Kohler Courage SV471

General Technical Data

Kohler SV471 Engine Specifications

Engine Model ................... Kohler Courage SV471
Engine Type ................... Single-cylinder vertical shaft air-cooled gasoline
Number of Cylinders ................... 1
Displacement, cc (cu.in) ................... 597 (36.4)
Cylinder Bore, mm (in) ................... 94.0 (3.70)
Piston Stroke, mm (in) ................... 86.0 (3.38)
Rated Engine Power, hp (kW) ................... 15.0 (11.2)
Rated Engine Speed, rpm ................... 3600
Maximum Torque, Nm (ft-lbs) ................... 36.6 (27.1)
Torque Speed, rpm ................... 2800
Compression Ratio ................... 8.5:1
Lubrication System ................... Full pressure
Oil Filter Type ................... Full-flow
Air Cleaner Type ................... Replaceable, paper element
Oil Capacity, L (qts) ................... 1.5 (1.6)
Electrical System Rating, Volts ................... 12
Starter Type ................... Electric
Battery Rating ................... 12V, 400 CCA

Fuel System

Fuel System Type ................... Carburetor
Carburetor Model ................... Walbro
Carburetor Type ................... Fixed main jet
Fuel Pump Type................... Pulse
Fuel Filter Type ................... In-line
Governor Type ................... Mechanical

Dimensions and Weight

Overall Length, mm (in) ................... 493 (19.4)
Overall Width, mm (in) ................... 417 (16.4)
Overall Height, mm (in) ................... 328 (12.9)
Net Weight, kg (lbs) ................... 35.8 (79)

Kohler SV471 Maintenance Data

Engine Oil

Engine Oil Type (Summer) ................... SAE 10W-30
Engine Oil Type (Winter) ................... SAE 5W-20, 5W-30
Oil Classification (API Service) ................... SG, SH, SJ or higher
Oil Capacity (without Filter), L (qts) ................... 1.4 (1.5)
Oil Capacity (with Filter), L (qts) ................... 1.5 (1.6)

Carburetor Adjustment

Main Fuel ................... Not adjustable
Idle Fuel ................... Adjust by needle and spring with limiter cap
Low Idle Speed, rpm ................... 1500±75
High Idle Speed, rpm ................... 3600±50

Ignition System

Spark Plug Type ................... Champion RC12YC or QC12YC
Spark Plug Gap, mm (in) ................... 0.76 (0.030)
Module Air Gap, mm (in) ................... 0.203-0.305 (0.008-0.012)
Thread Size, mm (in) ................... 14 (0.55)
Reach, mm (in) ................... 19.1 (0.75)
Spark Plug Torque, Nm (ft-lb) ................... 24-30 (18-22)

Service Intervals

Service Precleaner Element ................... Every 25 hours
Replace Air Cleaner Element ................... Every 100 hours
Change Engine Oil ................... Every 100 hours
Change Oil Filter ................... Every 100 hours
Clean Cooling Areas ................... Every 100 hours
Replace Fuel Filter ................... Every 100 hours
Check Carburetor Adjustment ................... Every 200 hours
Check Spark Plug Gap ................... Every 200 hours
Replace Spark Plug ................... Every 500 hours
Check and Adjust Valve Lash ................... Every 500 hours

Kohler SV471 Service Specifications

Cylinder Block

Cylinder Bore I.D (Std) ................... 94.010-94.035 mm (3.701-3.702 in.)
Cylinder Bore I.D (Wear Limit) ................... 94.073 mm (3.704 in.)
Cylinder Bore (Max Taper) ................... 0.05 mm (0.002 in.)
Cylinder Bore (Max Out of Round) ................... 0.12 mm (0.0047 in.)
Connecting Rod to Crankpin Clearance ................... 0.03-0.055 mm (0.0012-0.0022 in.)
Connecting Rod to Crankpin Side Clearance ................... 0.25-0.59 mm (0.0098-0.0232 in.)
Connecting Rod to Piston Pin Clearance ................... 0.015-0.028 mm (0.0006-0.0011 in.)
Connecting Rod Journal O.D ................... 40.982-41.000 mm (1.6134-1.6141 in.)
Connecting Rod Journal Max Taper ................... 0.012 mm (0.0005 in.)
Connecting Rod Journal Max Out of Round ................... 0.025 mm (0.001 in.)
Crankshaft End Play (Free) ................... 0.225-1.025 mm (0.0089-0.040 in.)
Crankshaft Bore I.D (Crankcase) ................... 41.965-41.990 mm (1.6521-1.6531 in.)
Crankshaft Bore I.D (Closure Plate) ................... 44.965-44.990 mm (1.7703-1.7713 in.)
Crankshaft Bearing Journal O.D (Flywheel) ................... 44.913-44.935 mm (1.7682-1.7691 in.)
Crankshaft Bearing Journal Max Taper (Flywheel) ................... 0.0220 mm (0.0009 in.)
Crankshaft Bearing Journal Max Out of Round (Flywheel) ................... 0.025 mm (0.001 in.)
Crankshaft Bearing Journal O.D (PTO) ................... 41.913-41.935 mm (1.6501-1.6510 in.)
Crankshaft Bearing Journal MaxTaper (PTO) ................... 0.020 mm (0.0008 in.)
Crankshaft Bearing Journal Max Out of Round (PTO) ................... 0.025 mm (0.001 in.)
Crankshaft Bore Clearance (Closure Plate) ................... 0.03-0.077 mm (0.0012-0.003 in.)
Crankshaft Bore Clearance (Crankcase) ................... 0.03-0.077 mm (0.0012-0.003 in.)
Crankshaft T.I.R (PTO End, Crankshaft in Engine) ................... 0.15 mm (0.0059 in.)
Crankshaft T.I.R (Entire Crankshaft, in V-Blocks) ................... 0.10 mm (0.0039 in.)
Crankshaft Eccentrics O.D ................... 66.940-66.970 mm (2.6354-2.6366 in.)
Balance Weight Bearing Surface I.D ................... 67.011-67.086 mm (2.6382-2.6412 in.)
Guide Pin O.D ................... 11.950-11.975 mm (0.4705-0.4715 in.)
Guide Shoe Width ................... 17.85-17.90 mm (0.703-0.705)
Guide Shoe Hole I.D ................... 12.000-12.025 mm (0.4724-0.4734 in.)

Cylinder Head and Valves

Cylinder Head (Max Out of Flatness) ................... 0.8 mm (0.003 in.)
Intake Valve Lash ................... 0.127 mm (0.005 in.)
Exhaust Valve Lash ................... 0.178 mm (0.007 in.)
Intake Valve Minimum Lift ................... 8.9 mm (0.350 in.)
Exhaust Valve Minimum Lift ................... 8.9 mm (0.350 in.)
Valve Face Angle ................... 45 degrees
Valve Seat Angle ................... 89 degrees
Intake Valve Stem to Guide Clearance ................... 0.038-0.076 mm (0.0015-0.003 in.)
Exhaust Valve Stem to Guide Clearance ................... 0.050-0.88 mm (0.0020-0.0035 in.)
Intake Valve Guide I.D ................... 6.038-6.058 mm (0.2377-0.2385 in.)
Exhaust Valve Guide I.D ................... 6.038-6.058 mm (0.2377-0.2385 in.)
Intake Valve Stem Diameter ................... 5.982-6.0 mm (0.2355-0.2362 in.)
Exhaust Valve Stem Diameter ................... 5.970-5.988 mm (0.235-0.2357 in.)
Intake Valve Head Diameter ................... 37.625-37.375 mm (1.4813-1.4715 in.)
Exhaust Valve Head Diameter ................... 32.125-32.375 mm (1.2647-1.2746 in.)
Camshaft Gears End Play ................... 0.5-1.5 mm (0.019-0.059 in.)
Camshaft Gears Running Side Clearance ................... 0.02-0.13 mm (0.001-0.005 in.)
Camshaft Gear to Camshaft Running Assembly ................... 0.02-0.10 mm (0.001-0.004 in.)

Piston and Piston Rings

Piston Pin Bore I.D ................... 22.006-22.012 mm (0.8685-0.8666 in.)
Piston Pin O.D ................... 21.995-22.0 mm (0.8659-0.8661 in.)
Piston Pin End I.D ................... 22.015-22.023 mm (0.8667-0.8670 in.)
Top Compression Ring Groove Clearance ................... 0.04 mm (0.0016 in.)
Middle Compression Ring Groove Clearance ................... 0.04 mm (0.0016 in.)
Top Compression Ring End Gap ................... 0.15-0.40 mm (0.006-0.016 in.)
Middle Compression Ring End Gap ................... 0.30-0.55 mm (0.012-0.022 in.)
Piston Thrust Face O.D ................... 93.928-93.942 mm (3.6980-3.6985 in.)
Piston Thrust Face to Cylinder Bore Clearance ................... 0.0875 mm (0.0034 in.)

Tightening Torque Specs

Cylinder Head Bolt ................... 20.5-41.0 Nm (15-30 ft-lb)
Rocker Arm Pivot Stud ................... 13.5 Nm (10 ft-lb)
Rocker Arm Adjustment Nut Set Screw ................... 5.5 Nm (4.2 ft-lb)
Flywheel Retaining Screw ................... 66.5 Nm (49 ft-lb)
Connecting Rod Cap ................... 11.5 Nm (8.5 ft-lb)
Cam Lever Screw ................... 7.5 Nm (5.4 ft-lb)
Oil Drain Plug ................... 14.0 Nm (10.4 ft-lb)
Fuel Bowl Retaining Screw ................... 5.1-6.2 Nm (3.8-4.6 ft-lb)
Balance Weight Screw ................... 10.0 Nm (7.5 ft-lb)
Air Cleaner Base Mounting Screw ................... 8.0 Nm (5.8 ft-lb)
Electric Starter Mounting Nut ................... 3.6 Nm (2.7 ft-lb)
Ignition Module Screw ................... 6.0 Nm (4.5 ft-lb)
Spark Plug, Nm (ft-lb) ................... 24-30 (18-22)
Muffler Retaining Nuts ................... 24.4 Nm (18 ft-lb)
Oil Filter Mounting Screw ................... 10-13 Nm (7.5-10.1 ft-lb)
Oil Pump Mounting Screw ................... 4.0 Nm (2.9 ft-lb)
Rectifier-Regulator Mounting Screw ................... 6.0 Nm (4.5 ft-lb)
Speed Control Bracket Assembly ................... 11.0 Nm (8.2 ft-lb)
Governor Control Lever ................... 7.0-8.5 Nm (5.2-6.3 ft-lb)