Kawasaki FR651V Engine

General Technical Data

Kawasaki FR651V Engine Specifications

Engine Model .............. Kawasaki FR651V
Engine Type .............. 4-cycle vertical shaft V-twin OHV air-cooled gasoline engine
Number of Cylinders .............. 2
Cylinder Liners .............. Cast iron
Displacement, cc (cu.in) .............. 726 (44.3)
Cylinder Bore, mm (in) .............. 78.0 (3.07)
Piston Stroke, mm (in) .............. 76.0 (2.99)
Rated Engine Power, hp (kW) .............. 18.8 (14.1)
Rated Engine Speed, rpm .............. 3600
Maximum Torque, Nm (ft-lb) .............. 53.2 (39.2)
Torque Speed, rpm .............. 1800
Compression Ratio .............. 8.2:1
Lubrication System .............. Pressure feed by positive displacement pump
Cooling System .............. Forced-air
Oil Filter .............. Cartridge type full flow
Air Cleaner .............. Single stage element, dry type
Ignition System .............. Transistorized-flywheel magneto
Starting System .............. Electric starter
Electrical System Rating, Volts .............. 12

Fuel System

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

Dimensions and Weight

Overall Length, mm (in) .............. 481 (18.9)
Overall Width, mm (in) .............. 424 (16.7)
Overall Height, mm (in) .............. 380 (15.0)
Net weight, kg (lbs) .............. 40.0 (88.2)

Kawasaki FR651V Maintenance Data

Cylinder Block and Valves

Cylinder Inside Diameter (Max), mm (in) .............. 78.08 (3.074)
Cylinder Compression, kPa (psi) .............. 448 (65)
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) .............. 1.8 (1.9)
Oil Capacity (with New Filter), L (qts) .............. 2.1 (2.2)
Oil Filter Part Number .............. 49065-7007
Air Filter Element Part Number .............. 11013-0752

Carburetor Adjustment

Carburetor Model .............. Walbro LMF-23
Throttle Bore Diameter, mm (in) .............. 30.0 (1.18)
Venturi Diameter, mm (in) .............. 22.0 (0.87)
Main Jet .............. #124
Pilot Jet .............. #56
Pilot Screw Setting .............. 1-1/4±1/2 turns
Low Idle Speed (Carburetor), rpm .............. 1450
Low Idle Speed (Governor), rpm .............. 1550
High Idle Speed, rpm .............. 3600

Ignition System

Spark Plug Type .............. NGK BPR4ES
Spark Plug Gap, mm (in) .............. 0.70-0.80 (0.0277-0.0316)
Coil Air Gap, mm (in) .............. 0.20-0.40 (0.0079-0.0158)
Spark Plug Torque, Nm (ft-lb) .............. 22 (16)

Service Intervals

Check Engine Oil Level .............. Every 10 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
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 FR651V Service Specifications

Cylinder Block

Cylinder Inside Diameter (Max), mm (in) .............. 78.08 (3.074)
Cylinder Bore Out Round, mm (in) .............. 0.05 (0.002)
Connecting Rod Bend, mm (in) .............. 0.15/100 (0.006/3.94)
Connecting Rod Big End Width, mm (in) .............. 22.05 (0.868)
Connecting Rod Big End Inside Diameter, mm (in) .............. 40.04 (1.58)
Connecting Rod Small End Inside Diameter, mm (in) .............. 17.06 (0.672)
Crankpin Width, mm (in) .............. 40.0 (1.57)
Crankpin Outside Diameter, mm (in) .............. 39.94 (1.57)
Crankshaft Runout, mm (in) .............. 0.05 (0.002)
Crankshaft Journal Diameter (PTO), mm (in) .............. 37.90 (1.492)
Crankshaft Journal Diameter (Flywheel), mm (in) .............. 39.88 (1.570)
Crankshaft Bearing Inside Diameter, mm (in) .............. 40.035 (1.576)

Cylinder Head and Valves

Cylinder Head Warp, mm (in) .............. 0.05 (0.002)
Valve Clearance, mm (in) .............. 0.10-0.15 (0.0040-0.0059)
Valve Seat Angle, deg .............. 45
Valve Seat Width (Intake), mm (in) .............. 1.2-1.8 mm (0.047-0.071)
Valve Seat Width (Exhaust), mm (in) .............. 0.8-1.6 (0.031-0.063)
Valve Guide Inside Diameter, mm (in) .............. 6.00-6.012 (0.2362-0.2367)
Valve Head Thickness, mm (in) .............. 0.30 (0.012)
Valve Stem Runout, mm (in) .............. 0.05 (0.002)
Valve Stem Diameter (Intake), mm (in) .............. 5.95 (0.234)
Valve Stem Diameter (Exhaust), mm (in) .............. 5.93 (0.233)
Valve Guide Inside Diameter, mm (in) .............. 6.08 (0.239)
Valve Spring Free Length, mm (in) .............. 31.0 (1.22)
Rocker Arm Push Rod Runout, mm (in) .............. 0.5 (0.02)
Cam Lobe Height, mm (in) .............. 29.36 (1.156)

Piston and Piston Rings

Piston Outside Diameter, mm (in) .............. 77.79 (3.063)
Top Ring Groove Clearance, mm (in) .............. 0.19 (0.0075)
Second Ring Groove Clearance, mm (in) .............. 0.20 (0.0079)
Piston Ring Thickness, mm (in) .............. 1.1 (0.043)
Top Ring End Gap, mm (in) .............. 0.6 (0.024)
Second Ring End Gap, mm (in) .............. 0.9 (0.035)
Oil Ring End Gap, mm (in) .............. 1.1 (0.043)
Piston Pin Outside Diameter, mm (in) .............. 16.96 (0.668)
Piston Pin Hole Inside Diameter, mm (in) .............. 17.08 (0.672)

Tightening Torque Specs

Cylinder Head Bolts, Nm (ft-lb) .............. 46 (34)
Crankcase Cover Bolts, Nm (ft-lb) .............. 27 (20)
Flywheel Bolt, Nm (ft-lb) .............. 56 (41)
Valve Clearance Lock Screws, Nm (ft-lb) .............. 11 (8.2)
Connecting Rod Big End, Nm (ft-lb) .............. 9.8 (7.3)
Rocker Arm Bolts, Nm (ft-lb) .............. 14.7 (11)
Rocker Cover Mounting Bolts, Nm (ft-lb) .............. 5.9 (4.4)
Exhaust Pipe Flange Nuts, Nm (ft-lb) .............. 15 (11)
Spark Plugs, Nm (ft-lb) .............. 22 (16)
Governor Arm Clamp Nut, Nm (ft-lb) .............. 7.8 (5.8)
Carburetor Mounting Nut, Nm (ft-lb) .............. 5.9 (4.4)
Inlet Manifold Bolts, Nm (ft-lb) .............. 5.9 (4.4)
Main Jet, Nm (ft-lb) .............. 2.3 (1.7)
Intake Manifold Mounting Bolts, Nm (ft-lb) .............. 5.9 (4.4)