The Kawasaki FX730V-S12 23.5 HP commercial engine combines a 726cc V-twin design with a compact 1-inch diameter x 3-5/32-inch long vertical crankshaft. Built for compatible commercial zero-turn mowers and professional turf equipment, this FX Series engine delivers Kawasaki power in a specific short-shaft replacement configuration.
Whether replacing a damaged engine or researching a commercial mower repower, the FX730V-S12 provides electric starting, heavy-duty canister air filtration, cast-iron cylinder liners and pressurized lubrication.
Carroll Stream Motor Company offers Kawasaki replacement engines for customers who need to compare shaft sizes, engine specifications and equipment requirements before purchasing.
Why Choose the Kawasaki FX730V-S12?
The Kawasaki FX730V-S12 is a configuration of Kawasaki's FX730V commercial engine family. It uses a four-stroke, 90-degree V-twin design with overhead valves and 726cc displacement.
The FX730V produces 23.5 horsepower at 3,600 RPM and maximum torque of 39.7 ft-lbs at 2,400 RPM. These performance ratings help equipment owners compare the FX730V with other commercial engine options.
The S12 configuration is particularly relevant when a mower requires a shorter 1-inch diameter crankshaft. Selecting the correct shaft is essential for the position of the drive pulley or electric PTO clutch.
Kawasaki FX730V-S12 Engine Features
1" x 3-5/32" Vertical Shaft Configuration
The Kawasaki FX730V-S12 has a listed 1-inch diameter x 3-5/32-inch long vertical output shaft. This differs from other FX730V specifications that use larger or longer crankshafts.
For mower replacement, the correct shaft diameter and length help determine whether the existing electric PTO clutch, pulley and drive components can be installed properly.
- Shaft diameter: 1 inch (25.4 mm)
- Shaft length: 3-5/32 inches (approximately 80.2 mm)
- Orientation: Vertical
- Shaft type: Straight, keyed
- Keyway: 1/4 inch according to the existing S12 listing; verify on supplied engine
- End thread: 7/16"-20 according to the existing listing; verify before installation
Engine Components and Package Details
The following table combines Kawasaki FX730V engine features with package specifications published for the comparable FX730V-S12-S replacement engine.
| Component | Details |
|---|---|
| Starting System | Heavy-duty electric shift-type starter |
| Alternator | 15 Amp on referenced FX730V-S12-S package |
| Fuel Delivery | Carburetor with fuel shut-off solenoid |
| Fuel Pump | Included on referenced FX730V-S12-S package |
| Air Cleaner | Multi-stage canister air filter |
| Oil System | Pressurized with oil filter |
| Oil Capacity with Filter | 2.2 U.S. qt (2.1 liters) |
| Fuel Tank | No integrated fuel tank on referenced S12-S package |
| Muffler | Not included on referenced S12-S package; verify actual inventory |
| Crankshaft | 1" diameter x 3-5/32" length, keyed vertical shaft |
Kawasaki FX730V-S12 Technical Specifications
| Specification | Value |
|---|---|
| Manufacturer | Kawasaki |
| Model | FX730V-S12 |
| Engine Series | FX Series |
| Maximum Power | 23.5 HP at 3,600 RPM |
| Maximum Torque | 39.7 ft-lbs at 2,400 RPM |
| Displacement | 726cc (44.3 cu. in.) |
| Engine Type | Four-stroke, 90-degree OHV V-twin gasoline |
| Number of Cylinders | 2 |
| Bore x Stroke | 3.1" x 3.0" (78 x 76 mm) |
| Compression Ratio | 8.2:1 |
| Crankshaft Orientation | Vertical |
| Shaft Diameter | 1" (25.4 mm) |
| Shaft Length | 3-5/32" (approximately 80.2 mm) |
| Shaft Type | Straight, keyed |
| Starting System | Electric shift-type |
| Charging | 15 Amp on referenced S12-S package |
| Fuel Type | Gasoline |
| Ignition | Electronic spark ignition |
| Cooling | Forced-air cooled |
| Oil System | Pressurized with oil filter |
| Oil Capacity with Filter | 2.2 U.S. qt (2.1 L) |
| Air Cleaner | Multi-stage canister air filter |
| Dry Engine Weight | 101.4 lbs (46.0 kg), manufacturer reference |
| Manufacturer Dimensions | 18.42" x 16.88" x 21.41" |
| Applications | Compatible commercial zero-turn and turf maintenance equipment |
Manufacturer power, displacement, oil capacity, dry weight and engine dimensions are based on Kawasaki FX730V specifications. The shaft and package information relate to the referenced S12 configuration. Shipping weight may differ from dry engine weight.
Commercial Mower Replacement Applications
The Kawasaki FX730V engine family is designed for commercial mowing applications requiring dependable power from a vertical-shaft engine.
The FX730V-S12 configuration may be suitable for select zero-turn mowers and professional turf equipment requiring a 1-inch diameter, approximately 80 mm long output shaft.
Kawasaki engines can be found in equipment from several commercial mower manufacturers, but compatibility depends on the individual mower, engine specification and installed components.
Carroll Stream recommends confirming the mower model, serial number and original engine identification before selecting a replacement.
FX730V-S12 Replacement Model References
The Kawasaki FX730V-S12 is researched alongside other FX730V specification numbers in replacement-engine catalogs. These identifiers can help when comparing an original engine with a proposed replacement.
FX730V S12 Family
Other FX730V Reference Models
How to Confirm the Correct FX730V Replacement
Before ordering, review the following engine and equipment specifications.
- Locate your engine model. Record the complete Kawasaki model and specification number from the engine label.
- Measure the crankshaft. Confirm the 1-inch diameter, 3-5/32-inch length, keyway and end-thread dimensions.
- Check the mounting layout. Compare mounting bolt locations, engine clearance and PTO clutch positioning.
- Verify electrical components. Check starter compatibility, charging output and wiring connections.
- Review fuel connections. Confirm fuel delivery, fuel pump, throttle and choke configurations.
- Confirm exhaust requirements. Determine whether the existing muffler can be transferred or another compatible exhaust assembly is required.
Have your mower make, model, serial number and original Kawasaki engine specification ready when contacting Carroll Stream Motor Company.
Call 1-888-208-2088 for assistance reviewing replacement-engine requirements.
Compare Kawasaki FX730V Shaft Configurations
Not every FX730V engine has the same output shaft. Different specification numbers may use different diameters, lengths and accessory configurations.
| Engine | Listed Shaft |
|---|---|
| FX730V-S12 | 1" diameter x 3-5/32" length |
| FX730V-S09 | 1-1/8" diameter x 3-15/16" length |
| FX730V-S00 | 1-1/8" diameter x 4-9/32" length |
These shaft differences can affect pulley position, PTO clutch fitment and equipment compatibility. Always match the complete engine specification.
Kawasaki FX730V Maintenance and Engine Parts
Regular maintenance is important for protecting engine performance and long-term operation. The FX730V uses pressurized lubrication and a multi-stage canister air filtration system.
Kawasaki FX730V Engine Video
View the available FX730V engine video for additional product information. Confirm that the video matches the particular engine specification being purchased.
Compare Other Kawasaki Engines at Carroll Stream
Kawasaki FX730V-S12 Frequently Asked Questions
How much horsepower does the FX730V-S12 produce?
The Kawasaki FX730V engine is rated at 23.5 HP at 3,600 RPM and produces maximum torque of 39.7 ft-lbs at 2,400 RPM.
What shaft size does the FX730V-S12 have?
The FX730V-S12 configuration is listed with a keyed vertical shaft measuring 1 inch in diameter and 3-5/32 inches in length.
Does the FX730V-S12 have electric start?
The comparable FX730V-S12-S replacement package includes electric start and a heavy-duty shift-type starter.
Does it include a 15-amp alternator?
The referenced FX730V-S12-S replacement package lists a 15-amp alternator. Confirm the charging configuration of the engine being supplied.
Does the FX730V-S12 have a fuel pump?
A fuel pump is listed with the comparable S12-S package. Confirm the exact fuel-system configuration before purchasing.
Does the FX730V-S12 include a muffler?
The referenced S12-S package is listed without a muffler. Confirm package contents and whether a compatible exhaust assembly is required.
Can the FX730V-S12 replace an FX730V-S00?
Not automatically. The FX730V-S12 uses a different crankshaft configuration than the listed FX730V-S00. Confirm all mounting, drive and electrical requirements before substitution.
What is the oil capacity of the FX730V?
Kawasaki specifies 2.2 U.S. quarts (2.1 liters) with the oil filter.
Is the FX730V-S12 suitable for zero-turn mowers?
It may be suitable for compatible commercial zero-turn mower applications. Fitment depends on the exact mower model and original engine specification.
What is the manufacturer dry weight?
Kawasaki lists the FX730V dry engine weight as 101.4 lbs (46.0 kg). Shipping weight may differ.
Can Carroll Stream help identify the correct engine?
For assistance reviewing engine specifications, contact Carroll Stream Motor Company at 1-888-236-6690. Have your mower model and existing engine identification available.
Official Kawasaki FX730V Specifications and Manuals
Review Kawasaki's manufacturer resources for technical details, maintenance information and operator documentation.
Order the Kawasaki FX730V-S12 from Carroll Stream
The Kawasaki FX730V-S12 combines 23.5 HP, 726cc V-twin power and a 1" x 3-5/32" keyed vertical shaft for compatible commercial mower applications.
Review the specifications, confirm your equipment's requirements and check current availability and shipping options before ordering.
Questions About Compatibility? Call Carroll Stream Motor Company at 1-888-208-2088 for help reviewing the information needed to select a replacement engine.
Cross-reference information does not guarantee direct fitment. Engine specifications, included components and package contents can vary by suffix and supplier. Always confirm compatibility before purchase.
