Kohler Engines. Relentless Power. Legendary Performance.

6600 Series

KT620

KT620

Get professional-grade features in an engine perfectly sized for garden tractors and small ZTRs. The air-cooled, V-twin 6600 Series™ engine is identical to the popular KOHLER® 7000 Series™ but with a more compact profile that fits into tight applications.

HP
Shaft
Cylinders
Cooling
Fuel Type
Status
21 Vertical V-Twin Air Current
Overview
Features
Engine Uses
Specs
Overview

Professional Grade Design.

Based on KOHLER's commercial Command PRO® engine design. Featuring pressure lubrication extends engine life by keeping critical components well-lubricated.

High Power Performance.

Consistent-Cut™ technology maintains engine speed for a cleaner turf cut and a beautiful lawn, even in tough mowing conditions, so your lawn looks great with every cut. Optional PRO Performance filtration package delivers maximum protection from dirt and debris with increased air, oil and fuel filter capacity. Designed with lower vibration for a more comfortable ride (compared to the 7000 Series™ engine).

Features

High Power Performance.

  • Dual-sealed air filter. Optional PRO Performance filtration package delivers maximum protection from dirt and debris with increased air, oil and fuel filter capacity.

Easy Dependable Starts.

  • Get reliable starting, hot or cold, even at temperatures below freezing with Smart-Choke™ technology. There's no need to choke the engine - starts at any throttle position. Adds just the right amount of fuel during starting.
Engine Uses
Riding Mower
Zero Turn Mower

Equipment Types

This engine powers the following equipment:

  • Yard Tractor
  • Mower, Zero Turn Radius
Specs

Engine Type:

Four-cycle, single-cylinder, air-cooled, vertical shaft, gasoline, OHV, with cast iron liner.

Model
KT620
J1940 Power hp(kW) 1 21 (15.66)
Displacement cu in (cc) 40.3 (660)
Bore in (mm) 3.3 (83)
Stroke in (mm) 2.4 (61)
Peak Torque lbs. ft (Nm) ()
Compression Ratio 9.1:1
Dry Weight lbs (kg) 82 (37.2)
Oil Capacity U.S. quarts (L) 2 (1.9)
Lubrication Full pressure w/full-flow filter
Dimensions L x W x H in 18.6 x 16.7 x 13.4
J1995 Power hp (kW) 3 20.41 (15.22)
J1995 Rated Speed (RPM)  3600
* Length is valve cover to end of blower housing. Width is blower housing width. Height is mounting feet to top of cyclonic air cleaner.
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.

3 J1995 power and torque certified by 3rd Party Witness