Kohler KT725 Engine: Specifications and technical data (2024)

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General Technical Data

Engine Model .............. Kohler 7000 Series KT725
Engine Type .............. 4-cycle twin-cylinder air-cooled vertical shaft gasoline
Number of Cylinders .............. 2
Displacement, cc (cu.in) .............. 725 (44.2)
Engine Bore, mm (in) .............. 83.0 (3.27)
Engine Stroke, mm (in) .............. 67.0 (2.64)
Rated Engine Power, hp (kW) .............. 22.0 (16.4)
Rated Engine Speed, rpm .............. 3600
Maximum Torque, Nm (ft-lb) .............. 54.8 (40.4)
Torque Speed, rpm .............. 2600
Compression .............. 9.1:1
Lubrication .............. Full pressure
Oil filter .............. Full-flow type
Air Cleaner .............. Replaceable, paper element
Oil Capacity, L (qts) .............. 1.9 (2.0)
Electrical System Rating, Volts .............. 12

Fuel System

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

Dimensions and Weight

Length, mm (in) .............. 471 (18.6)
Width, mm (in) .............. 443 (17.5)
Height, mm (in) .............. 352 (13.9)
Net weight, kg (lbs) .............. 38.5 (85)

Cylinder Block

Cylinder Bore Inside Diameter (Std) .............. 83.006-83.031 mm (3.2679-3.2689 in)
Cylinder Bore Inside Diameter (Wear Limit) .............. 83.069 mm (3.2704 in)
Cylinder Bore (Max. Taper) .............. 0.05 mm (0.002 in)
Cylinder Bore (Max. Out of Round) .............. 0.12 mm (0.0047 in)
Cylinder Head (Max. Out of Flatness) .............. 0.076 mm (0.003 in)
Camshaft End Play .............. 0.06-0.40 mm (0.0024-0.0157 in)
Camshaft Clearance 0.040-0.077 mm (0.0016-0.0030 in)
Camshaft Bore Inside Diameter 20.000-20.025 mm (0.7874-0.7884 in)
Camshaft Bearing Surface Inside Diameter .............. 19.948-19.960 mm (0.7854-0.7858 in)
Connecting Rod to Crankpin Clearance .............. 0.037-0.083 mm (0.0015-0.0033 in)
Connecting Rod to Crankpin Side Clearance .............. 0.261-0.67 mm (0.0102-0.0264 in)
Connecting Rod to Piston Pin Clearance .............. 0.013-0.032 mm (0.0005-0.0013 in)

Valves and Valve Lifters

Cylinder Head (Max. Out of Flatness), mm (in) .............. 0.076 (0.003)
Valve Lash .............. 0.076 mm (0.003 in)
Intake Valve Minimum Lift .............. 8.9 mm (0.350 in)
Exhaust Valve Minimum Lift .............. 8.9 mm (0.350 in)
Valve Face Angle (Intake/Exhaust) .............. 45 degrees
Valve Seat Angle (Intake/Exhaust) .............. 89 degrees
Intake Valve Stem to Valve Guide Clearance .............. 0.038-0.076 mm (0.0015-0.003 in)
Exhaust Valve Stem to Valve Guide Clearance .............. 0.050-0.88 mm (0.0020-0.0035 in)
Intake Valve Guide Inside Diameter .............. 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 Guide Inside Diameter .............. 6.038-6.058 mm (0.2377-0.2385 in)
Exhaust Valve Stem Diameter .............. 5.970-5.988 mm (0.235-0.2357 in)
Intake Valve Insert Outside Diameter .............. 36.987-37.013 mm (1.4562-1.4572 in)
Exhaust Valve Insert Outside Diameter .............. 32.987-33.013 mm (1.2987-1.2997 in)
Intake Valve Guide Depth .............. 4.00 mm (0.1575 in)
Exhaust Valve Guide Depth .............. 6.50 mm (0.2559 in)
Intake Valve Head Diameter .............. 33.37-33.63 mm (1.3138-1.3240 in)
Exhaust Valve Head Diameter .............. 29.37-29.63 mm (1.1563-1.1665 in)
Intake Valve Stem Diameter .............. 6.982-7.000 mm (0.2749-0.2756 in)
Exhaust Valve Stem Diameter .............. 6.970-6.988 mm (0.2744-0.2751 in)

Crankshaft

Crankshaft End Play (Free) .............. 0.075-0.595 mm (0.0030-0.0023 in)
Crankshaft Bore in Crankcase Inside Diameter .............. 40.974-40.987 mm (1.6131-1.6137 in)
Crankshaft Bore in Oil Pan Inside Diameter .............. 40.974-40.987 mm (1.6131-1.6137 in)
Flywheel End Bearing Journal Outside Diameter .............. 40.913-40.935 mm (1.6107-1.6116 in)
Flywheel End Bearing Journal (Max Taper) .............. 0.0220 mm (0.0009 in)
Flywheel End Bearing Journal (Max Out of Round) .............. 0.025 mm (0.001 in)
Oil Pan End Bearing Journal Outside Diameter .............. 40.913-40.935 mm (1.6107-1.6116 in)
Oil Pan End Bearing Journal (Max Taper) .............. 0.020 mm (0.0008 in)
Oil Pan End Bearing Journal (Max Out of Round) .............. 0.025 mm (0.001 in)
Crankshaft Bore in Oil Pan Clearance .............. 0.039-0.087 mm (0.0015-0.0034 in)
Crankshaft Bore in Crankcase Clearance .............. 0.039-0.087 mm (0.0015-0.0034 in)
Connecting Rod Journal Outside Diameter .............. 35.950-35.974 mm (1.4154-1.4163 in)
Connecting Rod Journal (Max. Taper) .............. 0.018 mm (0.0007 in)
Connecting Rod Journal (Max. Out of Round) .............. 0.025 mm (0.001 in)
Crankshaft T.I.R (PTO End, Crankshaft in Engine) .............. 0.279 mm (0.0110 in)
Crankshaft T.I.R (Entire Crankshaft, in V-Blocks) .............. 0.200 mm (0.0079 in)

Piston and Piston Rings

Piston Pin Bore Inside Diameter .............. 17.006-17.012 mm (0.6695-0.6698 in)
Piston Pin Outside Diameter .............. 16.995-17.000 mm (0.6691-0.6693 in)
Piston Pin End Inside Diameter .............. 17.013-17.027 mm (0.6698-0.6704 in)
Top Ring to Groove Side Clearance .............. 0.030-0.070 mm (0.001-0.0026 in)
Middle Ring to Groove Side Clearance .............. 0.030-0.070 mm (0.001-0.0026 in)
Oil Ring to Groove Side Clearance .............. 0.060-0.190 mm (0.0022-0.0073 in)
Top Ring End Gap .............. 0.189-0.277 mm (0.0074-0.0109 in)
Middle Ring End Gap .............. 1.519-1.797 mm (0.0598-0.0708 in)
Piston Thrust Face Outside Diameter .............. 82.978 mm (3.2668 in)
Piston Thrust Face to Cylinder Bore Clearance .............. 0.019-0.062 mm (0.0007-0.0024 in)

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Engines Technical Specifications