Owner’s manual
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Should I use 87 or 91 gas for lawn mower?
For the Craftsman 917370449 gas walk-behind mower, we recommend using regular 87 octane gasoline; higher octane (like 91) does not add power or protection in a typical small 4-cycle mower engine. Use fresh fuel and the correct oil level to prevent hard starting, surging, and plug fouling; see the 917370449 owner's manual for the exact fuel guidance.
What to use (and what to avoid)
- Use: Fresh, clean 87 octane unleaded gasoline.
- Avoid: Old gas (more than 30 days without stabilizer), contaminated fuel, or fuel stored in open containers.
- Skip “premium” for performance: 91 octane is mainly for high-compression engines; most walk-behind mowers do not need it.
- Use stabilizer for storage: Especially before winter or any 30+ day downtime.
- If your area sells E15/E85: Do not use it; stick with standard pump gas typically labeled E10 or less.
Quick comparison
| Fuel choice | Works in most Craftsman walk-behind mowers | When it makes sense |
|---|---|---|
| 87 octane (regular) | Yes | Everyday mowing, best value |
| 91 octane (premium) | Yes, but unnecessary | Only if 87 is unavailable |
| Old/varnished gas | No (common no-start cause) | Never |
| E15/E85 | No | Never |
Why it matters
Using the right fuel helps your 917370449 start easier and run smoother. Most “mower problems” blamed on octane are actually caused by stale gas, water in the fuel, or a dirty carburetor jet.
If the mower runs rough after refueling
- Drain the tank and refill with fresh 87 octane.
- Check the air filter and spark plug condition.
- If the mower still surges or won’t start, follow the steps in lawn mower wont start troubleshooting video fuel ignition and compression.
Last updated: January 2026
What model number is the Craftsman 917370449?
The model number is 917370449. On this Craftsman walk-behind gas lawn mower, you’ll typically find the model number on the mower’s ID label (often on the rear of the deck or near the handle mounting area); confirm the exact location in the Craftsman 917370449 owner's manual.
Where to find the model number on the mower
Look for a sticker or metal tag that lists the model and serial information.
- Check the rear of the mower deck (behind the engine area)
- Check the left or right side of the deck near the wheels
- Check the handle bracket area where the handle bolts to the deck
- Wipe off grass and dirt; the label is often hard to read when dirty
- Write down both the model and serial number for parts matching
What to match when ordering parts
For Craftsman model 917370449, we recommend matching the model number first, then confirming the part by diagram location and description.
| What you’re checking | What it helps prevent | Example on this model page |
|---|---|---|
| Model number (917370449) | Ordering parts for the wrong mower series | Confirms correct parts list |
| Part ID | Mix-ups between similar-looking parts | Husqvarna lawn mower 22-inch deck 3-in-1 blade 532421825 |
| Part name and function | Installing the wrong style (mulch vs side discharge) | Blade, deflector, belt |
Why it matters
Craftsman walk-behind mowers can share similar decks and engines across multiple series, so the model number is the fastest way to ensure the blade, drive belt, and control cables you choose are the correct fit and length.
Last updated: January 2026
What year is my Craftsman mower serial number lookup?
For Craftsman model 917370449, the manufacture date is commonly encoded at the start of the serial number as MMDDYY (month, day, year). A serial beginning with 072811 reads as July 28, 2011. Verify the exact ID format in the 917370449 owner's manual.
How to decode the serial number (common MMDDYY format)
Use this checklist when your serial starts with 6 digits:
- Digits 1 to 2: month (01 to 12)
- Digits 3 to 4: day (01 to 31)
- Digits 5 to 6: year (00 to 99)
- Write it as MM/DD/YY
- If your serial includes letters or a different pattern, use the manual’s identification section to match the correct format
Quick examples
| Serial starts with | Interprets as | Build date |
|---|---|---|
| 072811 | 07/28/11 | July 28, 2011 |
| 113022 | 11/30/22 | November 30, 2022 |
| 010524 | 01/05/24 | January 5, 2024 |
Why it matters
The build year helps us match the correct Craftsman parts and any running changes for your 917370449, especially for wear items like the blade, drive system, and discharge components.
If your serial number does not look like MMDDYY
These steps still get you to the right year and the right parts match:
- Find the model and serial tag on the deck or rear housing
- Compare the serial pattern to the identification section in the 917370449 owner's manual
- Order parts by the full model number first; for example, confirm the exact blade listed for your mower, such as the husqvarna lawn mower 22-inch deck 3-in-1 blade 532421825, by matching the part number to your diagrams and hardware
Last updated: January 2026
