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Kohler CH640-3126 Horizontal Engine, Replaces CH640-3110

The Kohler CH640-3126 Command PRO Horizontal Engine is a commercial-grade replacement engine designed for select Simplicity and SunStar equipment. It directly supersedes Kohler CH640-3110 and may also replace CH20S-64512, subject to complete specification verification.

Key Features

  • Commercial-duty Kohler Command PRO engine
  • 674cc four-cycle V-twin OHV design
  • Rated at 20.5 horsepower
  • Maximum torque of approximately 35.7 ft-lb
  • Replaces Kohler CH640-3110
  • Simplicity and SunStar equipment specification
  • Electric start with solenoid-shift starter
  • 15-amp regulated charging system
  • Full-pressure lubrication
  • Spin-on full-flow oil filter
  • Electronic ignition
  • Mechanical fuel pump
  • Dual-element air cleaner with foam pre-cleaner
  • Cast-iron cylinder liners
  • Remote throttle and choke controls
  • Fuel tank and muffler not included

Specifications

Specification Details
Brand Kohler
Series Command PRO
Engine model CH640
Specification number CH640-3126
Manufacturer part number PA-CH640-3126
Replaces CH640-3110
Additional cross-reference CH20S-64512
Original equipment application Simplicity/SunStar
Engine orientation Horizontal shaft
Engine configuration V-twin
Engine cycle Four-cycle
Valve configuration OHV
Displacement 674cc / 41.1 cu. in.
Rated power 20.5 HP
Maximum torque Approximately 35.7 ft-lb
Bore Approximately 3.0 in.
Stroke Approximately 2.6 in.
Compression ratio 8.5:1
Cooling system Forced air
Fuel type Unleaded gasoline
Fuel system Carbureted with mechanical fuel pump
Starting system Electric start
Ignition Electronic
Charging system 15 amp
Governor Mechanical, variable speed
Lubrication system Full pressure
Oil filter Spin-on, full flow
Oil capacity Approximately 2 US qt. / 1.9 L
Air cleaner Dual element with foam pre-cleaner
Control type Remote throttle and choke
PTO shaft diameter 1-1/8 in.
PTO shaft length Approximately 2.79 in.
Keyway 1/4 in.
Crankshaft end 7/16-20 tapped
PTO rotation Counterclockwise when viewed from PTO side
PTO shaft height Approximately 6.125 in.
Fuel tank Not included
Muffler Not included
Approximate dimensions 14 × 17.7 × 19 in.
Approximate dry weight 107 lb
UPC 885612243034
Warranty Three-year limited manufacturer warranty

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