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Kohler CV745 EFI Engine

The Kohler CV745 is a 4-cycle V-twin cylinder OHV vertical shaft air-cooled gasoline engine from Command PRO EFI series. A 44 cubic inches (0.73 L) engine has a cylinder bore of 3.27" (83 mm), piston stroke of 2.64" (67 mm), and rated power of 28 Hp (20.9 kW) at 3600 rpm. The compression ratio rating is 9:1. The Kohler CV745 engine is equipped with an electronic fuel injection system, pressurized lubrication system, electronic spark ignition, paper element air cleaner, and bendix type electric starter. The operating weight is 94.5 lbs (43 kg).

General Technical Data

Engine Specifications

Engine Model ................... Kohler Command PRO CV745 EFI
Engine Type ................... 4-cycle V-Twin OHV air-cooled gasoline
Number of Cylinders ................... 2
Displacement, cc (cu.in) ................... 725 (44.0)
Engine Bore, mm (in) ................... 83.0 (3.27)
Engine Stroke, mm (in) ................... 67.0 (2.64)
Rated Engine Power, hp (kW) ................... 28.0 (20.9)
Rated Engine Speed, rpm ................... 3600
Maximum Torque, Nm (ft-lbs) ................... 60.1 (44.3)
Torque Speed, rpm ................... 2800
Compression Ratio ................... 9.0:1
Fuel System ................... Electronic fuel injection (EFI)
Lubrication System ................... Full pressure
Oil Filter Type ................... Full-flow type
Air Cleaner Type ................... Replaceable, paper element
Cooling System .................. Forced-air
Ignition System .................. Electronic
Starter Type ................... Electric
Battery Rating ................... 12V, 400 CCA
Electrical System Rating, Volts ................... 12

Dimensions and Weight

Overall Length, mm (in) ................... 538 (21.2)
Overall Width, mm (in) ................... 450 (17.7)
Overall Height, mm (in) ................... 363 (14.3)
Net weight, kg (lbs) ................... 43.0 (94.5)

Maintenance Data

Engine Oil

Engine Oil Type (Summer) ................... SAE 10W-30
Engine Oil Type (Winter) ................... SAE 5W-20, 5W-30
Oil Classification (API) ................... SG, SH, SJ, or higher
Oil Capacity (w/o Filter), L (qts) ................... 1.7 (1.8)
Oil Capacity (with New Filter), L (qts) ................... 1.9 (2.0)

Ignition System

Spark Plug Type ................... Champion RC12YC
Spark Plug Gap, mm (in) ................... 0.76 (0.030)
Module Air Gap, mm (in) ................... 0.28-0.33 (0.011-0.013)
Thread Size, mm (in) ................... 14 (0.55)
Reach, mm (in) ................... 19.1 (0.75)
Spark Plug Torque, Nm (ft-lb) ................... 24.4-29.8 (18-22)

Service Specifications

Cylinder Block

Cylinder Bore I.D (Standard) ................... 82.988-83.013 mm (3.2672-3.2682 in)
Cylinder Bore I.D (Max. Wear Limit) ................... 83.051 mm (3.2697 in)
Cylinder Bore (Max. Out-of-Round) ................... 0.12 mm (0.0047 in)
Cylinder Bore Max Taper ................... 0.05 mm (0.0020 in)
Connecting Rod to Crankpin Clearance ................... 0.030-0.055 mm (0.0012-0.0022 in)
Connecting Rod to Crankpin Side Clearance ................... 0.26-0.63 mm (0.0102-0.0248 in)
Connecting Rod to Piston Pin Clearance ................... 0.015-0.028 mm (0.0006-0.0011 in)
Crankshaft End Play (Free) ................... 0.070-0.590 mm (0.0028-0.0230 in)
Crankshaft Bore (In Crankcase) ................... 40.965-41.003 mm (1.6128-1.6143 in)
Crankshaft to Sleeve Bearing Clearance ................... 0.03-0.09 mm (0.0012-0.0035 in)
Crankshaft Bore ................... 40.987-40.974 mm (1.6136-1.6131 in)
Crankshaft Bore to Crankshaft Clearance ................... 0.039-0.074 mm (0.0015-0.0029 in)
Connecting Rod Journal O.D ................... 35.955-35.973 mm (1.4156-1.4163 in)
Piston to Piston Pin Clearance ................... 0.006-0.017 mm (0.0002-0.0007 in)
Piston Pin End I.D ................... 17.015-17.023 mm (0.6699-0.6702 in)
Piston Pin Bore I.D ................... 17.006-17.012 mm (0.6695-0.6698 in)
Piston Pin O.D ................... 16.995-17.000 mm (0.6691-0.6693 in)
Top Ring Side Clearance (Piston A) ................... 0.025-0.048 mm (0.0010-0.0019 in)
Middle Ring Side Clearance (Piston A) ................... 0.015-0.037 mm (0.0006-0.0015 in)
Oil Ring Side Clearance (Piston A) ................... 0.026-0.176 mm (0.0010-0.0070 in)
Top Ring End Gap (Piston A) ................... 0.25-0.56 mm (0.0100-0.0224 in)
Middle Ring End Gap (Piston A) ................... 0.25-0.56 mm (0.0100-0.0224 in)
Top Ring Side Clearance (Piston B) ................... 0.030-0.070 mm (0.001-0.0026 in)
Middle Ring Side Clearance (Piston B) ................... 0.030-0.070 mm (0.001-0.0026 in)
Oil Ring Side Clearance (Piston B) ................... 0.060-0.190 mm (0.0022-0.0073 in)
Top Ring End Gap (Piston B) ................... 0.189-0.277 mm (0.0074-0.0109 in)
Middle Ring End Gap (Piston B) ................... 1.519-1.797 mm (0.0598-0.0708 in)

Cylinder Head and Valves

Cylinder Head Max Out-of-Flatness ................... 0.076 mm (0.003 in)
Hydraulic Lifter to Crankcase Clearance ................... 0.0241-0.0501 mm (0.0009-0.0020 in)
Intake Valve Head Diameter .................. 33.370-33.630 mm (1.3138-1.324 in)
Exhaust Valve Head Diameter .................. 29.370-29.630 mm (1.1563-1.1665 in)
Intake Valve Stem O.D (Standard) .................. 6.982-7.000 mm (0.2749-0.2756 in)
Exhaust Valve Stem O.D (Standard) .................. 6.970-6.988 mm (0.2744-0.2751 in)
Intake Valve Stem to Valve Guide Clearance ................... 0.038-0.076 mm (0.0015-0.0030 in)
Exhaust Valve Stem to Valve Guide Clearance ................... 0.050-0.088 mm (0.0020-0.0035 in)
Intake Valve Guide I.D ................... 7.038-7.058 mm (0.2771-0.2779 in)
Exhaust Valve Guide I.D ................... 7.038-7.058 mm (0.2771-0.2779 in)
Intake Valve Minimum Lift ................... 8.07 mm (0.3177 in)
Exhaust Valve Minimum Lift ................... 8.07 mm (0.3177 in)
Camshaft End Play (With Shim) ................... 0.076-0.127 mm (0.0030-0.0050 in)
Camshaft Clearance ................... 0.025-0.063 mm (0.0010-0.0025 in)
Camshaft Bore I.D ................... 20.000-20.025 mm (0.7874-0.7884 in)
Camshaft Bearing Surface O.D ................... 19.962-19.975 mm (0.7859-0.7864 in)

Tightening Torque Specs

Cylinder Head Flange Nut ................... 16.9-33.9 Nm (12.5-25 ft-lb)
Cylinder Head Bolt ................... 22.6-41.8 Nm (16.7-30.8 ft-lb)
Rocker Arm Screw ................... 11.3 Nm (8.3 ft-lb)
Connecting Rod Cap ................... 22.7 Nm (16.7 ft-lb)
Flywheel Retaining Screw ................... 66.4 Nm (49 ft-lb)
Intake Manifold Mounting ................... 7.4 Nm (5.5 ft-lb)
Carburetor Mounting Nut ................... 6.2-7.3 Nm (4.6-5.4 ft-lb)
Oil Drain Plug ................... 13.6 Nm (10 ft-lb)
Oil Pan Screw ................... 24.4 Nm (18 ft-lb)
Governor Lever Nut ................... 6.8 Nm (5 ft-lb)
Ignition Module ................... 4.0-6.2 Nm (2.9-4.6 ft-lb)
Oil Filter Screw ................... 10.4-12.7 Nm (7.5-9.2 ft-lb)

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