Kohler 20Hp Command V-Twin Engine Electric Start CH20S PA-CH640-3204 Basic 

PA-CH640-3204 20 HP Basic No Panel or Controls

• PA-CH640-3204 Supersedes CH640-3006, CH20S-64500

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

• 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

Model	Command PRO CH640
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

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