Owner’s manual
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Should I use 87 or 89 gas for lawn mower?
Use 87-octane unleaded gasoline (regular) in your Craftsman 917388111 walk-behind mower; higher octane such as 89 does not improve performance in typical small 4-cycle mower engines. For best starting and reliability, use fresh fuel and follow the fuel and storage guidance in the owner's manual.
What to use (and what to avoid)
- Use: fresh, clean 87-octane unleaded gasoline
- Avoid: old or stale gas (a common no-start cause)
- Avoid: fuel contaminated with water or dirt (can cause hard starting and rough running)
- Do not store gas from one season to the next; replace it with fresh fuel
- Keep your gas can clean and replace it if it starts to rust
Quick troubleshooting if fuel choice is causing problems
If the mower is hard to start or runs poorly after refueling, check these common fuel-related items:
- Confirm the tank has fresh gas (not last season’s)
- Drain and replace fuel if you suspect stale fuel
- If you suspect water in fuel, drain the tank and refill with fresh gas
- Check the air filter and spark plug condition (fuel issues often show up alongside these)
Fuel-related symptoms and likely causes
| Symptom | Most common fuel-related cause | What to do |
|---|---|---|
| Won’t start | Out of fuel or stale fuel | Refill with fresh 87-octane; replace old fuel |
| Starts then dies | Water in fuel | Drain tank and refill with fresh fuel |
| Runs rough/surges | Contaminated fuel | Replace fuel; clean up any debris in the fuel system |
| Strong varnish smell | Old fuel left in system | Drain and refill; run engine to circulate fresh fuel |
Why it matters
Small-engine carburetors and fuel passages are sensitive to stale fuel, rust, and moisture. Using the correct octane (87) plus keeping fuel fresh helps prevent no-start issues and reduces the chance of deposits that shorten engine life.
Last updated: February 2026
What model number is the Craftsman 917388111?
The model number is 917.388111 (often written without the dot as 917388111) for this Craftsman gas walk-behind rotary lawn mower. You can confirm it on the mower’s rear housing decal and in the owner's manual.
Where to find the model number on the mower
Look for the identification decal in one of these common spots:
- Rear of the lawn mower housing (most common on this model)
- Near the engine mounting area on the deck
- On or near the handle bracket area
Why you might see it written two ways
Both formats refer to the same mower:
- 917.388111: manual and decal format
- 917388111: parts lookup and online format
| Format you see | What it means | Use it for |
|---|---|---|
| 917.388111 | Official model marking style | Confirming the exact mower ID |
| 917388111 | Same model number without punctuation | Searching parts diagrams and parts lists |
Why it matters
Using the exact model number ensures you get the right Craftsman walk-behind mower parts and diagrams, especially for fit-critical items like the blade, blade adapter, and control cable.
Related parts you may match by model
If you are identifying the mower to order parts, these are common model-matched items shown for 917388111:
Last updated: February 2026
What year is Craftsman Model 917388111?
Craftsman model 917388111 is identified by its model number, not by a built-in “year code.” For this mower, the most reliable way to determine the year is to use the date of purchase you recorded and the serial number on the rear housing decal, as shown in the owner's manual.
Where to find the date information on model 917388111
You can confirm the mower’s identity and locate the date fields using the documentation and the mower’s decal.
- Check the rear of the mower housing for the model and serial number decal.
- Look in your paperwork for the date of purchase (the manual provides a place to record it).
- Match the model format shown in the manual: 917.388111 (same model, different punctuation).
- If the decal is dirty or faded, clean it gently so the serial number is readable.
Why “917388111” does not directly tell the year
On Craftsman walk-behind mowers, the 917 prefix is a model series identifier, and the remaining digits identify the specific configuration. The year is not encoded in the model number itself; it is tied to the serial number and your purchase date.
Quick comparison
| Identifier | What it tells you | Where to find it |
|---|---|---|
| Model number (917388111) | Which mower you have and which parts fit | Decal on mower housing; owner's manual |
| Serial number | Production tracking information used to narrow down build timeframe | Decal on rear housing |
| Date of purchase | The date you bought it (often the best “year” reference for owners) | Receipt; recorded in manual |
Why it matters
Knowing the correct year or production range helps us match the right walk-behind mower parts and avoid fit issues when replacing common items like the blade, mulcher door, or zone control cable.
Last updated: February 2026
