Kohler CH15S Specifications
| Engine Model: Kohler Command CH15S |
| Engine Type: 4-cycle single-cylinder horizontal shaft air-cooled gasoline |
| Total Displacement: 26 cu.in (426 cc) |
| Rated Engine Power: 15 Hp (11.2 kW) at 3600 rpm |
| Carburetor Type: Adjustable or fixed main jet |
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Engine Model .............. Kohler Command CH15S
Engine Type .............. 4-cycle 1-cylinder horizontal shaft air-cooled gasoline engine
Number of Cylinders .............. 1
Displacement, cc (cu.in) .............. 426 (26.0)
Engine Bore, mm (in) .............. 90.0 (3.53)
Engine Stroke, mm (in) .............. 67.0 (2.64)
Maximum Engine Power, hp (kW) .............. 15.0 (11.2)
Maximum Engine Speed, rpm .............. 3600
Maximum Torque, Nm (ft-lb) .............. 34.3 (25.3)
Torque Speed, rpm .............. 2400
Idle Speed, rpm .............. 1400
Compression Ratio .............. 8.5:1
Lubrication System .............. Full pressure
Oil Filter Type .............. Full-flow
Air Cleaner Type .............. Replaceable, paper element
Ignition System .............. Electronic magneto
Starting System .............. Electric starter
Electrical System Rating, Volts .............. 12
Fuel System Type .............. Carburetor
Carburetor Model .............. Walbro or Nikki
Carburetor Type .............. Adjustable main jet or fixed jet
Fuel Pump Type .............. Mechanical
Fuel Filter Type .............. In-line
Governor Type .............. Mechanical
Overall Length, mm (in) .............. 344 (13.6)
Overall Width, mm (in) .............. 503 (19.8)
Overall Height, mm (in) .............. 448 (17.7)
Net weight, kg (lbs) .............. 40.0 (88)
Cylinder Bore Inside Diameter (Std), mm (in) .............. 90.000-90.025 (3.5433-3.5442)
Cylinder Bore Inside Diameter (Max), mm (in) .............. 90.063 (3.5457)
Cylinder Bore (Max. Out of Round), mm (in) .............. 0.12 (0.0047)
Cylinder Bore Max. Taper, mm (in) .............. 0.05 (0.0020)
Crankshaft End Play (Free), mm (in) .............. 0.0575-0.4925 (0.0022-0.0193)
Crankshaft Bore (Crankcase), mm (in) .............. 44.965-45.003 (1.7703-1.7718)
Crankshaft Bore (Closure Plate), mm (in) .............. 41.960-42.035 (1.6519-1.6549)
Crankshaft Bore to Crankshaft Clearance, mm (in) .............. 0.025-0.120 (0.00098-0.00472)
Connecting Rod to Crankpin Clearance, mm (in) .............. 0.030-0.055 (0.0012-0.0022)
Connecting Rod to Crankpin Side Clearance, mm (in) .............. 0.18-0.41 (0.007-0.016)
Connecting Rod to Piston Pin Clearance, mm (in) .............. 0.015-0.028 (0.0006-0.0011)
Connecting Rod Journal Outside Diameter, mm (in) .............. 38.958-38.970 (1.5338-1.5343)
Camshaft End Play, mm (in) .............. 0.0875-0.3925 (0.0034-0.0154)
Camshaft Clearance, mm (in) .............. 0.025-0.105 (0.00098-0.0041)
Camshaft Bore Inside Diameter, mm (in) .............. 20.000-20.025 (0.7874-0.7884)
Camshaft Bearing Outside Diameter, mm (in) .............. 19.962-19.975 (0.7859-0.7864)
Cylinder Head (Max Out of Flatness), mm (in) .............. 0.076 (0.003)
Hydraulic Valve Lifter to Crankcase Clearance, mm (in) .............. 0.0124-0.0501 (0.0005-0.0020)
Valve Stem to Valve Guide Clearance (Intake), mm (in) .............. 0.038-0.076 (0.0015-0.0030)
Valve Stem to Valve Guide Clearance (Exhaust), mm (in) .............. 0.050-0.088 (0.0020-0.0035)
Valve Guide Inside Diameter, mm (in) .............. 7.038-7.058 (0.2771-0.2779)
Valve Minimum Lift (Intake), mm (in) .............. 8.96 (0.353)
Valve Minimum Lift (Exhaust), mm (in) .............. 9.14 (0.360)
Valve Face Angle, degrees .............. 45
Valve Seat Angle, degrees .............. 89
Valve Insert Outside Diameter (Intake), mm (in) .............. 37.987-38.013 (1.5015-1.5024)
Valve Insert Outside Diameter (Exhaust), mm (in) .............. 34.013-33.987 (1.3443-1.3434)
Valve Guide Depth, mm (in) .............. 6.50 (0.2559)
Valve Head Diameter (Intake), mm (in) .............. 35.63-35.37 (1.4083-1.3980)
Valve Head Diameter (Exhaust), mm (in) .............. 31.63-31.37 (1.2502-1.2399)
Valve Stem Diameter (Intake), mm (in) .............. 6.982-7.000 (0.2749-0.2756)
Valve Stem Diameter (Exhaust), mm (in) .............. 6.970-6.988 (0.2744-0.2751)
Piston Outside Diameter (Std), mm (in) .............. 89.951-89.969 (3.5413-3.5420)
Piston Outside Diameter (Wear Limit), mm (in) .............. 89.824 (3.5363)
Piston to Cylinder Bore Clearance, mm (in) .............. 0.031-0.043 (0.0012-0.0016)
Piston to Piston Pin Clearance, mm (in) .............. 0.006-0.017 (0.0002-0.0007)
Piston Pin Bore Inside Diameter, mm (in) .............. 19.006-19.012 (0.7483-0.7485)
Piston Pin Outside Diameter, mm (in) .............. 18.995-19.000 (0.7478-0.7480)
Top Ring Groove Clearance, mm (in) .............. 0.060-0.105 (0.0023-0.0041)
Second Ring Groove Clearance, mm (in) .............. 0.040-0.072 (0.0016-0.0028)
Oil Ring Groove Clearance, mm (in) .............. 0.176-0.026 (0.0069-0.0010)
Top Ring End Gap, mm (in) .............. 0.27-0.51 (0.010-0.020)
Second Ring End Gap, mm (in) .............. 0.27-0.51 (0.010-0.020)
Spark Plug Type .............. Champion RC12YC
Spark Plug Gap, mm (in) .............. 1.01 (0.040)
Module Air Gap, mm (in) .............. 0.2-0.3 (0.008-0.012)
Engine Oil Type (Summer Time) .............. SAE 10W-30
Engine Oil Type (Winter Time) .............. SAE 5W-20, 5W-30
Oil Classification (API) .............. SG, SH, SJ, or higher
Oil Capacity, L (qts) .............. 1.9 (2.0)
Oil Filter Part Number .............. 52 050 02-S or 12 050 01-S
Fuel Filter Part Number .............. 25 050 21-S
Air Filter Element Part Number .............. 47 083 01-S
Air Filter Pre-Cleaner Part Number .............. 52 083 01-S
Main Fuel .............. 1-1/2 turns
Idle Fuel .............. 1-1/4 turns
Low Idle Speed, rpm .............. 1500±75
High Idle Speed, rpm .............. 3600±50
Service Precleaner .............. Every 25 hours
Check Oil Level in Gear Reduction Unit .............. Every 50 hours
Replace Air Cleaner Element .............. Every 100 hours
Change Engine Oil .............. Every 100 hours
Clean Cooling Areas .............. Every 100 hours
Change Oil Filter .............. Every 200 hours
Check Spark Plug Gap .............. Every 200 hours
Replace Fuel Filter .............. Every 200 hours
Check Carburetor Adjustment .............. Every 200 hours
Check and Adjust Valve Clearance .............. Every 300 hours
Replace Spark Plug .............. Every 300 hours
Cylinder Head, Nm (ft-lb) .............. 24, 48.9 (18, 36)
Rocker Arm Screw, Nm (ft-lb) .............. 11.3 (8.3)
Flywheel Retaining Screw, Nm (ft-lb) .............. 66.4 (49.1)
Connecting Rod Cap, Nm (ft-lb) .............. 11.3 (8.3)
Carburetor Mounting Nut, Nm (ft-lb) .............. 6.2 (5.4)
Closure Plate, Nm (ft-lb) .............. 24.4 (18.1)
Air Cleaner Nut, Nm (ft-lb) .............. 9.9 (7.3)
Fuel Pump Screw, Nm (ft-lb) .............. 4.2-5.1 (3.1-3.8)
Spark Plug, Nm (ft-lb) .............. 38.0-43.4 (28-32)
Ignition Module, Nm (ft-lb) .............. 4.0-6.2 (2.9-4.6)
Muffler Retaining Nut, Nm (ft-lb) .............. 24.4 (18.1)
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