Owner’s manual
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How much does it cost to replace a riding lawn mower engine?
Replacing the engine on a Craftsman lawn tractor model 917258510 typically costs about $260 to $1,800 installed, depending on the engine price, whether any pulleys or belts are replaced at the same time, and local labor rates. Plan on around 6 labor hours for a full riding mower engine swap.
These are the biggest factors that change the final cost:
- Engine cost and availability (new, remanufactured, or used)
- Labor time (engine removal, transfer of parts, setup, test run)
- Extra parts you may replace “while you’re in there” (belts, pulleys, hardware)
- Fuel system cleanup if old fuel caused the failure (filter, lines, carburetor service)
- Electrical starting issues that get discovered during diagnosis (battery, cables, solenoid)
| Cost item | Typical range | Notes |
|---|---|---|
| Engine (part only) | $200 to $1,400 | Varies by horsepower, crankshaft specs, and brand compatibility |
| Labor | $200 to $600 | Often 4 to 8 hours depending on shop and condition |
| Misc. parts and supplies | $20 to $200 | Belts, blades, filters, hardware, oil, fuel line |
If the old engine failed catastrophically or the tractor has high hours, these parts often get inspected closely:
- Blade drive belt (deck belt) for glazing or cracking
- Ground drive belt for stretching or slipping
- Engine pulley for wobble or worn grooves
- Mower blades for damage or imbalance
For this model, examples of related parts we commonly see replaced include the lawn tractor drive belt 532144200 and the engine pulley 532140186.
An engine replacement is one of the highest-cost repairs on a riding mower. Confirming the correct engine crankshaft size, PTO setup, and belt routing up front prevents repeat labor and helps the tractor cut and drive correctly after installation.
We recommend checking these basics first, because a “bad engine” symptom is sometimes a starting or safety issue:
- Battery condition and cable connections
- Safety interlock switches (seat, brake, PTO)
- Starter solenoid and starter operation
- Fuel quality and fuel flow
If the engine clicks but won’t turn, use riding lawn mower engine clicks but doesnt turn over video. If it spins but won’t start, use riding lawn mower engine spins but wont start video. For model-specific specs and service procedures, use the 917258510 owner's manual.
Last updated: January 2026
Is it worth replacing a lawn mower engine?
Yes, replacing the engine on your Craftsman lawn tractor model 917258510 is worth it when the chassis, steering, and 42-inch deck are solid and the total swap cost stays well below the price of a comparable replacement tractor.
Replace the engine when most of these are true:
- The deck is structurally sound (no cracks, rust-through, or bent hangers)
- The tractor still drives and stops correctly (brake works and can be adjusted)
- The transaxle shifts and pulls without slipping
- You can keep safety interlocks and guards working as designed
- The engine swap cost is clearly less than buying a similar riding mower
For safety steps and service procedures, use the 917258510 owner's manual.
If the engine runs but cut quality is poor, fix the deck drive system first. A worn belt or pulley can reduce blade speed and cause uneven cutting.
Common wear items on this tractor include:
- Drive belt and deck belt condition (cracks, glazing, stretching)
- Idler pulley bearing noise or wobble
- Mandrel play or grinding
If you already know the deck belt is worn, the lawn tractor drive belt 532144200 is a common replacement.
| Option | Best when | Main tradeoff |
|---|---|---|
| Replace engine | Tractor is otherwise dependable | More labor and setup time |
| Repair deck/drive | Engine runs well but mowing is weak | Requires troubleshooting |
| Replace tractor | Multiple major systems are worn | Higher upfront cost |
An engine swap is a major investment. Confirming the deck, belts, and safety systems are in good condition helps ensure the tractor will mow correctly and operate safely after the repair.
Last updated: January 2026
What engine does Craftsman riding mower use?
The Craftsman lawn tractor model 917258510 uses a single-cylinder gasoline engine; the exact engine brand and horsepower are listed on the tractor’s engine ID label and in the 917258510 owner's manual.
We recommend confirming the engine by reading the engine’s model-type-code (or model-spec) label. On most front-engine riding mowers, it’s on the blower housing, valve cover area, or near the starter.
- Lift the hood and locate the engine ID label or stamped tag
- Write down the full engine model and code numbers
- Match those numbers to the engine section in the manual
- Use the engine model to buy the correct tune-up parts (spark plug, air filter, fuel filter)
- If the label is missing, use the tractor model number 917258510 to cross-reference parts diagrams
From the documentation for this Craftsman tractor, we can confirm these engine service specs:
| Item | Spec |
|---|---|
| Spark plug | CHAMPION RJ19LM |
| Spark plug gap | 0.030 in |
| Valve clearance (intake) | 0.005 to 0.007 in |
| Valve clearance (exhaust) | 0.009 to 0.011 in |
The engine make and model determine the correct maintenance parts and settings. Even within the same Craftsman tractor series, engines can vary by production run, and using the wrong spark plug or gap can cause hard starting, misfiring, or poor power.
If the engine clicks, spins, or will not start, use these step-by-step guides:
- Riding lawn mower engine clicks but doesnt turn over video
- Riding lawn mower engine spins but wont start video
- Riding lawn mower engine wont turn over or click video
Last updated: January 2026
