Owner’s manual
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Should I use 87 or 91 gas for lawn mower?
For the Craftsman 917376210 rotary lawn mower, we recommend using fresh regular unleaded gasoline (87 octane) for normal operation. Using 91 octane does not add power or improve reliability in a typical small 4-cycle mower engine; fuel freshness and proper storage matter more.
What to use (and what to avoid)
- Use fresh, clean, regular unleaded 87 octane.
- Avoid stale fuel (older than about 30 days without stabilizer).
- Avoid fuel contaminated with water, rust, or dirt.
- If your area offers ethanol-free gas, it often stores better for seasonal equipment.
- Do not mix oil into the gas (this mower uses a 4-cycle engine).
Why 91 octane usually is not better
Octane is mainly about preventing knock in high-compression engines. Most walk-behind mower engines are designed to run correctly on regular fuel, so higher octane typically does not improve starting, cutting performance, or engine life.
Fuel and storage tips for fewer starting problems
The 917376210 manual emphasizes safe fueling and storage practices, including letting the engine cool before refueling and not storing gasoline from one season to the next. Use these habits to prevent hard-start and carburetor issues:
- Let the engine cool several minutes before refueling.
- Wipe up spilled gasoline before starting.
- Store fuel in a clean, approved gas can.
- Use fuel stabilizer if fuel will sit.
- At season end, plan storage steps from the 917376210 owner's manual.
Quick comparison
| Choice | Best for | What you will notice |
|---|---|---|
| 87 octane (regular) | Everyday mowing | Normal power and starting when fuel is fresh |
| 91 octane (premium) | Not required for most mowers | Usually no performance difference |
| Ethanol-free (if available) | Seasonal storage | Often fewer stale-fuel problems |
Why it matters
Most “won’t start” complaints on gas mowers come from old fuel and varnish in the carburetor, not from using 87 instead of 91. Keeping fuel fresh and storing the mower correctly protects the fuel system and helps the engine start reliably.
Last updated: January 2026
What model number is the Craftsman 917376210?
The model number for this Craftsman walk-behind mower is 917.376210 (often written without the dot as 917376210). You’ll find it on a decal attached to the rear of the mower housing; the engine has a separate model number on the engine blower housing (see the 917376210 owner's manual).
Where to find the model number on the mower
Look for the mower’s ID decal in these common spots:
- Rear of the mower deck or rear housing (most common)
- Near the height adjustment area on the deck
- On the handle mounting area
- On a label near the discharge opening (varies by deck style)
Mower model number vs. engine model number (important)
Your Craftsman mower and its engine use different model numbers. Use the mower model number for chassis parts (blade, wheels, drive parts) and the engine model number for engine parts (carburetor, fuel line, ignition).
| What you’re identifying | Where to look | Used for ordering |
|---|---|---|
| Mower model number: 917.376210 | Rear decal on mower housing | Deck, drive, handle, wheels |
| Engine model number | Blower housing on the engine | Carburetor, fuel system, ignition |
Why it matters
Using the correct model number helps us match the right diagrams and parts for your exact mower configuration (for example, the correct 22-inch blade and the correct drive system components).
If you’re ordering a common wear item for this model, a good example is the lawn mower blade 532406713.
Last updated: January 2026
Where is Craftsman's model number?
On Craftsman rotary lawn mower model 917376210, the mower model number is printed on a decal attached to the rear of the mower housing. The engine has a separate model number, typically found on the engine blower housing; use both numbers when ordering parts or service (see the 917376210 owner's manual).
Where to look (quick checklist)
- Check the rear of the mower deck/housing for a model/serial decal.
- Wipe off grass and dirt; decals are often hidden under buildup.
- Look for the mower model formatted like 917.376210.
- For the engine model, check the blower housing (the shroud covering the flywheel area).
- Write down both the mower model and engine model before shopping for parts.
Mower model number vs. engine model number
| What you are identifying | Where it is located | Why it matters |
|---|---|---|
| Mower model number (917376210) | Rear of mower housing (decal) | Matches the correct Craftsman chassis, wheels, drive parts, and deck components |
| Engine model number | Engine blower housing | Matches the correct Briggs & Stratton engine parts (carburetor, fuel line, ignition parts) |
Why it matters
We use the mower model number to match deck and drive components, and we use the engine model number to match engine-specific parts. Having both prevents ordering the wrong blade, belt, carburetor, or fuel line.
Last updated: January 2026
