The Kohler SV730 is a 725 cc (44.24 cu·in) natural aspirated V-twin four-stroke air-cooled internal combustion gasoline engine with a vertical shaft, from the Courage series, manufactured by Kohler Co for general-purpose applications.
The cylinder bore is 83.0 mm (3.27 in) and the piston stroke is 67.0 mm (2.64 in). The compression ratio rating is 9.0:1.
The Kohler SV730 engine produced 25.3 PS (18.6 KW; 25.0 HP) at 3,600 rpm of maximum output power and 60.7 Nm (6.2 kg·m; 44.8 ft·lb) at 2,200 rpm of peak torque.
The Kohler SV730 features:
- OHV design
- Aluminum head and crankcase with cast-iron cylinder liner
- Fixed Ignition System, Digital Spark Advance Ignition (DSAI), Digital Spark Advance Module (DSAM) ignition system
- Carburetor with fixed main jet (Keihin, Nikki or Walbro)
- Full-pressure lubrication lubrication system with oil filter and bypass valve
- Forced air cooling system
- Electric starter
General information
| Engine Specifications | |
| Engine model | Courage SV730 |
| Engine type | 4-stroke, OHV, V-twin |
| Displacement | 725 cm3, (44.24 cu·in) |
| Max. horsepower | 25.3 PS (18.6 KW; 25.0 HP) at 3,600 rpm |
| Max. torque | 60.7 Nm (6.2 kg·m; 44.8 ft·lb) at 2,200 rpm |
| Cooling system | Forced air |
| Air cleaner | Replaceable, paper element |
| Lubricating system | Pressurized lubrication |
| Ignition system | Fixed Ignition System, Digital Spark Advance Ignition (DSAI), Digital Spark Advance Module (DSAM) |
| Fuel system | Carburetor with fixed main jet (Keihin, Nikki or Walbro) |
| Fuel consumption | – |
| Fuel tank capacity | – |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Starting system | Electric starter |
| Dimensions (L x W X H) | 470 x 452 x 340 mm (18.5 x 17.8 x 13.4 in) |
| Dry weight | 41.3 kg (91.1 lbs) |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 9.0:1 |
| Cylinder bore: | 83.0 mm (3.27 in) |
| Piston stroke: | 67.0 mm (2.64 in) |
| Cylinder internal diameter (standard): | 83.006-83.031 mm (3.2679-3.2689 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Connecting rod small end diameter (standard): | 17.015-17.023 mm (0.6699-0.6702 in) |
| Piston pin diameter: | 16.995-17.000 mm (0.6691-0.6693 in) |
| Crankshaft main journal diameter: | 40.913-40.935 mm (1.6107-1.6116 in) |
| Crankpin journal diameter: | 35.955-35.973 mm (1.4155-1.4163 in) |
| Crankshaft center distance: | 33.5 mm (1.32 in) |
| Cylinder head | |
| Valve arrangement: | OHV |
| Valves: | 2 (4 valves in total) |
| Valve head diameter (INTAKE): | 33.370-33.630 mm (1.3138-1.324 in) |
| Valve head diameter (EXHAUST): | 29.370-29.630 mm (1.1563-1.1665 in) |
| Valve steam diameter (INTAKE): | 6.982-7.000 mm (0.2749-0.2756 in) |
| Valve steam diameter (EXHAUST): | 6.970-6.988 mm (0.2744-0.2751 in) |
Service Data
| Valve clearance | |
| Intake valve clearance: | 0.101-0.152 mm (0.004-0.006 in) |
| Exhaust valve clearance: | 0.101-0.152 mm (0.004-0.006 in) |
| Oil system | |
| Lubrication system: | Pressurized lubrication |
| Oil type: | SJ or higher |
| Recommended oil: | SAE 10W-30 |
| Oil capacity: | 1.6 L (1.69 US. qt, 1.41 Imp. qt.) |
| Ignition system | |
| Type: | Fixed Ignition System, Digital Spark Advance Ignition (DSAI), Digital Spark Advance Module (DSAM) |
| Spark plug: | Champion RC12YC |
| Spark plug gap: | 0.76 mm (0.0299 in) |
| Spark plug torque: | 27 N·m (2.8 kg·m, 19.9 ft·lb) |
Tightening Torque Specs
| Valve clearance | |
| Cylinder Head Flange Nut | 16.9-33.9 Nm (12.5-25 ft-lbs) |
| Cylinder Head Bolt | 22.6-41.8 Nm (16.7-30.8 ft-lbs) |
| Rocker Arm Screw | 11.3 Nm (8.3 ft-lbs) |
| Connecting Rod Cap | 22.7 Nm (16.7 ft-lbs.) |
| Flywheel Retaining Screw | 66.4 Nm (49 ft-lbs) |
| Intake Manifold Mounting | 7.4 Nm (5.5 ft-lbs) |
| Carburetor Mounting Nut | 6.2-7.3 Nm (4.6-5.4 ft-lbs.) |
| Oil Drain Plug | 13.6 Nm (10 ft-lbs.) |
| Oil Pan | 24.4 Nm (18 ft-lbs.) |
| Governor Lever Nut | 6.8 Nm (5 ft-lbs.) |
| Ignition Module | 4.0-6.2 Nm (2.9-4.6 ft-lbs.) |
| Oil Filter | 10.4-12.7 Nm (7.5-9.2 ft-lbs.) |
Applications
| Manufacturer or Brand | Models |
| Lawn tractors | |
| Cub Cadet | SLT1550, SLTX1050, SLTX1054 |
| Husqvarna | LGT2554 |
| Zero-turn mowers | |
| Cub Cadet | RZT 50 KH |
References
1. Kohler Courage SV710-SV740, Kohler Courage PRO SV810-SV840 service manual. Kohler Co. 2020.
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