Kohler TH650

Kohler TH650The Kohler TH650 is a 653 cc (39.8 cu·in) V-twin air-cooled four-stroke internal combustion gasoline engine from the Triad series, manufactured by Kohler Co.

The Kohler TH650 engine has an OHC (overhead camshaft) design, an aluminum block with cast iron cylinder liners, a horizontal PTO-shaft, fuul-pressurized lubrication system, replaceable high-density paper air cleaner. This engine is equipped with a carburetor with a fixed main jet, electronic ignition system (CDI).

A 80.0 mm (3.15 in) cylinder bore and 65.0 mm (2.56 in) piston stroke give the TH650 engine a total of 653 cc of displacement. The compression ratio rating is 8.8:1.

This engine produced 20.3 PS (14.9 KW; 20.0 HP) at 3,600 rpm of horsepower and 45.1 Nm (4.6 kg·m; 33.3 ft·lb) at 2,500 rpm of torque.

The breakdown of the engine code is as follows:

  • T – Triad series
  • H – Horizontal PTO shaft
  • 650 – Displacement 650 cc

General information

Engine Specifications
ModelTriad TH650
Type4-stroke, OHV, V-twin
Displacement653 cm 3 (39.8 cu-in)
Max. horsepower20.3 PS (14.9 KW; 20.0 HP) at 3,600 rpm
Max. torque45.1 Nm (4.6 kg·m; 33.3 ft·lb) at 2,500 rpm
Fuel systemCarburetor with a fixed main jet
Cooling systemForced-air
Ignition systemElectronic ignition (CDI)
Lubricating systemFull-pressure lubrication
Starting systemRecoil or electic starter
Fuel usedUnleaded gasoline (octane number 86 or higher)
Dimensions (L x W X H)328 x 400 x 449 mm (12.9 x 15.7 x 17.7 in)
Dry weight43.0 kg (90.0 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:8.4:1
Bore x Stroke80.0 mm X 65.0 mm (2.15 x 2.56 in)
Cylinder Head
Valve Arrangement:OHC, belt driven
Valves:2 (4 in total)
Valve head diameter:INTAKE29.180-29.430 mm (1.1488-1.1586 in)
EXHAUST26.300-26.700 mm (1.0354-1.0512 in)
Stem outer diameter:INTAKE5.982-6.000 mm (0.2355-0.2362 in)
EXHAUST5.970-5.988 mm (0.2350-0.2357 in)

Tightening torque specs

Tightening torque specs
Connecting rod11.3 Nm (1.2 kgf·m; 8.3 ft·lb)
Oil drain plug16.3 Nm (1.7 kgf·m; 12.0 ft·lb)
Oil filter5.6-9.0 Nm (0.6-0.9 kgf·m; 4.1-6.6 ft·lb)
Muffler retaining nuts24.4 Nm (2.5 kgf·m; 18 ft·lb)
Valve cover5.6 Nm (0.6 kgf·m; 4.1 ft·lb)
Flywheel66.4 Nm (6.77 kg·m; 49 ft·lb)
Spark plug24.4-29.8 Nm (2.5-3 kgf·m; 18-22 ft·lb)

Service Information

Valve clearance
Intake0.013-0.064 mm (0.0005-0.0025 in)
Exhaust0.076-0.127 mm (0.0030-0.0050 in)
Oil system
Oil typeAPI SG, SH, SJ, or higher
Recommended oilSAE 10W-30
Oil capacity1.4 liters (1.48 US.qts, 1.23 Imp. qts)
Ignition system
Spark plugChampion RC12YC
Spark plug gap0.76 mm (0.030 in)
Ignition module air gap0.200-0.300 mm (0.0079-0.0118 in)
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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