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What engine is in a Craftsman 917258570?
The Craftsman lawn tractor model 917258570 was commonly sold with a Briggs & Stratton V-twin engine in the 24 HP class (often referenced on YT4000-style tractors). For an exact match, confirm the engine’s model and type numbers on the engine label.
How to identify the exact engine on your tractor
Use the engine’s ID tag, not the tractor model number. On most Briggs & Stratton riding mower engines, the label is on the blower housing, valve cover area, or near the starter.
- Look for Model / Type / Code numbers on the engine label
- Write the numbers down exactly (including dashes)
- Use the Code to determine the engine’s build date
- Match parts by the engine model, not just “24 HP”
- If the label is missing, check for stamped numbers on the shroud or valve cover
Why the engine ID matters (parts and troubleshooting)
Two Craftsman tractors with the same 917-prefix model can use different engines across production runs. The engine model/type determines the correct carburetor, fuel pump, air filter, starter, and ignition parts.
If you are diagnosing hard starting or choke-only running, these deck and drive components are separate systems, but they are common maintenance items to check while you service the tractor:
- Lawn tractor ground drive belt, 1/2 x 82-in 532140294
- Lawn tractor drive belt 532144200
- Husqvarna lawn tractor mulching blade, 21-in 532134149
Quick symptom-to-system guide
| Symptom | Most likely system | What to check first |
|---|---|---|
| Cranks but will not start | Fuel or ignition | Fresh fuel, spark, air filter |
| Starts only on choke | Fuel delivery | Carburetor, fuel pump, fuel line |
| Clicks but will not crank | Starting circuit | Battery, solenoid, cables |
| Uneven cut | Deck setup | Blade condition, deck level |
Helpful DIY guidance
For starting and no-start symptoms on riding mowers, we use these step-by-step resources:
- Riding lawn mower engine spins but wont start video
- Riding lawn mower engine clicks but doesnt turn over video
Why it matters
Knowing the exact engine model prevents wrong-part returns and speeds up repairs, especially for fuel-system and ignition issues where small design differences change the correct replacement part.
Last updated: February 2026
What model number is the Craftsman 42 riding mower?
For the Craftsman front-engine lawn tractor on this page, the model number is 917258570. If you are asking about a different Craftsman 42-inch riding mower, the model number can be different, so we recommend confirming it from the mower’s ID label before ordering parts.
Where to find the model number on a Craftsman riding mower
Most Craftsman riding mowers list the model number on a product ID label. Common places to check include:
- Under the seat (seat pan area)
- On the frame near the engine
- On the rear fender or rear frame rail
- Near the footrest area on the left or right side
- On the mower deck housing (less common)
Model number vs. deck size (why “42-inch” is not enough)
A 42-inch deck is a common configuration across many Craftsman tractors, so deck size alone does not identify the correct parts list.
| What you have | What it tells us | What it does not tell us |
|---|---|---|
| 42-inch cutting deck | Deck width category | Exact belt length, blade style, mandrel type |
| Model number (example: 917258570) | Exact parts breakdown for your tractor | Nothing; it is the identifier we need |
| Part ID/part number | Exact replacement part | Whether it fits other models |
Why it matters for parts and repairs
Using the correct model number helps match the right blade drive belt, ground drive belt, blades, mandrel parts, and steering components for your Craftsman tractor.
If you are servicing the 42-inch deck on model 917258570, a common deck-related replacement is the husqvarna lawn tractor mulching blade, 21-in 532134149 (verify quantity and deck configuration before ordering).
For general mower identification and maintenance tips, we also use the riding mower and tractor common questions guide to help customers avoid ordering the wrong parts.
Last updated: February 2026
What year did Craftsman make the 917258570?
Craftsman model 917258570 was sold across multiple seasons; the model number identifies the tractor platform, but the serial number on the tractor ID label pins down the exact build year. For many Craftsman 917 tractors, the manufacturing source is Husqvarna/AYP, so the serial is the reliable way to date it.
How to find the exact build year
Use the tractor’s product identification label (not the engine tag) to determine the year.
- Look under the seat for the model/serial label
- If it’s not there, check the rear fender pan area near the seat mount
- Write down the serial number exactly as printed
- Clean the label gently so you do not remove characters
- Use that serial when ordering parts to match running changes
Model number vs. serial number (what each tells you)
| Identifier | What it identifies | Why it matters |
|---|---|---|
| Model number (917258570) | Tractor family/platform | Narrows you to the correct diagrams |
| Serial number | Exact production run | Matches mid-year revisions |
| Engine code | Engine build date | Helps for engine parts, not the tractor year |
Parts that often vary by production run
The build year matters most when belt routing, deck hardware, and steering components changed.
- Mower deck configuration and spindle/mandrel style
- Blade type and center hole pattern
- Ground drive belt length and tensioning setup
- Steering sector gear and linkage revisions
- Deck idler pulley and engagement hardware
If you’re confirming deck setup while you date the tractor, common items to compare include the husqvarna lawn tractor mulching blade, 21-in 532134149 and the lawn tractor ground drive belt, 1/2 x 82-in 532140294.
Why it matters
Craftsman 917 tractors commonly had running changes within the same model number. Using the tractor ID label and serial number prevents ordering a part that looks right but does not align, tension, or mount correctly.
Last updated: February 2026
Where is the model number on my Craftsman mower?
On a Craftsman riding mower like model 917258570, the model number is printed on a product ID label (a sticker or metal tag) mounted to the tractor frame or body. We use that exact model number to match the correct parts diagrams and replacement parts for your mower.
Common places to check on a Craftsman riding mower
Look for a label that includes MODEL and often SERIAL. On most front-engine lawn tractors, it is typically found in one of these spots:
- Under the seat on the seat pan or fender deck
- On the rear fender area near the seat
- On the frame rail near the engine (left or right side)
- Under the hood near the dash or steering column support
- Near the transmission area on the frame
What the label looks like and what to write down
The label usually lists multiple identifiers. Record them exactly as shown.
- Model number (example: 917258570)
- Serial number
- Product number (if shown)
- Engine model/type/code (helpful for engine-specific parts)
| Label item | What it’s used for | Example |
|---|---|---|
| Model number | Matches the correct mower parts list | 917258570 |
| Serial number | Confirms production run details | Varies |
| Engine numbers | Matches engine tune-up and carb parts | Varies |
Why it matters
Craftsman tractors can look similar across years, but belts, blades, steering parts, and deck components can differ. Using the exact model number helps prevent ordering the wrong deck belt, blade, or steering hardware.
Related DIY help
If you are already troubleshooting starting or maintenance issues, these guides help narrow down what to check next:
Last updated: February 2026
Who makes the Craftsman 420cc engine?
For Craftsman riding mowers, the 420cc engine is typically supplied by MTD (often through its engine brands). On a Craftsman lawn tractor like model 917258570, the most reliable way to confirm the exact engine maker is to match the engine’s model and type numbers on the engine label to the correct parts listing.
How to confirm the engine manufacturer on your tractor
Look for an engine ID label (usually on the blower housing, valve cover area, or near the starter). Then use these checks:
- Find the engine model, type, and code/spec numbers on the label
- Compare those numbers to the engine parts breakdown used for your tractor
- Check for brand cues on the label (MTD, PowerMore, Briggs and Stratton, Kohler)
- Verify the shaft orientation and mounting pattern match your tractor’s setup
- Use your tractor model number 917258570 when ordering parts to avoid mismatches
Why the maker can vary (even with the same cc rating)
“420cc” describes engine size, not the manufacturer. Craftsman has used multiple engine suppliers across different production runs and tractor series, so the engine label is the deciding factor.
Quick comparison: cc rating vs what you need for parts
| What you see | What it tells you | What to use for ordering |
|---|---|---|
| 420cc | Approximate displacement | Engine model/type numbers |
| Craftsman | Tractor brand | Tractor model 917258570 |
| Engine label brand | Actual engine maker | Exact engine ID on label |
Related maintenance that helps engine identification and reliability
While you are checking the engine label, it is a good time to handle basic upkeep that prevents hard-start and power issues:
- Clean or replace the air filter
- Use fresh fuel and a clean fuel filter (if equipped)
- Check spark plug condition and gap
- Inspect battery connections and ground cable
- Confirm the deck is not overloading the engine (dull blades increase load)
If you are troubleshooting a no-start or crank issue while identifying the engine, use riding lawn mower engine spins but wont start video.
Why it matters
The engine manufacturer determines the correct ignition parts, carburetor parts, filters, and tune-up components. Using only “420cc” can lead to ordering the wrong parts even when the tractor model is correct.
Last updated: February 2026
