Owner’s manual
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What engine does Craftsman riding mower use?
The Craftsman riding mower model 917256591 uses a gas, single-cylinder riding mower engine (the exact make and horsepower vary by the engine spec number on your tractor). For the correct engine identification and tune-up parts, match the engine model/type/code to the tractor’s documentation in the 917256591 owner's manual.
Use the engine ID tag on the engine itself (not the tractor model tag). On most Briggs and Stratton style engines, you will find a Model, Type, and Code stamped on the blower housing or valve cover area.
- Park on a flat surface, set the parking brake, and remove the key
- Lift the hood and locate the engine identification label or stamped numbers
- Write down the full engine Model/Type/Code (or equivalent)
- Use that engine ID to select the correct spark plug, air filter, and oil recommendations
- Cross-check maintenance intervals and procedures in the 917256591 owner's manual
The manual for this Craftsman tractor includes maintenance and service topics that apply regardless of the exact engine brand, such as:
- Engine oil type and oil change guidance
- Air filter and air screen cleaning
- Spark plug inspection/replacement intervals
- Fuel filter checks
- Troubleshooting for starting and running issues
| What you’re looking at | What it identifies | What to use it for |
|---|---|---|
| Tractor model number (917256591) | The mower/tractor platform | Correct chassis, deck, belts, steering, and diagrams |
| Engine model/type/code | The engine build | Correct engine tune-up parts and engine-specific specs |
Ordering by the tractor model alone can get you close, but engine tune-up parts are matched to the engine’s exact model/type/code. Getting that ID first prevents wrong spark plugs, filters, and maintenance specs.
Last updated: January 2026
How much does it cost to replace a riding lawn mower engine?
Replacing the engine on a Craftsman riding lawn tractor like model 917256591 typically costs $260 to $1,800 installed, depending on the engine type, labor rates, and whether related items (belts, pulleys, wiring) also need service. Plan on roughly about 6 labor hours for many riding mower engine swaps.
- Engine cost (new vs. rebuilt, horsepower, crankshaft size and length)
- Labor time (engine removal, transfer of parts, test run)
- Extra parts often replaced at the same time (belts, hardware, fuel components)
- Shop supplies (oil, filter, fuel line clamps, anti-seize)
- Pickup/delivery if the tractor is transported to a service center
| Cost item | Typical range | Notes |
|---|---|---|
| Engine (part only) | $200 to $1,400 | Biggest variable; must match crankshaft specs |
| Labor | $200 to $600 | Often based on ~6 hours for riding mowers |
| Fluids and tune-up items | $25 to $120 | Oil, filter, spark plug, fuel filter |
| “While you’re in there” parts | $20 to $150 | Belts, pulleys, fasteners as needed |
We recommend confirming the engine is truly the problem before committing to replacement.
- Verify the battery and cables are clean and tight
- Check the fuse and wiring connections
- Confirm the attachment clutch is disengaged and the clutch/brake pedal is depressed
- Inspect for a faulty solenoid/starter or ignition switch symptoms
- Review the troubleshooting chart in the 917256591 owner's manual
An engine swap is one of the highest-cost repairs on a riding mower. A quick troubleshooting pass can prevent replacing an engine when the real issue is a weak battery, corroded terminals, or a starter/solenoid problem.
Last updated: January 2026
Is it worth replacing a lawn mower engine?
Replacing the engine on your Craftsman lawn tractor model 917256591 is worth it when the tractor’s deck, steering, and drive system are still solid and the total engine swap cost stays well below the cost of replacing the entire tractor. If multiple major systems are worn out, replacement usually makes more sense.
- The mower deck is straight, not rusted through, and still cuts evenly.
- The transmission/transaxle drives smoothly (no slipping, grinding, or loss of power).
- Steering and front axle components are tight (no severe play).
- You can do basic service safely (spark plug wire disconnected before repairs).
- The engine failure is clearly engine-related (low compression, thrown rod, severe smoking).
- You plan to keep the tractor for several more seasons.
Use this simple comparison to decide where your money goes.
| Option | Typical cost range | Time/skill | Best when |
|---|---|---|---|
| Replace engine | Higher | Moderate to high | Chassis is in great shape and you want long-term use |
| Repair engine (partial) | Medium | High | Failure is limited (carb/fuel/ignition) |
| Replace tractor | Highest | Low | Multiple major systems are worn or unsafe |
Many “bad engine” symptoms are actually starting or maintenance issues. The 917256591 manual points to common no-start causes like a weak battery, blown fuse, dirty fuel filter, stale fuel, faulty spark plug, or safety switch problems. Use the troubleshooting and maintenance sections in the 917256591 owner’s manual to confirm the root cause.
- Check battery condition and cable connections
- Verify the attachment clutch is disengaged and the brake pedal is depressed
- Replace the fuel filter once each season
- Replace spark plugs every season or every 100 hours
- Inspect the muffler for corrosion (fire hazard risk)
An engine swap is only a good investment if the rest of the tractor can safely and reliably use that new power. The manual emphasizes keeping hardware tight, never tampering with safety devices, and never making adjustments with the engine running; those basics protect your investment and help prevent repeat failures.
Last updated: January 2026
