Kohler 20Hp Command Basic V-Twin Engine Electric Start CH20S CH640-3205 supersedes CH640-3004, CH20S-64503 20 HP
CH640-3205 supersedes CH640-3004, CH20S-64503 20 HP W/PANEL 1-1/8 LWVAC
Item# 28065
Shaft 1-1/8" (28.550 mm)_PTO Mtg Face 4" (101.5 mm)_7/16-20
 
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Durable, Long Life Design.
Hydraulic valve lifters are oil pressurized, ensuring that push rods stay in constant contact with the rocker arms. Requiring no adjustment, the valve train is virtually maintenance-free. In addition, full-pressure lubrication delivers continuous lube to critical engine components, even at 25-degree angle of operation and optional oil cooler regulates the oil temperature extending oil-change intervals. Large capacity, in-line fuel filter provides extra protection against dirt particles that can clog fuel lines.
High Power Performance.
Overhead valve technology provides greater volumetric efficiency and a higher compression ratio. This produces more power, improved fuel economy and cooling and reduces oil consumption. In addition, there is virtually no carbon buildup, reducing overall maintenance costs. The variable speed, mechanical governor promises smooth performance, regardless of application or fluctuating demands for power.
Reliable Starting.
Kohler Command PRO® electronic ignition system generates a stronger spark at low cranking speed and Automatic Compression Release (ACR) allows compression to escape during cranking to reduce pull force.
User-Friendly Maintenance.
- Extended maintenance intervals
- Yellow oil fill cap & dipstick handle
- Dual oil drains
- Easy-access oil fill/dipstick
- Two-year limited warranty
High Power Performance.
- High-performance spark plugs
- 20 amp charging, regulated
- Larger in-line fuel filter
- Overhead valve (OHV) design
Reliability and Long Life Design.
- Hardened crankshaft journals
- High-efficiency fan and screen
- Larger dual-element air filter with foam pre-cleaner
- Cast iron cylinder liners
- Hydraulic valve lifters
- Full-pressure lubrication
- Spin-on, full-flow oil filter
Quiet, Smooth Operation.
- Engineered material blower housing
- Mechanical fuel pump
- CARB & EPA emission-certified
Easy Dependable Starts.
- Smart-Choke™ carburetor
- Electronic ignition system
- Solenoid shift starter
Full pressure lubrication. 20 Amp alternator. Pulse fuel pump. Satellite exhaust valves with seat inserts and rotators.
Shaft 1-1/8" (28.550 mm)_PTO Mtg Face 4" (101.5 mm)_7/16-20 shaft is drilled and tapped 5/8"-18: has 3/8" keyway. Two limited warranty.
Overhead Valve Design OHV
• Hydraulic Valve Lifters
• Cast-Iron Cylinder Liners
• Electronic Ignition
• Large Capacity Dual Element Air Cleaner
• High Efficiency Grass Screen and Fan
• Closed Breather System
• Stellite® Exhaust Valves
• Full Pressure Lubrication
• Large Capacity In-Line Fuel Filter
• Easy Access Valve Cover Oil Fill-Yellow
• Oil Level Dipstick-Yellow
• Large Capacity Oil Filter, Dual Oil Drain
• Oil Sentry™ (Switch Installed and Wired but Unconnected)
• Variable Speed Governor
• Fuel Shutdown Solenoid, Smart-Choke™ Carburetor
• Mechanical Fuel Pump
• High Performance Spark Plugs
• 12 Volt Solenoid Shift Starter
• 20 Amp Alternator, Regulated
• Crankshaft-1.437" (36 mm) Diameter x 4.453" (113 mm) PTO Length, 0.375" (9.5 mm) Keyway, Drilled and Tapped 1.5" (38 mm) Deep, 5/8-18 UNF
• PTO Face-5.625" (143 mm) Diameter, (4 Holes) 3/8-16 x 0.67" (17 mm) Deep, 7.75" (197 mm) Diameter, (4 Holes) 7/16-14 x 0.83" (21 mm) Deep
Color Black with Cast Aluminum
7" (178mm) Diameter Pilot
Exact Specifications Subject To Change Without Notice.
Standard Features Plus:
• 3/16" Evaporative Emissions Connection
Engine Type:
4-cycle, gasoline, OHV, cast iron cylinder liners, aluminum block
| Max Power @3600 RPM hp (kW) 1 |
20 (14.9) |
| Displacement cu in (cc) |
39.1 (624) |
| Bore in (mm) |
3.0 (77) |
| Stroke in (mm) |
2.6 (67) |
| Max Torque lbs. ft (Nm)1 |
32.7 (44.3) |
| Compression Ratio |
8.5:1 |
| Dry Weight lbs (kg) |
90 (41) |
| Oil Capacity U.S. quarts (L) |
2 (1.9) |
| Lubrication |
Full pressure w/full-flow filter |
| Dimensions L x W x H in |
14 x 17.7 x 19.0 |
| Backpressure Limit 2 |
50 |
| J1995 Power hp (kW) 3 |
20.6 (15.4) |
| J1995 Torque lbs ft (Nm) 3 |
31.6 (42.8) |
* Length is grass screen to PTO mounting face. Width is spark plug to spark plug. Height is top of air cleaner to mounting feet.
1 Max Power (hp) and Max Torque (lbs ft) specifications for Kohler general purpose engines are rated pursuant to Society of Automotive Engineers (SAE) J1940 based on gross output testing performed according to SAE J1995 without the air cleaner and muffler. Actual engine power and torque are lower and affected by accessories (air cleaner, exhaust, charging, cooling, fuel pump, etc.), application, engine speed, ambient operating conditions (temperature, humidity and altitude) and other factors. This J1940 / J1995 rating provides consistent measurement to customers who may want to control the intake and exhaust features of the engine. For more information, contact Kohler Co. Engine Engineering Department. Kohler Co. reserves the right to change product specifications, designs and standard equipment without notice and without incurring obligation.
2 Inches of H20 @ 3600 RPM WOT
3 J1995 power and torque certified by 3rd Party Witness
Service Manual
Sales Brochure
Quick Reference Parts Guide
Kohler Warranty
Owners Manual
106 lbs
Kohler 20Hp Command V-Twin Engine Electric Start CH20S CH640-3004 Basic
Overview
Kohler 20 HP Command V-Twin Horizontal Engine. For Simplicity Sun Star garden tractor. This gasoline-driven, 4-cycle, 20 HP engine has reliable features, including: OHV, cast iron V-Twin cylinder liners, and aluminum block construction.
Features + Benefits
Hydraulic valve lifters are oil-pressurized, ensuring that push rods stay in constant contract with the rocker arms
- The valve train is virtually maintenance-free and requires no adjustment
- Full-pressure lubrication delivers continuous lube to critical engine components, even at 25° angle of operation
- Large capacity, in-line fuel filter provides extra protection against fuel line-clogging dirt particles
- Overhead valve technology provides greater volumetric efficiency and a higher compression ratio, providing more power, improved fuel economy, reduced oil consumption and better cooling
- Virtually no carbon buildup for reduced maintenance costs
- The variable speed mechanical governor promises smooth performance, regardless of application or fluctuating demands for power
- The Kohler Command® electronic ignition system generates a stronger spark at lower cranking speeds and the Automatic Compression Release (ACR) system allows compression to escape during cranking to reduce pull force for reliable starts
- Easy maintenance, thanks to easy-access oil fill cap and dipstick handle and dual oil drains
- High power performance, with high-performance spark plugs, a 15 Amp regulated alternator and a large in-line fuel filter
- Reliable, long-life design with hardened crankshaft journals, high-efficiency fan and screen, large dual-element air filter with foam pre-cleaner, cast iron cylinder liners and a spin-on, full-flow oil filter
- Quiet, smooth operation thanks to an engineered material blower housing and a mechanical fuel pump
- CARB and EPA-emission certified
- Smart-Choke® carburetor
- Electronic ignition system
- Solenoid shift starter
What's Included
- (1) Engine
-
Key Specs
| Air Cleaner Type |
Large capacity dual element |
| Fuel Type |
Gasoline |
| Fuel Pump |
Mechanical |
| Fuel Filter |
Large capacity in-line |
| Oil Capacity (qt.) |
2 |
| Lubrication System |
Full pressure |
| Low Oil Alert |
Oil Sentry |
| Low Oil Shutdown |
Oil Sentry |
| Ignition System |
Electronic |
| Governor System |
Variable speed |
| Carburetor |
Smart Choke |
| Throttle Control |
Engine-mounted |
| Choke Control |
Smart Choke |
| Max. RPM |
3,600 |
| Charging System Amps |
20 |
| Muffler Included |
No |
| Bolt Circle (in.) |
7 |
| Mounting Base L x W (in.) |
7 1/4 x 3 1/2 |
| Mounting Bolt Pattern L x W (in.) |
7 1/4 x 3 1/2 |
| Dimensions L x W x H (in.) |
14 x 17.7 x 19 |
| EPA/CARB Approval (California Air Resource Board) |
Yes |
20110823sdw
Kohler PA-CH640-3205 20Hp Command Pro Basic Horizontal Engine GTIN: N/A [PA-CH640-3205]
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