Craftsman 917379071 rotary lawn mower Parts

For the Craftsman 917379071 rotary lawn mower, use 87 octane gasoline; higher octane (like 91) does not add power or protection in a mower engine and usually just costs more. The bigger priority is using fresh, clean fuel and the correct oil level.

What to use (and what to avoid)

• Use 87 octane (regular unleaded) for normal mowing.
• Use fresh gas; old fuel is a top cause of hard starting and rough running.
• Avoid fuel that has been sitting in the can or tank for weeks; replace it with fresh fuel.
• If your area sells ethanol-blended fuel, keep it fresh and store it properly to reduce varnish and moisture issues.
• Do not “upgrade” octane to fix performance problems; address the real cause (fuel quality, air flow, spark, or carburetion).

Quick comparison: 87 vs 91 in a walk-behind mower

Fuel choice	What you get	Best use case
87 octane	Correct everyday fuel for most mower engines	Routine mowing and normal temperatures
91 octane	No meaningful performance gain in typical mower engines	Only if the engine specifically calls for it in the manual

If the mower runs poorly, check these first

• Drain and replace old fuel; refill with fresh 87.
• Inspect the blade for damage or heavy buildup; a bent or dull blade can load the engine (see lawn mower blade 532406713).
• Check the drive system if the mower feels sluggish or will not self-propel; a worn belt can slip (see belt 532157769).
• Verify the throttle control moves freely and returns properly (see lawn mower throttle cable 532168552).
• Follow the fuel and maintenance guidance in the 917379071 owner's manual.

Why it matters

Using the right fuel keeps starting easy, reduces carburetor deposits, and helps your Craftsman mower maintain steady RPM under load. Octane is not a “cleaner” or “stronger” fuel by itself; freshness and proper storage matter more.

Last updated: January 2026

Craftsman model 917379071 is identified by its product date code, which gives you the year it was built. On many Craftsman walk-behind mowers, the date code is read as MMDDYY, so the last two digits indicate the year.

How to find the year on model 917379071

We recommend using the date-code instructions and location diagrams in the Craftsman 917379071 owner's manual. In most cases, you will find the code on a label near the engine, deck, or rear housing.

• Look for a sticker or stamped tag that includes a 6-digit number (often near the model/serial label)
• Read the code as MMDDYY (month, day, year)
• Use the last two digits as the year (example: 11 = 2011)
• If the label is dirty or faded, wipe it clean and use a flashlight at an angle
• Record both the model number and the date code for parts matching

Date code examples (MMDDYY)

Example code	Month	Day	Year
072811	07	28	2011
041915	04	19	2015
101020	10	10	2020

Why it matters

The build year helps us match the correct parts and configurations for your Craftsman rotary lawn mower, especially for wear items like the blade, drive system, and control cables.

If you are servicing the cutting system while you check the label, inspect the blade and adapter for damage or wobble; a bent blade or worn adapter can cause vibration and poor cut quality. The lawn mower blade 532406713 is a common replacement item for this model.

Last updated: January 2026

On a Craftsman walk-behind mower like model 917379071, the model number is typically on the mower’s ID label or stamped tag on the deck or handle area, not on the engine itself. For exact label locations and diagrams, use the 917379071 manual.

Common places to check on a walk-behind mower

Look for a sticker, metal tag, or stamped plate in these spots:

• Rear of the mower deck, near the discharge opening
• Top of the deck near the engine mounting area
• Back flap area (behind the bagger opening)
• Handle bracket or lower handle mount points
• Under the deck lip (wipe grass and dirt off first)

Mower model number vs. engine model number

Your mower has two different identifiers; both can matter when ordering parts.

What you are identifying	Where to find it	What it’s used for
Mower model number (example: 917379071)	Deck/handle ID label or tag	Ordering Craftsman chassis, drive, and deck parts
Engine model/type/code	Stamped on the engine shroud or valve cover area	Ordering engine-specific parts like carburetor or ignition parts

Tips to find it faster

• Clean the deck and handle area with a dry rag; labels are often hidden by clippings.
• Use a flashlight and look at a low angle; stamped numbers can be faint.
• Write the number down exactly as shown; a single digit change can pull the wrong parts list.
• If you are servicing the drive system, match the mower model first, then confirm parts like the belt 532157769 if your diagrams call for it.

Why it matters

The mower model number ties your Craftsman rotary lawn mower to the correct parts diagrams (blade, belt, wheels, height adjusters). The engine number is separate and only applies to engine components.

Last updated: January 2026