Kawasaki FS651V Engine

General Technical Data

Kawasaki FS651V Engine Specifications

Engine Model ..................... Kawasaki FS651V
Engine Type ..................... Air-cooled, 4-stroke, V-twin, Vertical shaft, OHV gasoline
Number of Cylinders ..................... 2
Cylinder Liners ..................... Cast iron
Displacement, L (cu in) ..................... 0.726 (36.8)
Engine Bore, mm (in) ..................... 78.0 (3.07)
Engine Stroke, mm (in) ..................... 76.0 (2.99)
Maximum Horse Power, hp (kW) ..................... 18.8 (14.1)
Rated Engine Speed, rpm ..................... 3600
Maximum Torque, Nm (ft-lbs) ..................... 53.2 (39.2)
Torque Speed, rpm ..................... 1800
Fast Idle Speed, rpm ..................... 3550
Slow Idle Speed, rpm ..................... 1550
Compression Ratio ..................... 8.2:1
Lubrication System ..................... Pressure feed by positive displacement pump
Oil Filter ..................... Cartridge type full flow
Ignition System ..................... Transistorized-flywheel magneto
Spark Plug ..................... NGK BPR4ES
Starting System ..................... Electric starter
Electric Starter Rating ..................... 12V-15 amps with regulator

Fuel System

Fuel System ..................... Carburetor
Carburetor ..................... Float type, fixed main jet, internally vented, single barrel
Fuel Pump ..................... Diaphragm type pulse pump
Fuel ..................... Unleaded gasoline (octane number 86 or higher)
Governor ..................... Flyweight all speed governor
Air Cleaner ..................... Dual stage element, dry type

Dimensions

Length, mm (in) ..................... 481 (18.9)
Width, mm (in) ..................... 424 (16.7)
Height, mm (in) ..................... 380 (15.0)
Net weight, kg (lbs) ..................... 41.0 (90.2)

Kawasaki FS651V Maintenance Data

Cylinder Block and Valves

Cylinder Bore (Maximum), mm (in) ..................... 78.1 (3.087)
Cylinder Compression (Minimum), kPa ..................... 440
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) ..................... 1.8 (1.9)
Oil Capacity (with New Filter), L (qts) ..................... 2.1 (2.2)
Oil Filter Part Number ..................... 49065-7007
Air Filter Part Number ..................... 11013-7046

Carburetor Specifications

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 Air Screw Turns Out ..................... 1-1/4±1/2
Float Level ..................... Float parallel to carburetor body
Low Idle Speed (Carburetor), rpm ..................... 1450
Low Idle Speed (Governor), rpm ..................... 1550
High Idle Speed, rpm ..................... 3600
Carburetor and Inlet Pipe Mounting Nut Torque, Nm (ft-lb) ..................... 5.9 (4.4)
Inlet Manifold Bolts Torque, Nm (ft-lb) ..................... 5.9 (4.4)
Main Jet Torque, Nm (ft-lb) ..................... 2.3 (1.7)
Governor Arm Clamp Nut Torque, Nm (ft-lb) ..................... 7.8 (5.8)
Governor Shaft Plate Screws Torque, Nm (ft-lb) ..................... 2.0 (1.5)

Ignition System

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

Service Intervals

Change Engine Oil ..................... Every 100 Hours
Change Oil Filter ..................... Every 100 Hours
Clean and Re-Gap Spark Plug ..................... Every 100 Hours
Replace Spark Plug ..................... Every 200 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 FS651V Service Specifications

Cylinder Head and Valves

Cylinder head warp, mm (in) ..................... 0.05 (0.002)
Valve clearance (Intake, Exhaust), mm (in) ..................... 0.10-0.15 (0.0040-0.0059)
Valve seating surface angle (Intake, Exhaust), deg ..................... 45
Valve seating surface width (Intake), mm (in) ..................... 1.2-1.8 mm (0.047-0.071 in.)
Valve seating surface width (Exhaust), mm (in) ..................... 0.8-1.6 (0.031-0.063)
Valve guide inside diameter (Intake, Exhaust), mm (in) ..................... 6.00-6.012 (0.2362-0.2367)
Valve head thickness (Intake, Exhaust), mm (in) ..................... 0.30 (0.012)
Valve stem runout (Intake, Exhaust), 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 (Intake, Exhaust), mm (in) ..................... 6.08 (0.239)
Valve spring free length (Intake, Exhaust), mm (in) ..................... 31.0 (1.22)
Rocker arm push rod run out (Intake, Exhaust), mm (in) ..................... 0.5 (0.02)

Cylinder and Pistons

Cylinder inside diameter (Standard), mm (in) ..................... 78.08 (3.074)
Cylinder bore out round, mm (in) ..................... 0.05 (0.002)
Piston diameter, mm (in) ..................... 77.79 (3.063)
Piston top ring/groove clearance, mm (in) ..................... 0.19 (0.0075)
Piston second ring/groove clearance, mm (in) ..................... 0.20 (0.0079)
Piston ring thickness, mm (in) ..................... 1.1 (0.043)
Piston top ring end gap, mm (in) ..................... 0.6 (0.024)
Piston second ring end gap, mm (in) ..................... 0.9 (0.035)
Piston 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)
Connecting rod small end inside diameter, mm (in) ..................... 17.06 (0.672)
Cam lobe height, mm (in) ..................... 29.36 (1.156)

Crankshaft and Connecting Rod

Connecting rod bend, mm (in) ..................... 0.15/100 (0.006/3.94)
Connecting rod twist, mm (in) ..................... 0.15/100 (0.006/3.94)
Connecting rod big end width, mm (in) ..................... 22.05 (0.868)
Crankpin width, mm (in) ..................... 40.0 (1.57)
Connecting rod big end inside diameter, mm (in) ..................... 40.04 (1.58)
Crankpin outside diameter, mm (in) ..................... 39.94 (1.57)
Crankshaft run out, mm (in) ..................... 0.05 (0.002)
Crankshaft journal diameter (PTO side), mm (in) ..................... 37.90 (1.492)
Crankshaft journal diameter (Flywheel side), mm (in) ..................... 39.88 (1.570)
Crankshaft journal bearing inside diameter, mm (in) ..................... 40.035 (1.576)

Kawasaki FS651V 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)
Intake Manifold Mounting Bolts, Nm (ft-lb) ..................... 5.9 (4.4)