The Kawasaki FX730V-S09 23.5 HP commercial engine delivers 726cc V-twin power with a 1-1/8" diameter x 3-15/16" long keyed vertical crankshaft. This shaft configuration is designed for compatible zero-turn mowers, commercial riding mowers and professional turf equipment.
If your existing engine has reached the end of its service life, the FX730V-S09 offers Kawasaki FX Series engine construction, electric starting, heavy-duty air filtration and a pressurized lubrication system in a replacement configuration worth comparing against your original engine.
At Carroll Stream Motor Company, we help equipment owners review engine models, shaft dimensions and installation requirements to support replacement-engine selection.
Why Choose the Kawasaki FX730V-S09?
The FX730V-S09 belongs to Kawasaki's FX Series, developed for commercial mowing and turf-maintenance applications. The engine features a four-stroke, 90-degree V-twin configuration with overhead V-valve technology and 726cc displacement.
Kawasaki rates the FX730V at 23.5 HP at 3,600 RPM, with maximum torque of 39.7 ft-lbs at 2,400 RPM. These manufacturer ratings provide a useful comparison when selecting an engine for existing commercial equipment.
The S09 shaft configuration is particularly important for replacement applications. Its 1-1/8-inch diameter and 3-15/16-inch length differ from the shorter 1-inch S12 shaft and the longer S00 configuration.
Kawasaki FX730V Commercial Engine Features
1-1/8" x 3-15/16" Vertical Shaft Specifications
The defining feature of this FX730V-S09 configuration is its 1-1/8-inch diameter x 3-15/16-inch long keyed vertical shaft.
The shaft transfers engine power to mower drive components such as a PTO clutch or drive pulley. An incorrect shaft length can affect pulley position, belt alignment and the ability to install the original clutch.
Before ordering, compare the complete original engine specification, including the shaft diameter, exposed length, keyway and crankshaft end-thread requirements.
- Shaft orientation: Vertical
- Shaft diameter: 1-1/8 inches (28.575 mm)
- Shaft length: 3-15/16 inches (approximately 100 mm)
- Shaft style: Straight and keyed
- Keyway: 1/4 inch according to the existing S09 listing; verify before installation
- End threads: 7/16"-20 according to the existing S09 listing; verify supplied engine
FX730V-S09 Components and Package Information
The following table includes Kawasaki FX730V engine features and comparable specifications published for the FX730V-S09-S replacement package.
| Component | Details |
|---|---|
| Starting System | Electric shift-type starter on referenced S09-S package |
| Charging System | 15 Amp alternator on referenced S09-S package |
| Fuel Pump | Included with referenced S09-S replacement package |
| Fuel System | Carburetor with fuel shut-off solenoid on electric-start models |
| Air Filter | Multi-stage canister air cleaner |
| Lubrication | Pressurized oil system with oil filter |
| Oil Capacity with Filter | 2.2 U.S. quarts (2.1 L) |
| Fuel Tank | No integrated fuel tank on referenced S09-S package |
| Muffler | Not included in referenced S09-S package; verify actual inventory |
| Crankshaft | 1-1/8" x 3-15/16" vertical keyed shaft |
Kawasaki FX730V-S09 Technical Specifications
| Specification | Value |
|---|---|
| Manufacturer | Kawasaki |
| Model | FX730V-S09 |
| 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 overhead V-valve V-twin |
| Cylinders | 2 |
| Bore x Stroke | 3.1" x 3.0" (78 x 76 mm) |
| Compression Ratio | 8.2:1 |
| Fuel Type | Gasoline |
| Shaft Orientation | Vertical |
| Shaft Diameter | 1-1/8" (28.575 mm) |
| Shaft Length | 3-15/16" (approximately 100 mm) |
| Shaft Style | Straight, keyed |
| Starting System | Electric shift-type on referenced S09-S package |
| Charging System | 15 Amp on referenced S09-S package |
| 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 |
| Manufacturer Dry Weight | 101.4 lbs (46.0 kg) |
| Manufacturer Dimensions | 18.42" x 16.88" x 21.41" |
| Applications | Compatible commercial zero-turn and turf equipment |
Power, torque, displacement, oil capacity and dimensions come from Kawasaki's FX730V manufacturer specifications. S09-specific shaft and package details are supported by the comparable replacement listing. Manufacturer dry weight is different from shipping weight.
Commercial Zero-Turn Mower Replacement Applications
The FX730V engine platform is designed for commercial mower and turf applications requiring compatible vertical-shaft V-twin power.
Owners of Kawasaki-powered commercial mowers should identify the original engine specification before choosing a replacement. Different mower models and production years may use different shaft lengths, wiring and exhaust components.
Carroll Stream Motor Company recommends using the full engine model and mower information to evaluate fitment, rather than relying on mower brand or horsepower alone.
FX730V-S09 Replacement Engine Cross-References
Several related S09 model suffixes appear in third-party replacement-engine catalogs. These references may help when researching a replacement for an existing Kawasaki FX730V.
Original Listing References
Additional S09-S Catalog References
These model identifiers are provided to support replacement research. Suffixes may represent differences in electrical components, controls, accessories or installation requirements.
Compare Kawasaki FX730V Shaft Options
Carroll Stream offers other FX730V specifications for customers who need different output shaft dimensions. The following comparisons are useful for narrowing down replacement options.
| Model | Listed Shaft Dimensions |
|---|---|
| FX730V-S09 | 1-1/8" diameter x 3-15/16" length |
| FX730V-S12 | 1" diameter x 3-5/32" length |
| FX730V-S00 | 1-1/8" diameter x 4-9/32" length |
These shafts are not interchangeable solely because the engines share a 23.5 HP rating. Check the required PTO position and equipment mounting configuration.
How to Verify FX730V-S09 Engine Fitment
Before placing an order, review these important installation requirements.
- Find the original engine model. Record the complete Kawasaki model and specification number on the engine label.
- Measure the crankshaft. Confirm the diameter, length, keyway and end-thread specifications.
- Check mounting dimensions. Verify the bolt pattern, engine footprint and available mower clearance.
- Confirm electrical connections. Review the starter, charging system, wiring and safety connections.
- Check throttle and fuel controls. Verify fuel pump connections, carburetor controls and equipment-specific linkages.
- Review exhaust requirements. Determine whether a compatible muffler or additional exhaust components are needed.
Contact Carroll Stream Motor Company with your mower make, model, serial number and original engine specification.
Call 1-888-208-2088 for assistance reviewing replacement-engine requirements.
Kawasaki FX730V Maintenance and Service Parts
Keeping the engine properly maintained is important for commercial mowing applications.
Kawasaki's FX730V platform features a pressurized lubrication system, replaceable oil filter and multi-stage canister air cleaner.
Explore Related Kawasaki Engines at Carroll Stream
If the FX730V-S09 does not match your original shaft requirements, review these other Kawasaki engine configurations.
Kawasaki FX730V-S09 Frequently Asked Questions
How much horsepower does the FX730V-S09 have?
Kawasaki rates the FX730V at 23.5 HP at 3,600 RPM. The engine has 726cc displacement and maximum torque of 39.7 ft-lbs at 2,400 RPM.
What size crankshaft is on the FX730V-S09?
The S09 configuration is listed with a 1-1/8-inch diameter x 3-15/16-inch long keyed vertical shaft.
Is the FX730V-S09 electric start?
The comparable FX730V-S09-S replacement package includes an electric starter. Verify the exact engine configuration being supplied.
Does the FX730V-S09 use a 15-amp alternator?
The referenced S09-S package includes a 15-amp alternator. Check electrical compatibility with your original mower.
Does the FX730V-S09 have a fuel pump?
A fuel pump is listed with the comparable S09-S replacement engine package. Confirm the exact fuel configuration.
Does the FX730V-S09 include a muffler?
The referenced S09-S replacement package is listed without a muffler. Confirm what is included before purchasing.
Can the FX730V-S09 replace an FX730V-S00?
Not automatically. The listed shaft lengths are different. Verify crankshaft dimensions, mounting, electrical connections and equipment requirements.
What is the difference between the S09 and S12?
The FX730V-S09 uses a 1-1/8" diameter x 3-15/16" shaft, while the FX730V-S12 is listed with a 1" diameter x 3-5/32" shaft. These differences can affect PTO compatibility.
What is the FX730V oil capacity?
Kawasaki specifies 2.2 U.S. quarts, approximately 2.1 liters, with the oil filter.
How much does the Kawasaki FX730V weigh?
Kawasaki lists the FX730V manufacturer dry weight at 101.4 lbs (46 kg). Packaged shipping weight may be higher.
Can Carroll Stream help with replacement selection?
For assistance reviewing engine model information and compatibility requirements, contact Carroll Stream Motor Company at 1-888-208-2088. Have your existing engine and equipment details ready.
Official Kawasaki FX730V Specifications and Manuals
For additional technical information and available operator documentation, review Kawasaki's official engine resources.
Shop the Kawasaki FX730V-S09 at Carroll Stream
The Kawasaki FX730V-S09 combines 23.5 HP, 726cc V-twin power and a 1-1/8" x 3-15/16" keyed vertical shaft for compatible commercial equipment.
Review your original engine specifications and check the product's current availability, shipping and purchase information before ordering.
Questions About Engine Compatibility? Call Carroll Stream Motor Company at 1-888-208-2088 .
Cross-reference information does not establish direct interchangeability. Exact engine configuration and package contents may vary by specification suffix. Confirm your equipment's requirements before purchase.
