Craftsman 917374510 lawn mower Parts

No. Lawn mower spark plugs are not all the same; the correct plug depends on the engine’s thread size, reach, seat style, heat range, and required gap. For Craftsman model 917374510, the specified plug is Champion RC12YX with a 0.020 in gap (confirm in the 917374510 owner's manual).

What makes spark plugs different

Even plugs that look similar can be wrong for your engine. Match these basics:

• Thread diameter and pitch (must match the cylinder head)
• Reach (how far the plug extends into the combustion chamber)
• Seat type (gasket seat vs. tapered seat)
• Heat range (affects fouling and overheating)
• Gap (for 917374510: 0.020 in)

Quick spec check for Craftsman 917374510

Use these model-specific specs when buying or cross-referencing equivalents.

Item	Spec for 917374510	What it affects
Spark plug type	Champion RC12YX	Fit and correct operating temperature
Spark plug gap	0.020 in	Spark strength and smooth running

When to replace the spark plug

Replace the plug when performance points to ignition trouble:

• Engine won’t start or starts then stalls
• Rough running or misfiring under load
• Hard starting (especially after sitting)
• Electrode is worn, or the plug is fouled (sooty or wet)

Why it matters

Using the correct spark plug and gap for Craftsman 917374510 helps the engine start easier, run cleaner, and maintain power while mowing.

Last updated: February 2026

Yes, you can use premium gas in your Craftsman 917374510 walk-behind mower, but it does not improve performance. What matters most is using fresh, clean unleaded gasoline with no more than 10% ethanol (E10), because fuel over E10 can cause problems and void warranty coverage; see the 917374510 owner's manual.

What fuel to use (and what to avoid)

• Use fresh unleaded gasoline from a clean, approved gas can.
• E10 (up to 10% ethanol) is acceptable.
• Avoid any fuel labeled E15, E20, E85, or “flex fuel”.
• Avoid old gas (especially gas stored more than 30 days without stabilizer).
• Do not add engine or carburetor cleaner products directly into the fuel tank.

Premium vs regular: quick comparison

Fuel type	OK to use?	What you gain	Common downside
Regular unleaded (E0 to E10)	Yes	Normal starting and power	None when fresh
Premium unleaded (E0 to E10)	Yes	No meaningful benefit in most mower engines	Higher cost
Any fuel over E10 (E15+)	No	None	Fuel-system damage risk and warranty issues

Storage and “bad gas” prevention

Alcohol-blended fuels can attract moisture and create acids during storage, which can damage the fuel system. For seasonal storage or 30 days or longer:

• Run the tank low and plan to use up remaining fuel.
• Empty the tank, then run the engine until the carburetor is dry.
• Start next season with fresh fuel.
• Replace rusty gas cans to keep rust and dirt out of the carburetor.

Why it matters

Most “won’t start” and “runs rough” complaints on walk-behind mowers trace back to stale fuel, too much ethanol, or contamination. Using fresh E0 to E10 fuel protects the carburetor, fuel lines, and overall engine life.

Last updated: February 2026

The model number for this Craftsman walk-behind gas lawn mower is 917.374510 (often written without the dot as 917374510). You can confirm it on the model tag and in the 917374510 owner's manual.

Where to find the model number on the mower

We recommend checking these common locations on Craftsman walk-behind mowers:

• On a label or stamped plate on the rear of the deck (near the discharge area)
• On the deck top surface near the engine mounting area
• Near the handle mounting brackets
• Inside the rear door or near the grass bag opening (if equipped)

Why you might see two formats (with and without a dot)

Both formats refer to the same mower; the dot is a formatting style used in many manuals and parts lists.

Format you see	What it means	When it’s used
917.374510	Same model number	Owner’s manuals, diagrams
917374510	Same model number	Online parts lookup, tags

Why it matters

Using the exact model number helps us match the correct Craftsman parts and diagrams for your mower, especially for wear items like the blade, wheels, and control cable.

If you are ordering a blade for this model, a common match in the parts list is the lawn mower 21-in deck mulching blade 532406706.

Last updated: February 2026

The Craftsman lawn mower model 917374510 uses a 21-inch cutting deck (21-inch cut width). This matches the “21" Multi-Cut” specification shown in the model’s documentation, so you can shop blades and deck-related parts by 21-inch size.

How to confirm the deck size on your mower

We recommend verifying the cut width in the documentation or by checking the blade length.

• Look for “21"” in the specifications section of the 917374510 owner's manual
• Measure the blade tip-to-tip (most 21-inch decks use a blade close to 21 inches)
• Check the mower housing decal (often lists the cut width)
• Match the blade part listing to the deck size (21-inch blade for this model)

Common parts that match a 21-inch deck

A 21-inch deck size matters most when you’re replacing the blade, blade adapter, or deck baffles.

What you’re replacing	What to match	What “wrong size” can cause
Blade	21-inch deck / correct center hole pattern	Poor cut, vibration, damage risk
Mulching components	Deck style and blade type	Clumping, uneven mulching
Discharge parts	Deck opening and guard style	Poor discharge control

For this model, the blade listed in the parts breakdown is a 21-inch blade; a common match is the lawn mower 21-in deck mulching blade 532406706.

Why it matters

Deck size drives fit and performance. Using the correct 21-inch blade and compatible hardware helps prevent excessive vibration, protects the crankshaft and blade adapter, and keeps your Craftsman mower cutting evenly.

Last updated: February 2026

Craftsman model 917374510 is a rotary walk-behind lawn mower (21-inch Multi-Cut) with a 725 Series Briggs & Stratton engine; the owner’s manual does not list a specific manufacture year for this model. For the most accurate date, use the product ID label on the mower and follow the identification steps in the 917374510 owner’s manual.

How to identify the year on your mower

Most Craftsman walk-behind mowers use a model number (like 917374510) plus a separate product/serial label that carries the date code.

• Look for the product/serial label on the mower deck, rear housing area, or handle support
• Write down the serial number and any date code printed on the label
• Compare the label format to the identification section in the manual
• If the engine has its own tag, record the Briggs & Stratton engine model/type/code as well
• Keep the label info with your maintenance records for future parts lookups

What we can confirm from the manual (model-specific)

The 917374510 owner’s manual confirms these key identifiers for this exact model:

Item	What it tells you	Why it helps
Model number	917374510	Confirms the correct Craftsman parts list
Mower type	Rotary lawn mower	Narrows down deck and blade style
Deck size	21-inch Multi-Cut	Confirms blade size category
Engine family	725 Series Briggs & Stratton	Helps match engine tune-up parts

Why the year matters for parts

The manufacture year can affect small running changes (hardware, guards, handle parts) even when the model number is the same. Confirming the label date helps us match the right blade, discharge components, and fasteners the first time.

Parts that are commonly year-sensitive

If you are replacing wear items, match by model and the mower’s label info:

• Blade and blade adapter fitment (deck revisions)
• Discharge guard and mulcher door style
• Wheel and axle hardware
• Control cable and control bar routing

For example, this model uses a 21-inch blade listed in the parts breakdown; a common replacement is the lawn mower 21-in deck mulching blade 532406706.

Last updated: February 2026

On your Craftsman walk-behind mower, the model number is on the mower’s identification label; for this unit it’s 917.374510 (often shown as 917374510 on parts sites). For exact label location and diagrams for your mower, use the 917374510 owner's manual.

Where to look on a Craftsman walk-behind mower

Check these common spots first (wipe off grass and dirt so the label is readable):

• On the rear of the deck near the discharge opening or rear door
• On the top of the deck near the engine mounting area
• On the handle support brackets (left or right side)
• Near the rear wheel height adjuster area
• Under the rear skirt area (look from behind the mower)

What the model number looks like (and why it matters)

For this mower, the manual lists the model as 917.374510. That number is what we use to match the correct Craftsman parts diagrams and OEM replacement parts.

You might see	What it means	Use it for
917.374510	Full model number format from the manual	Manuals, parts lists, service references
917374510	Same model number without the dot	Online parts lookup and ordering

Tips to avoid ordering the wrong part

Using the correct model number helps ensure the blade, wheels, and hardware fit your exact deck and handle setup.

• Copy the model number exactly (include the dot if shown)
• If the label also lists a product number or serial, write those down too
• Match parts to the diagram callouts in the manual before ordering
• If you’re replacing the blade, confirm deck size; this model uses a 21-inch blade such as the lawn mower 21-in deck mulching blade 532406706

Why it matters

Craftsman model numbers can look similar across different mower builds. Using 917374510 ensures you get the right parts for the 21-inch multi-cut deck and the correct handle and safety control components.

Last updated: February 2026