .............. Gasoline (86 or higher)

Dimensions and Weight

Overall Length, mm (in) .............. 425 (16.7)
Overall Width, mm (in) .............. 359 (14.1)
Overall Height, mm (in) .............. 361 (14.2)
Dry weight, kg (lbs) .............. 33.0 (72)

Kawasaki FH451V Maintenance Data

Cylinder Block and Valves

Cylinder Inside Diameter (Max), mm (in) .............. 68.10 (2.681)
Cylinder Compression, kPa (psi) .............. 390 (57)
Cylinder Head Warp, mm (in) .............. 0.05 (0.002)
Intake Valve Clearance, mm (in) .............. 0.10-0.15 (0.004-0.006)
Exhaust Valve Clearance, mm (in) .............. 0.10-0.15 (0.004-0.006)

Engine Oil and Filters

Engine Oil Type .............. SAE 10W-30, 10W-40, 5W-20
API Service Classifications .............. 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 Element Part Number .............. 11013-7002
Air Filter Pre-Cleaner Part Number .............. 11013-7001

Ignition System

Spark Plug Type .............. Champion RCJ8Y
Charging Coil .............. 12V, 13 amps with regulator
Spark Spark Plug Gap, mm (in) .............. 0.75 (0.029)
Spark Plug Torque, Nm .............. 22 (16.2)

Carburetor Adjustments

Model .............. Mikuni B24T1
Throttle Bore Diameter .............. 24 mm
Venturi Diameter .............. 16 mm (0.63 in.)
Main Jet .............. #125
Pilot Jet .............. #48.8
Main Air Jet .............. 1.7 mm
Pilot Air Jet .............. 1.2 mm
Pilot Screw Setting .............. 2-1/4 turn out
High Idle Speed, rpm .............. 3600
Low Idle Speed, rpm .............. 1550

Service Intervals

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

Kawasaki FH451V Service Specifications

Cylinder Block

Cylinder Inside Diameter (Max), mm (in) .............. 68.10 (2.681)
Cylinder Bore Diameter (Std), mm (in) .............. 68.00-67.98 (2.677-2.676)
Cylinder Bore Diameter (0.50 Oversize), mm (in) .............. 68.50-68.48 (2.697-2.696)
Cylinder Bore Out Round, mm (in) .............. 0.056 (0.0022)
Crankpin Width, mm (in) .............. 39.50 (1.56)
Crankpin Outside Diameter, mm (in) .............. 34.94 (1.3756)
Crankshaft Run Out, mm (in) .............. 0.05 (0.002)
Crankshaft Journal Diameter (PTO), mm (in) .............. 34.90 (1.374)
Crankshaft Journal Diameter (Flywheel), mm (in) .............. 34.93 (1.375)
Crankshaft Journal Bearing Inside Diameter, mm (in) .............. 35.15 (1.384)
Connecting Rod Bend, mm (in) .............. 0.15/100 (0.006/3.94)
Connecting Rod Big End Width, mm (in) .............. 18.80 (0.74)
Connecting Rod Big End Inside Diameter, mm (in) .............. 35.055 (1.3801)
Connecting Rod Small End Inside Diameter, mm (in) .............. 16.05 (0.632)
Camshaft Journal Diameter, mm (in) .............. 15.985 (0.6293)
Camshaft Bearing Inside Diameter, mm (in) .............. 16.136 (0.6352)

Cylinder Head and Valves

Cylinder Head Warp, mm (in) .............. 0.05 (0.002)
Valve Clearance, mm (in) .............. 0.10-0.15 (0.004-0.006)
Valve Seating Surface Angle, deg .............. 45
Valve Seating Surface Width, mm (in) .............. 0.6-0.9 (0.024-0.035)
Valve Guide Inside Diameter, mm (in) .............. 6.00-6.012 (0.2362-0.2367)
Valve Head Thickness, mm (in) .............. 0.35 (0.014)
Valve Stem Runout, mm (in) .............. 0.05 (0.002)
Valve Stem Diameter (Intake), mm (in) .............. 5.95 (0.0234)
Valve Stem Diameter (Exhaust), mm (in) .............. 5.93 (0.0233)
Valve Guide Inside Diameter, mm (in) .............. 6.08 (0.239)
Valve Spring Free Length, mm (in) .............. 31.0 (1.22)
Rocker Arm Push Rod Run Out, mm (in) .............. 0.5 (0.02)
Cam Lobe Height, mm (in) .............. 29.131 (1.1469)

Piston and Piston Rings

Piston Diameter, mm (in) .............. 67.79 (2.669)
Piston Pin Outside Diameter, mm (in) .............. 15.96 (0.628)
Piston Pin Hole Inside Diameter, mm (in) .............. 16.08 (0.633)
Top Ring Groove Clearance, mm (in) .............. 0.15 (0.006)
Second Ring Groove Clearance, mm (in) .............. 0.12 (0.005)
Piston Ring Width, mm (in) .............. 1.40 (0.055)
Top Ring End Gap, mm (in) .............. 0.70 (0.028)
Second Ring End Gap, mm (in) .............. 0.78 (0.031)
Oil Ring End Gap, mm (in) .............. 1.05 (0.041)

Tightening Torque Specs

Cylinder Head Bolts .............. 25 Nm (19 ft-lb)
Valve Clearance Lock Screws .............. 6.9 Nm (5.1 ft-lb)
Connecting Rod Big End Bolts .............. 5.9 Nm (4.3 ft-lb)
Rocker Arm Bolts .............. 28 Nm (20.5 ft-lb)
Rocker Cover Mounting Bolts .............. 5.9 Nm (4.3 ft-lb)
Exhaust Pipe Flange Nuts .............. 15 Nm (11 ft-lb)
Spark Plugs .............. 22 Nm (16 ft-lb)
Drain Screw (Carburetor) .............. 1.3 Nm (0.95 ft-lb)
Governor Arm Clamp Nut .............. 7.8 Nm (5.7 ft-lb)
Intake Manifold Mounting Bolts .............. 5.9 Nm (4.3 ft-lb)
Cleaner Body Mounting Screws .............. 3.4 Nm (2.5 ft-lb)
Plug Bolt (Engine-Shroud) .............. 5.9 Nm (4.3 ft-lb)
Plug Screw (Engine-Shroud) .............. 3.4 Nm (2.5 ft-lb)