Rehlko Command Pro CH730-3225 23.5HP Exmark Replacement Engine
The Rehlko Command Pro CH730-3225 is a 23.5 HP, 725cc commercial horizontal-shaft V-Twin engine configured for select Exmark Lazer Z mower applications. Formerly sold under the Kohler Engines brand, this Command PRO engine combines electric start, a heavy-duty air cleaner and an application-specific 1-1/8-inch keyed crankshaft.
The CH730-3225 is an important replacement specification for older Kohler-powered Exmark equipment. It is a documented replacement for CH730-0003 and is also the successor to CH730-3213, which replaced earlier CH730-0155 applications. Because engine specification numbers can differ in crankshaft, charging, controls and installation components, always confirm your original engine specification before ordering.
Payment Notice: Payment for this item is accepted by wire transfer, check or ACH. Credit card payments are subject to a 4% transaction fee. Please contact Carroll Stream Motor Company for additional information.
Replacing an Exmark engine? The CH730-3225 is an Exmark-spec Command PRO engine with a 1-1/8-inch keyed crankshaft. Do not select a replacement based only on horsepower or shaft diameter.
If you are unsure about fitment, call Carroll Stream Motor Company at 1-888-208-2088 with your equipment model, serial number and complete engine model/specification number.
Rehlko CH730-3225 Key Features
- 23.5 HP Command PRO: Commercial-grade horizontal-shaft V-Twin designed for professional equipment.
- 725cc V-Twin: Four-cycle OHV configuration with cast-iron cylinder liners.
- Exmark-Specific Configuration: Designed for select Exmark Lazer Z and compatible replacement applications.
- 1-1/8-Inch Keyed Crankshaft: Approximately 2.79-inch shaft length with a full 1/4-inch keyway.
- 7/16-20 Tapped Shaft End: Drilled and tapped crankshaft for compatible drive installation.
- 12-Volt Electric Start: Heavy-duty electric starting system for equipment integration.
- Regulated Charging System: Designed to support the battery and electrical requirements of the equipment.
- 38.4 ft-lb Peak Torque: Peak torque output at approximately 2,800 RPM.
- Full-Pressure Lubrication: Full-flow oil filtration helps protect internal components under sustained operation.
- Integrated Oil Cooler: Helps control oil temperature during demanding commercial operation.
- Heavy-Duty Air Cleaner: Provides additional filtration for mowing and other dusty operating environments.
- Mechanical Governor: Helps maintain operating speed as engine load changes.
CH730-3225 Specifications
| Rehlko Command Pro CH730-3225 Specifications | |
|---|---|
| Brand | Rehlko |
| Engine Family | Command PRO |
| Model / Specification | CH730-3225 |
| Manufacturer Part Number | PA-CH730-3225 |
| Primary Application | Select Exmark Lazer Z mower applications |
| Engine Type | 4-Cycle OHV V-Twin Gasoline Engine |
| Shaft Orientation | Horizontal |
| Displacement | 725cc / 44.2 cu. in. |
| Gross Power | 23.5 HP @ 3,600 RPM |
| Peak Torque | 38.4 ft-lb @ 2,800 RPM |
| Bore x Stroke | Approximately 3.27 x 2.64 in. (83 x 67 mm) |
| Starting Type | 12-Volt Electric Start |
| Charging System | Regulated Charging System |
| Governor | Mechanical |
| Fuel Type | Unleaded Gasoline |
| Cooling | Forced Air / Air-Cooled |
| Lubrication | Full-Pressure Lubrication With Full-Flow Oil Filter |
| Oil Capacity | Approximately 2.0 US Quarts (1.9 L) |
| Oil Cooler | Yes |
| Air Cleaner | Heavy-Duty Air Cleaner |
| Shaft Type | Keyed Straight Crankshaft |
| Shaft Diameter | 1-1/8 in. |
| Shaft Length | Approximately 2.79 in. |
| Keyway | 1/4 in. |
| Shaft End | 7/16-20 Drilled and Tapped |
| Reduction | None |
| Fuel Tank Included | No |
| Muffler Included | No |
| Manufacturer Warranty | 3-Year Commercial Limited Warranty |
Exmark Lazer Z Replacement Engine
The CH730-3225 is an Exmark-spec Rehlko Command PRO engine. Exact replacement references identify it for Exmark Lazer Z applications, making Exmark fitment more relevant to this specification than generic applications such as generators, log splitters or hydraulic pumps.
One of the key direct replacement numbers is CH730-0003 / PA-CH730-0003. Depending on the age of your mower, the original engine identification may also reference an older Kohler or Exmark specification.
CH730-0003 → CH730-3225
CH730-3213 → CH730-3225
CH730-0155 → CH730-3213 → CH730-3225
Other older Exmark/Kohler numbers have also been associated with this replacement configuration. If your engine plate does not show one of the numbers above, contact Carroll Stream before ordering so the complete equipment and engine configuration can be checked.
CH730-3225 Crankshaft Size
The Rehlko CH730-3225 crankshaft measures 1-1/8 inches in diameter and approximately 2.79 inches in overall shaft length. It uses a 1/4-inch keyway and a 7/16-20 drilled and tapped shaft end.
These dimensions are among the most important specifications to verify when repowering equipment. Another CH730 engine may have the same horsepower and displacement but use a different crankshaft length, diameter, electrical configuration or control setup.
Why the Exact CH730 Specification Number Matters
CH730 identifies the engine family, while 3225 identifies the application-specific configuration. Rehlko and Kohler produced the CH730 in numerous specifications for different equipment manufacturers.
For that reason, replacing an engine based solely on "23.5 HP Kohler," "725cc Command PRO" or "1-1/8-inch shaft" can lead to fitment problems. The crankshaft, charging system, wiring, throttle controls, air cleaner, exhaust configuration and other components may vary between specification numbers.
Rehlko Command PRO Commercial Engine Platform
The CH730 belongs to Rehlko's Command PRO commercial V-Twin engine family. Its air-cooled 725cc design uses full-pressure lubrication with oil filtration, cast-iron cylinder liners, electric starting and a mechanical governor. The CH730 is rated at 23.5 gross horsepower and 38.4 ft-lb of peak torque.
Rehlko is the current name of the engine business formerly known as Kohler Engines. As a result, older equipment, manuals and replacement references may identify this engine as a Kohler Command PRO CH730-3225, while newer inventory carries the Rehlko brand.
Before Ordering the CH730-3225
Locate the identification label on your existing engine and confirm the complete model and specification number before purchasing.
- Confirm the complete engine model and specification number.
- Verify that your application requires the 1-1/8-inch keyed crankshaft.
- Verify the crankshaft length and 1/4-inch keyway.
- Confirm the 7/16-20 drilled and tapped shaft end.
- Confirm electrical and charging-system connections.
- Verify your existing exhaust configuration.
- Confirm equipment model and serial number whenever possible.
Need help confirming whether CH730-3225 fits your Exmark?
Call Carroll Stream Motor Company at 1-888-208-2088. Have your equipment model, serial number and complete engine model/specification number available.
Rehlko Command Pro CH730-3225 FAQs
What is the Rehlko Command Pro CH730-3225?
The Rehlko Command Pro CH730-3225 is a 23.5 HP, 725cc, horizontal-shaft commercial V-Twin gasoline engine configured for select Exmark mower applications.
Is the CH730-3225 an Exmark replacement engine?
Yes. The CH730-3225 is an Exmark-spec Command PRO engine and is commonly associated with Exmark Lazer Z replacement applications.
What does the Rehlko CH730-3225 replace?
CH730-3225 is a documented replacement for CH730-0003. It also supersedes CH730-3213, which was used as the replacement for earlier CH730-0155 applications. Always confirm the complete specification and equipment model before purchasing.
Is Rehlko CH730-3225 the same as Kohler CH730-3225?
Rehlko is the current brand name for the engine business formerly known as Kohler Engines. Older documentation may therefore call this engine the Kohler Command PRO CH730-3225.
How much horsepower does the CH730-3225 have?
The CH730-3225 is rated at 23.5 gross horsepower at 3,600 RPM.
How much torque does the CH730 produce?
The CH730 is rated at approximately 38.4 ft-lb of peak torque at 2,800 RPM.
What is the displacement of the CH730-3225?
The Rehlko CH730-3225 has a displacement of 725cc, or approximately 44.2 cubic inches.
What size crankshaft does the CH730-3225 have?
It uses a 1-1/8-inch diameter keyed crankshaft approximately 2.79 inches long with a 1/4-inch keyway.
What thread size is in the end of the CH730-3225 crankshaft?
The shaft end is drilled and tapped 7/16-20.
Does the CH730-3225 have electric start?
Yes. The CH730-3225 is equipped with a 12-volt electric starting system.
Does the CH730-3225 have an oil cooler?
Yes. The Command PRO CH730 platform uses an integrated oil cooler to help manage oil temperature during demanding operation.
Does the CH730-3225 have a heavy-duty air cleaner?
Yes. This specification uses a heavy-duty air-cleaner system suited to commercial mowing environments.
Does the CH730-3225 include a fuel tank?
No. The engine is designed to connect to the equipment's existing fuel system.
Does the CH730-3225 include a muffler?
Carroll Stream's current CH730-3225 configuration is listed without a muffler. Verify your existing exhaust setup and required components before installation.
Can I replace the CH730-3225 with any other CH730 engine?
No. CH730 specification numbers can use different crankshafts, charging systems, controls and application-specific components. Match the complete engine specification rather than choosing a replacement based only on horsepower and displacement.
How do I confirm that CH730-3225 is the right engine for my mower?
Check the model and specification number on your existing engine, along with the equipment model and serial number. Contact Carroll Stream Motor Company before ordering if those numbers do not clearly match a documented CH730-3225 replacement application.
