Kohler Command CV25S

General Technical Data

Kohler CV25S Engine Specifications

Engine Model ........... Kohler Command CV25S
Engine Type ........... 4-cycle gasoline, OHV, air-cooled
Number of Cylinders ........... V-Twin
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) ........... 25.0 (18.4)
Rated Engine Speed, rpm ........... 3600
Maximum Torque, Nm (ft-lbs) ........... 54.1 (39.9)
Torque Speed, rpm ........... 2800
Compression ........... 9.0:1
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
Starter Type ........... Electric
Battery Rating ........... 12V, 400 CCA

Fuel System

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

Dimensions

Length, mm (in) ........... 480 (19.0)
Width, mm (in) ........... 448 (17.7)
Height, mm (in) ........... 350 (13.8)
Net weight, kg (lbs) ........... 43.0 (94)

Kohler CV25S Maintenance Data

Cylinder Block and Valves

Cylinder Bore I.D. (Maximum), mm (in) ........... 83.051 (3.2697)
Cylinder Head (Max. Out-of-Flatness), mm (in) ........... 0.076 (0.003)
Intake Valve Clearance (Cold), mm (in) ........... 0.038-0.076 (0.0015-0.0030)
Exhaust Valve Clearance (Cold), mm (in) ........... 0.050-0.088 (0.0020-0.0035)

Engine Oil

Engine Oil Type (Summer) ........... SAE 10W-30
Engine Oil Type (Winter) ........... SAE 5W-20, 5W-30
Oil Classification ........... 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)

Carburetor Adjustment

Main Fuel ........... 2-1/2 turns
Idle Fuel ........... 3/4 to 1 full turn
Low Idle Speed, rpm ........... 1200±75
High Idle Speed, rpm ........... 3600±50

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-lbs) ........... 24.4-29.8 (18-22)

Service Intervals

Service Precleaner Element ........... Every 25 hours
Replace Air Cleaner Element ........... Every 100 hours
Change Engine Oil ........... Every 100 hours
Clean Oil Cooler Fins ........... Every 100 hours
Check Carburetor Adjustment ........... Every 100 hours
Check Spark Plug Condition and Gap ........... Every 200 hours
Change Oil Filter ........... Every 200 hours
Replace Spark Plug ........... Every 300 hours
Check and Adjust Valve Clearance ........... Every 300 hours

Kohler CV25S 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.)
Cylinder Head Max. Out-of-Flatness ........... 0.076 mm (0.003 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.)
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.)

Valves

Hydraulic Valve Lifter to Crankcase Clearance ........... 0.0241-0.0501 mm (0.0009-0.0020 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.)
Valve Guide Reamer Size (Standard) ........... 7.048 mm (0.2775 in.)
Valve Guide Reamer Size (0.25 mm Oversize) ........... 7.298 mm (0.2873 in.)
Intake Valve Minimum Lift ........... 8.07 mm (0.3177 in.)
Exhaust Valve Minimum Lift ........... 8.07 mm (0.3177 in.)

Crankshaft

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.)
Flywheel End Main Bearing Journal O.D ........... 40.913-40.935 mm (1.6107-1.6116 in.)
Flywheel End Main Bearing Journal Max. Taper ........... 0.022 mm (0.0009 in.)
Oil Pan End Main Bearing Journal O.D ........... 40.913-40.935 mm (1.6107-1.6116 in.)
Oil Pan End Main Bearing Journal Max. Taper ........... 0.022 mm (0.0009 in.)
Connecting Rod Journal O.D ........... 35.955-35.973 mm (1.4156-1.4163 in.)
Connecting Rod Journal Max. Taper ........... 0.018 mm (0.0007 in.)
Crankshaft T.I.R (PTO End, Crank in Engine) ........... 0.279 mm (0.0110 in.)
Crankshaft T.I.R (Entire Crank, in V-Blocks) ........... 0.10 mm (0.0039 in.)

Piston and Piston Rings

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 Compression Ring-to-Groove Side Clearance ........... 0.025-0.048 mm (0.0010-0.0019 in.)
Middle Compression Ring-to-Groove Side Clearance ........... 0.015-0.037 mm (0.0006-0.0015 in.)
Oil Control Ring-to-Groove Side Clearance ........... 0.026-0.176 mm (0.0010-0.0070 in.)
Top and Middle Compression Ring End Gap ........... 0.25-0.56 mm (0.0100-0.0224 in.)
Piston Thrust Face O.D ........... 82.986 mm (3.3194 in.)
Piston Thrust Face-to-Cylinder Bore Clearance ........... 0.001-0.045 mm (0.039-0.0018 in.)

Kohler CV25S Tightening Torque Specs

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