Kohler ZT740 27 HP ZT Engine – OEM for Bad Boy Mowers | 3017
Product Overview
The Kohler ZT740 is a premium, commercial-grade vertical shaft engine designed as the original equipment powerhouse for Bad Boy ZT mowers. Delivering a robust 27 horsepower from its 747cc V-Twin platform, this engine is built to handle the most demanding commercial landscaping and large property mowing tasks with exceptional reliability and torque.
*Kohler ZT740 27 HP engine installed in a Bad Boy Mowers zero-turn mower deck, showing clean installation and wiring.*
This model (3017) features advanced Electronic Fuel Injection (EFI) for instant starts in all weather conditions, superior fuel efficiency, and consistent power delivery regardless of altitude or temperature. Built with a durable cast iron cylinder liner and a high-capacity charging system, the ZT740 is engineered for long-term durability under continuous heavy loads. Its commercial-duty design includes a large cast-iron front PTO shaft, premium air filtration, and an oil cooler to maintain optimal operating temperatures during extended use.
As a direct OEM replacement, this engine ensures perfect compatibility and performance restoration for your Bad Boy Mower, making it the smartest choice for owners who refuse to compromise on quality.
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Technical Specifications
| Specification Category | Detail |
|---|---|
| Manufacturer Model Code | ZT740 (Model 3017) |
| Engine Brand | Kohler |
| Horsepower | 27 HP |
| Displacement | 747 cc |
| Cylinders | 2 (V-Twin Configuration) |
| Shaft Orientation | Vertical |
| Shaft Size | 1-1/8″ Diameter, Keyway (Length specific to Bad Boy application) |
| Fuel System | Electronic Fuel Injection (EFI) |
| Cooling System | Air-Cooled with Oil Cooler |
| Starter Type | Electric Start |
| Ignition System | Electronic (CDI) |
| PTO Type | Commercial, Electric Clutch (Front PTO) |
| Charging System | 25 Amp Alternator |
| Oil Capacity | 2.0 Quarts (1.9 L) |
| Fuel Type | Unleaded 87 Octane or Higher |
Technical diagram of the Kohler ZT740 engine showing dimensions, shaft specs, and component locations for Bad Boy Mowers installation.
What’s Included (Typical Replacement Engine)
| Included | Not Included / Required Separately |
|---|---|
| ✓ Complete Long Block Assembly | ✗ Muffler / Exhaust System |
| ✓ Electronic Fuel Injection Assembly | ✗ PTO Clutch |
| ✓ Electric Starter Motor | ✗ Wiring Harness & Connectors |
| ✓ Intake & Air Cleaner Assembly | �or Mounting Hardware |
| ✓ Oil Cooler & Lines | ✗ Engine Mounting Isolators |
| ✓ Flywheel with Blower Housing | �* Spark Plugs |
🛠️ Recommended Replacement Parts & Accessories
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Air Filter: Kohler OEM Air Filter Kit
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Oil Filter: Kohler 52-050-02-S Oil Filter
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Spark Plugs: Champion RC12YC Spark Plug Set
Comparison Table: ZT740 vs. Alternative Engines
| Feature | Kohler ZT740 (EFI) | Standard Carbureted Engine | Competitive EFI Engine |
|---|---|---|---|
| Fuel System | Electronic Fuel Injection (EFI) | Carburetor | EFI |
| Starting | Instant, All-Weather | Manual Choke Required | Good |
| Fuel Efficiency | Excellent (Up to 25% better) | Standard | Good |
| Altitude Performance | Automatic Compensation | Requires Re-jetting | Automatic Compensation |
| Power Band | Consistent Torque Across RPM Range | Peak Power at Specific RPM | Good |
| Ideal Use | Commercial, Large Properties | Residential, Light Commercial | Commercial |
Frequently Asked Questions (FAQs)
Q1: Is this the exact engine that came in my Bad Boy Mower?
A: Yes, the Kohler ZT740 (Model 3017) is the specific OEM (Original Equipment Manufacturer) engine designed and used by Bad Boy Mowers. It ensures a direct bolt-on replacement with no modifications required for compatibility with the mower’s deck, wiring, and controls.
Q2: What are the benefits of EFI over a carburetor?
A: EFI provides several key advantages:
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Instant Starting: No choking, starts immediately in hot or cold weather.
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Better Fuel Economy: Precisely meters fuel, reducing consumption by up to 25%.
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Consistent Power: Automatically adjusts for altitude and temperature changes.
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No Carb Maintenance: Eliminates issues with stale gas, gummed jets, and float bowls.
Q3: What maintenance does this engine require?
A: For optimal longevity, follow this schedule:
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Oil & Filter Change: Every 50-100 hours (use 10W-30)
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Air Filter Service: Check every 25 hours, replace as needed
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Spark Plug Replacement: Every 200-300 hours
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Valve Lash Adjustment: Every 500 hours or seasonally
🖼️ IMAGE: [kohler-zt740-maintenance-points.jpg]
Alt-text: *Close-up photo of a Kohler ZT740 engine with arrows pointing to the oil filter, air filter, spark plugs, and oil fill cap for maintenance.*
Q4: Can I use this engine to replace a different brand on my mower?
A: While physically possible with adapters, it is not recommended. The ZT740 is engineered specifically for the mounting points, PTO alignment, and electrical system of Bad Boy Mowers. Swapping to a different mower brand would require significant fabrication and electrical work.
Q5: What is the typical lifespan of this engine?
A: With proper maintenance and operation, a commercial-grade Kohler ZT740 can reliably deliver 1,500 to 2,500+ hours of service before potentially requiring major overhaul. Many commercial operators get 5-8 seasons of heavy use.
Internal Link: Maximize your engine’s life with our Commercial Mower Engine Maintenance Checklist.
Pros and Cons
| Pros | Cons |
|---|---|
| OEM Direct Fit: Guaranteed compatibility with Bad Boy Mowers. | Premium Price Point: Higher cost than standard residential engines. |
| EFI Reliability: Instant starts and no carburetor issues. | Complex Electronics: Requires specialized diagnostic tools for EFI troubleshooting. |
| Commercial Power: 27 HP provides ample torque for tough conditions. | Bad Boy Specific: Optimized for one brand, limiting cross-compatibility. |
| Kohler Durability: Commercial-grade components for long life. | Heavy Weight: Not suitable for lighter-duty residential mower frames. |
| Excellent Fuel Economy: EFI system reduces fuel consumption significantly. |
Conclusion & Ideal Use Case
The Kohler ZT740 3017 is the definitive engine solution for Bad Boy Mower owners who demand factory-level performance and reliability. It is engineered to restore your commercial zero-turn mower to its original powerhouse status.
This engine is perfectly suited for:
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Bad Boy ZT Mower Engine Replacement
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Commercial Landscaping Businesses
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Large Estate and Property Maintenance
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Golf Course and Sports Field Maintenance
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Municipal and Government Grounds Crews
If you own a Bad Boy Mower and are facing costly repairs or a seized engine, investing in a genuine Kohler ZT740 replacement is the most reliable and cost-effective long-term solution to get back to work with confidence.
🔗 Official Technical Resource
For detailed service manuals, wiring diagrams, and specific torque specifications, always refer to the Kohler Engines Manuals & Resources portal for the most accurate information.
