Owner’s manual
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What engine does Craftsman riding mower use?
The Craftsman lawn tractor model 917255970 uses an 18.0 HP twin-cylinder engine; the owner’s manual lists the engine model as 422707 (with a separate type number). For the exact engine identification on your tractor, match the numbers on the engine blower housing.
How to confirm the exact engine on your 917255970
Use these quick checks so you order the right tune-up and fuel-system parts:
- Look under the seat for the tractor model plate; it should show 917255970.
- Find the engine model label on the blower housing (the manual notes this is where the engine model number is located).
- Record engine model, type, and code (if present); small differences change parts like air filters and carburetor kits.
- Compare what you wrote down to the engine information listed in the 917255970 owner’s manual.
Engine details (from the manual)
| Item | What to look for | Why it matters |
|---|---|---|
| Tractor model | 917255970 | Ensures you are in the correct parts breakdown |
| Engine horsepower | 18.0 HP | Helps match the correct engine family |
| Cylinder count | Twin-cylinder | Affects tune-up parts and starting behavior |
| Engine model number | 422707 | Primary identifier for engine-specific parts |
Why it matters
Craftsman tractors often share similar frames and mower decks across model families, but the engine model number drives the correct selection of ignition parts, fuel parts, and maintenance items. Confirming the engine ID first prevents wrong-part returns and no-start issues after service.
Last updated: January 2026
Who makes Craftsman push mower engines?
For Craftsman model 917255970, the engine shown in the parts listing is a Briggs & Stratton twin-cylinder engine (engine model 422707, type 1243-01). Craftsman push mower engines vary by model and year, but Briggs & Stratton is one of the most common suppliers.
What we know for model 917255970
The 917255970 owner's manual identifies the engine as:
- Briggs & Stratton engine model 422707
- Type number 1243-01
- Engine model number location: on the blower housing
- Tractor model number location: on the model plate under the seat
Common engine makers used on Craftsman mowers
Across Craftsman lawn equipment, you will commonly see engines from:
- Briggs & Stratton
- Kohler
- Kawasaki
Because Craftsman uses multiple engine suppliers, the most accurate way to confirm your engine maker is to match the engine model and type number on the engine itself to what is listed in your documentation.
Quick ID checklist (fastest way to confirm)
Use this checklist before ordering tune-up or starting parts:
- Find the engine model and type stamped/printed on the engine
- Match it to the engine information in the 917255970 owner's manual
- Use the engine model and type when searching for engine-specific parts (carburetor kits, starter drive, gaskets)
- Use the tractor model number 917255970 when searching for chassis and deck parts (belts, pulleys, steering)
Tractor model vs engine model (why there are two numbers)
| What you’re identifying | Example for this unit | Used for |
|---|---|---|
| Tractor model number | 917255970 | Mower deck, transaxle, steering, belts, electrical |
| Engine model and type | 422707 / 1243-01 | Engine internals, carburetor, starter, ignition |
Why it matters
Engine manufacturer and model determine the correct maintenance and repair parts. Ordering by “Craftsman mower engine” alone often leads to mismatches, especially for ignition, carburetor, and starter components.
Last updated: January 2026
Is it worth replacing a lawn mower engine?
Yes, replacing the engine on your Craftsman lawn tractor model 917255970 is worth it when the tractor chassis, mower deck, steering, and transmission are in solid shape and the total engine swap cost stays well below the cost of a comparable replacement tractor. Use the 917255970 owner's manual to confirm safe service steps before any repair.
Quick decision checklist
- The mower deck is not rusted through and the mandrels spin smoothly
- The transmission/transaxle drives normally (no slipping or loud grinding)
- Steering and front axle components are tight (no severe play)
- You can do basic service safely (battery disconnect, spark plug wire off)
- The engine replacement plus labor is under about 50% of the price of a similar new tractor
- You plan to keep the tractor for several more seasons
Cost and effort: replace engine vs replace tractor
| Option | Best when | Typical downside |
|---|---|---|
| Replace engine (complete) | Deck and drivetrain are strong; you want maximum reliability | Higher parts cost; more install time |
| Replace short block (if available) | You want a middle-ground rebuild | Still requires teardown and careful setup |
| Buy a new tractor | Multiple systems are worn (deck, steering, transaxle) | Higher upfront cost; new setup and accessories |
What to check on model 917255970 before spending money
- Safety and starting system: The manual stresses disconnecting the spark plug wire and avoiding adjustments with the engine running.
- Belt-driven systems: If you already have drive issues, inspect belts and pulleys first. A worn belt or pulley can mimic engine weakness.
- Common wear items include the lawn tractor drive v-belt 532144200 and the lawn tractor idler pulley 532139245.
- Deck condition: Heavy grass buildup and worn blades can overload an engine; clean the underside and keep blade bolts tight.
Why it matters
An engine swap only pays off when the rest of the tractor is a good “platform.” If the deck, belts, and drivetrain are healthy, a new engine restores power and reliability without replacing the whole machine.
Last updated: January 2026
How much does it cost to replace a riding lawn mower engine?
For a Craftsman lawn tractor model 917255970, a full engine replacement typically runs $260 to $1,800 installed, depending on the engine type, labor rates, and whether related items (battery cables, belts, fuel lines) also need service. Plan on roughly about 6 labor hours for a riding tractor engine swap.
What drives the total price
- Engine cost: the biggest variable (new, remanufactured, or used)
- Labor rate: shop rates vary widely by region
- Extra parts: fuel line, clamps, filters, spark plug, oil, and hardware often get replaced during the job
- Condition issues: seized fasteners, damaged wiring, or worn pulleys can add time
- Pickup and delivery: some shops charge transport fees for riding tractors
Typical cost breakdown (what you are paying for)
| Cost item | Typical range | Notes |
|---|---|---|
| Replacement engine | $150 to $1,400 | Varies by horsepower, crankshaft specs, and brand compatibility |
| Labor (engine swap) | $110 to $600 | Often based on ~6 hours for a riding tractor |
| Fluids and tune-up items | $20 to $150 | Oil, filter, spark plug, fuel filter, clamps |
| Total installed | $260 to $1,800 | Most common all-in range |
Before you replace the engine (quick checks)
If the tractor will not start or cranks poorly, we recommend ruling out common non-engine causes first:
- Verify battery condition and cable connections (the manual covers battery charging and terminal care)
- Check the fuse and basic wiring connections
- Confirm the throttle control is set correctly for starting
- Inspect belts and pulleys if the tractor moves or mows poorly (belt removal and replacement procedures are listed)
For model-specific procedures and safety steps, use the 917255970 owner’s manual.
Why it matters
An engine replacement is one of the highest-cost repairs on a riding mower. Spending a few minutes on battery, fuse, and starting-system checks can prevent replacing an engine when the real issue is electrical, fuel delivery, or a safety interlock problem.
Last updated: January 2026
