Kawasaki FR691V-S06 23.0HP 726cc Engine – 1in Shaft
Built simple, Kawasaki FR691V-S06 packs 23.0 horsepower. A 726cc block backs up the output, and torque peaks at 53.7 Nm. The 1in shaft fits standard mounts. It's built for large residential riding mowers.
- Delivers 23.0 horsepower on demand
- The 726cc block handles the load
- Torque tops out at 53.7 Nm
- A 1in horizontal shaft, standard mount
- Comes with 3 years of warranty coverage
Description
Displacing 726cc across two cylinders, the Kawasaki FR691V-S06 vertical engine sustains constant rotational torque under heavy commercial turf resistance. Commercial lawn tractors and zero-turn mowers face severe deck drag when clearing overgrown grass, causing lesser engines to overheat and lose RPM. This 23.0HP commercial engine features an overhead valve V-twin layout, an electric starter, and a standard 1-inch vertical drive shaft that matches existing commercial clutches.
A precision-machined 1-inch vertical output shaft couples straight to commercial electric clutches and ground-drive belt pulleys without custom adapter shims. Full-pressure lubrication circulates filtered motor oil directly to high-load rod bearings, ensuring uninterrupted fluid barrier protection during continuous full-throttle mowing. The dual-barrel carburetor meters fuel with precision across varying load demands, preventing engine hesitation when mower decks encounter thick, wet turf patches.
Technical Specifications of Kawasaki FR691V-S06
- 726cc 23.0HP Commercial OHV V-Twin: Produces 23.0 rated horsepower to drive wide commercial cutting decks without engine bog.
- 1-Inch Straight Keyed Shaft: Standard commercial diameter matches electric blade clutches and transmission drive pulleys.
- Full-Pressure Lubrication with Spin-On Filter: Keeps rod journals and camshaft lobes coated in pressurized motor oil.
- Durable Cast-Iron Cylinder Sleeves: Resists bore wear from abrasive dirt, extending engine life in severe commercial service.
- 12-Volt Key-Start Electric Motor: Spins the engine flywheel with key activation to eliminate manual starting effort.
Jobsite Performance & Wear Resistance
Designed for professional commercial mowing contractors, this vertical engine delivers reliable shaft power with low fuel consumption.
- A rigid aluminum crankcase casting and precision-machined shaft journals resist side-load belt stress under high tension.
- Overhead valve efficiency delivers clean fuel combustion to reduce carbon accumulation on valve faces.
- Commercial lawn care contractors and estate groundskeepers gain dependable power for high-hour machinery.
- Standard base bolt dimensions allow fast drop-in repower swaps without deck drilling or fabrication delays.
Target Machinery & Drop-In Fitment
Weighing 85 pounds dry with an industry-standard vertical mounting base and 1-inch shaft, this motor repowers 52-inch and 60-inch commercial zero-turn mowers, stand-on turf cutters, and lawn tractors without frame modifications.
Commercial Warranty & Preventive Maintenance
- Commercial purchasers receive 3-Year limited factory warranty coverage for industrial use.
- Consumer buyers receive 3-Year comprehensive manufacturer warranty protection.
Drain engine oil after the initial 20 operating hours, then service every 100 hours with SAE 30 or 10W-30 oil and a new filter. Inspect the air filter weekly on dry cutting routes, and maintain spark plug gaps at 0.030 inches. Order the Kawasaki FR691V-S06 vertical shaft engine from Mulmotor.com for guaranteed factory-fresh units, complete manufacturer warranty coverage, and dedicated commercial equipment support.
Kawasaki FR691V-S06 V-Twin Specs
| Brand | Kawasaki Residential |
| Engine Family | FR Series |
| Displacement | 726 cc |
| Maximum Output | 17.2 kW (23.0 HP) @ 3600 RPM |
| Maximum Torque | 53.7 Nm (39.6 lbs-ft) @ 2200 RPM |
| Air Filtration | Standard Paper Filter |
| Shaft Specification | 1" x 80 mm Vertical Shaft |
| Oil Capacity | 2.1 Liters (w/ Filter) |
| Dry Weight | 40.0 kg |
| Standard Warranty | 3 Years Residential |
| Primary Application | Large Residential Riding Mowers |












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