Kohler Engines. Relentless Power. Legendary Performance.

Command PRO Horizontal



This gasoline engine features a 4-cycle, slant cylinder design, with a cast iron cylinder bore and overhead valve for easy access. The Quad-Clean™ 4-stage air filtration system ensures only clean air enters the engine for maximum power and life of the engine. In addition, this engine is backed by a 3 year commercial warranty.

Fuel Type
5.5 Horizontal Single Air New
Engine Uses


Industry standard PTO face provides flexibility to power any application without modification to the equipment. Dual oil fills and drains and easy access throttle, choke and shutoff make operating and maintaining this engine a breeze.

Durable, Long Life Design.

Features steel-forged crankshaft, cast iron cylinder bore, tough Stellite® faced exhaust valve with Tuftride® coated stems and dual ball bearings for maximum side load characteristics. Also, the Quad-Clean™ four-stage cyclonic air filtration system ensures only the cleanest air is entering the engine, maximizing engine power and life.

Increased Efficiency.

The KOHLER advanced ignition system reduces fuel consumption , while the large capacity fuel tank allows for longer runs between fill-ups. Combined, these two features will save you time and money.

Comfortable Operation.

A fully integrated system, including oversized muffler, sound-deadening alloy crankcase and silenced air intake provide smoother, quieter performance.

Reliable Starting.

In colder months the Quad-Clean™™ air filter cover can be reconfigured, no tools required and in a matter of seconds, to recycle engine heat. Along with the advanced electronic ignition, automatic compression release, and dual ball bearings the Command PRO® provides effortless starts in all weather and conditions.


User-Friendly Maintenance.

  • Industry standard PTO face
  • Dual oil fills and drains
  • No tools required all season air cleaner
  • Easy access throttle, choke and shutoff
  • Oil Sentry™ automatic low oil engine shutdown system
  • Carburetor bowl drain

High Power Performance.

  • Overhead valve design
  • Large displacement
  • High-inertia flywheel

Extended Run Times.

  • Large metal fuel tank
  • Swirl induction combustion chamber

Quiet, Smooth Operation.

  • Oversized muffler with heat shield
  • Mechanical governor
  • Sound-deadening alloy crankcase
  • Silenced air intake

Easy Dependable Starts.

  • Electronic ignition system
  • Automatic compression release
  • Dual ball bearings
  • Indexable, easy pull recoil starter

Reliability and Long Life Design.

  • Quad-Clean™ heavy-duty cyclonic air cleaner
  • Warm air intake system for cold weather operation
  • Cast iron cylinder bore
  • Steel-forged crankshaft
  • Stellite-faced exhaust valve
  • Water trap to separate moisture in fuel
  • 3 fuel filters: fill neck, in tank, and carburetor inlet
  • 3 year commercial warranty
Engine Uses
Power Generation/Welder
Recreational Vehicles
Utility Equipment

Equipment Types

This engine powers the following equipment:

  • Concrete Trowel
  • Pump, Water
  • Hydraulic Power Pack
  • Pump - Other
  • Welder
  • Go-Kart
  • Utility Vehicle
  • Chipper/Shredder
  • Logsplitter
  • Pump, Water
  • Shredder
  • Tamper/Plate Compactor
  • Compressor
  • Portable Generator
  • Pump - Other
  • Stump Grinder/Cutter
  • Welder

Engine Type:

4-cycle, gasoline, OHV, cast iron cylinder liners, aluminum block

Command PRO CH255
J1940 Power hp(kW) 1 5.5 (4)
Displacement cu in (cc) 10.8 (177)
Bore in (mm) 2.7 (68)
Stroke in (mm) 1.9 (49)
Peak Torque lbs. ft (Nm) 11.2 (8.3)
Compression Ratio 8.5:1
Dry Weight lbs (kg) 17 (7.7)
Oil Capacity U.S. quarts (L) 0.63 (0.6)
Lubrication Splash
Dimensions L x W x H in 11.6 x 13.9 x 12.5
* Measurements are based on a recoil-start engine.
1 Power (hp) and 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.