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Should I use 87 or 91 gas for lawn mower?
For the Craftsman 917377150 gas walk-behind lawn mower, we recommend using fresh 87-octane (regular) unleaded gasoline; higher octane (like 91) does not add power or protection in a typical small mower engine and usually just costs more.
What to use (and what to avoid)
- Use 87 octane unleaded gasoline from a busy station (fresher fuel).
- Use ethanol-free gas when you can; it stores better and helps reduce fuel-system issues.
- Avoid old gas (more than 30 days without stabilizer).
- Avoid mixing octanes to “clean” the engine; octane is not a cleaner.
- Avoid fuel with high ethanol content (anything above E10) unless your engine specifically allows it.
Quick comparison
| Fuel choice | Works in most mowers? | Best for | Notes |
|---|---|---|---|
| 87 octane (regular) | Yes | Everyday mowing | Correct for most walk-behind mowers |
| 91 octane (premium) | Yes | Only if the engine specifically requires it | Usually no benefit in mower engines |
| Ethanol-free 87-90 | Yes | Storage, fewer carb issues | Often worth it for seasonal equipment |
If your mower is hard to start or runs rough
Fuel problems are common on walk-behind mowers. Before replacing parts, we recommend these checks:
- Drain and replace old fuel; refill with fresh 87.
- Inspect the spark plug and air filter (common tune-up items).
- If it surges or only runs with choke, the carburetor may be gummed up.
- If it starts then dies, check for restricted fuel flow and stale fuel.
A basic tune-up is often the fastest fix; the briggs & statton tune-up kit 5140B is a common maintenance bundle for many Briggs & Stratton mower engines.
Why it matters
Using the right fuel helps prevent hard-starting, surging, and carburetor varnish, especially when the mower sits between cuts or over winter.
For storage tips that prevent fuel issues, follow how to keep lawn mower gas from going bad.
Last updated: February 2026
What are the common problems with Craftsman lawn mowers?
Common problems on the Craftsman gas walk-behind lawn mower model 917377150 usually fall into a few buckets: starting issues (fuel, spark, compression), poor cutting (blade and deck), and self-propel/drive problems (belt, gears, controls). Most symptoms trace back to routine wear, stale gas, or impact damage.
Most common symptoms and what they usually mean
- Won’t start or starts then dies: old fuel, dirty carburetor, fouled spark plug, or a safety/control issue
- Hard to pull the starter rope: blade obstruction, seized blade adapter, or engine internal resistance
- Cuts unevenly or leaves strips: dull/bent blade, loose blade adapter, deck packed with clippings
- Vibrates excessively: bent blade, damaged blade adapter, or loose mounting hardware
- Self-propel won’t move or slips: worn/stretching drive belt, worn drive gears, or a failing drive control
Parts that commonly wear on model 917377150
If your symptom matches, these are frequent replacement items on walk-behind mowers:
- Cutting system: lawn mower blade 532406713, lawn mower blade adapter 581547901
- Drive system: belt 532157769, control 532184588, lawn mower drive pinion gear 532137054
- Wheels and height adjust: lawn mower wheel 532180552, husqvarna lawn mower height adjuster knob 532701037
Quick troubleshooting checklist (fast wins)
- Use fresh gas and confirm the fuel shutoff (if equipped) is on.
- Check the blade area for packed grass or debris before pulling the cord.
- Inspect the blade for bends and sharpness; replace if damaged.
- Look for drive belt wear (glazing, cracking, slack) if self-propel is weak.
- Confirm wheel/gear engagement if one side drives and the other does not.
Symptom-to-fix guide
| Symptom | Most likely cause | Typical fix |
|---|---|---|
| Won’t start | Fuel/spark issue | Tune-up, clean fuel system |
| Heavy vibration | Bent blade/adapter | Replace blade and inspect adapter |
| Won’t self-propel | Worn belt/control | Replace belt, check control cable/assembly |
| Uneven cut | Dull blade/deck buildup | Sharpen/replace blade, clean deck |
Why it matters
Catching blade, belt, and wheel-drive wear early prevents bigger failures like damaged pulleys, stripped gears, and deck damage. It also improves cut quality and reduces vibration that can loosen fasteners over time.
For step-by-step help, we recommend: lawn mower wont start troubleshooting video fuel ignition and compression and lawn mower wont move troubleshooting video motion drive failure.
Last updated: February 2026
What model number is the Craftsman 917377150?
The model number for this Craftsman gas walk-behind lawn mower is 917377150. You will typically find “917.377150” printed on the mower’s model and serial number label; use that exact number when ordering parts like a blade, belt, or drive control.
Where to find the model number on the mower
On most Craftsman walk-behind mowers like model 917377150, the model/serial label is usually located in one of these spots:
- On the rear of the deck near the discharge opening
- On the top of the deck near the engine mounting area
- On the back flap area behind the engine
- Near the height adjuster area on the deck side
How to use the model number when buying parts
Use 917377150 to match the correct diagrams and ensure fit. For example, common wear items for this model include:
- Lawn mower blade 532406713 (22-in deck mulching blade)
- Belt 532157769 (drive belt kit for self-propelled motion)
- Control 532184588 (drive control assembly)
Quick check: model number vs. part identifiers
| Item | What it is | Example from this model |
|---|---|---|
| Model number | Identifies the mower | 917377150 |
| Part ID | Sears PartsDirect identifier | 532406713 |
| Part number | Manufacturer number | 141114 |
Why it matters
Craftsman model numbers can look similar across different mower versions. Using the exact 917377150 model number prevents ordering the wrong blade adapter, wheel, belt, or hardware and helps you get the right fit the first time.
Last updated: February 2026
What size belt is a Craftsman 54 inch deck mower?
A Craftsman 54-inch deck mower typically uses a deck belt around 5/8-inch wide by about 142 1/2 inches long. For your Craftsman model 917377150 (a gas walk-behind mower), the belt size for a 54-inch deck does not apply; this model uses a self-propel drive system belt instead, such as the belt 532157769 when you’re servicing the drive.
Match the belt to the mower type
A “54-inch deck” belt is for a riding mower deck, not a walk-behind mower deck. Craftsman 917377150 is a walk-behind mower (commonly a 21 to 22-inch cutting path), so belt sizing is based on the drive system (self-propel) rather than a deck spindle layout.
Common belt-related symptoms on walk-behind mowers:
- Mower will not move or moves intermittently
- Drive feels weak, slips, or surges
- Belt squeals when engaging the drive
- Belt shows glazing, cracks, or fraying
Quick checks before you buy a belt
We recommend confirming the drive setup and inspecting the belt path first.
- Tip the mower with the air filter and carburetor facing up
- Remove the drive cover and check for belt debris or rubbing
- Verify the drive control cable has proper tension (not overly slack)
- Inspect the engine pulley and transmission pulley for wobble
- Check the belt for stretching, glazing, or missing chunks
Belt sizing: deck belt vs drive belt
| Mower type | What the belt drives | Typical belt size style | Applies to model 917377150? |
|---|---|---|---|
| 54-inch deck riding mower | Deck blades/spindles | Long deck belt (often 140+ inches) | No |
| Walk-behind self-propel | Transmission/drive wheels | Shorter drive belt (varies by design) | Yes |
Why it matters
Using a “54-inch deck” belt on a walk-behind mower leads to the wrong fit and poor performance. Matching the belt to the Craftsman 917377150 drive system helps restore traction, reduces slipping, and prevents premature belt wear.
Last updated: February 2026
What year is Craftsman Model 917377150?
Craftsman model 917377150 is a model number, not a date code, so it does not directly tell you the year. To find the year, we use the mower’s product identification label (often called the model and serial tag) and decode the serial number date information.
Where to find the date information
Look for a sticker or metal tag on your Craftsman walk-behind mower. Common locations include:
- Rear of the deck near the discharge opening
- Top of the deck near the engine mounting area
- Behind the engine, facing the handle
- Near the rear wheels or height adjuster area
How the year is typically determined
On many Craftsman mowers, the serial number contains the build date. A common format is:
- MMDDYY (month, day, year)
That means the last two digits represent the year (for example, 11 = 2011). If your serial number begins with 072811, that decodes to July 28, 2011.
Quick decode table (common format)
| Serial starts with | Month | Day | Year |
|---|---|---|---|
| 010524 | Jan | 05 | 2024 |
| 072811 | Jul | 28 | 2011 |
| 112015 | Nov | 20 | 2015 |
Why it matters
Knowing the build year helps us match the correct Craftsman 917377150 parts, especially wear items like the blade, drive belt, and drive hardware that can vary by production run.
Parts that often depend on the exact build
- Blade and blade adapter fit
- Self-propelled drive belt length
- Drive control and linkage style
- Wheel and gear components
If you are servicing the cutting system while you check the tag, use the correct blade for this model: lawn mower blade 532406713.
Last updated: February 2026
Where is Craftsman's model number?
On a Craftsman gas walk-behind lawn mower like model 917377150, the model number is typically on a printed label or stamped tag on the mower deck or rear housing. Once you have it, you can match the correct parts (blade, belt, wheels, controls) to your exact mower.
Common places to check on model 917377150
Look for a sticker or metal tag in these spots:
- Top of the mower deck, near the engine mounting area
- Rear of the deck, close to the discharge opening or rear door (if equipped)
- Between the rear wheels, on the back panel of the deck
- Under the handle mounting area, where the handle bolts to the deck
- Near the height adjuster area, along the side of the deck
Tips for finding a hard-to-read label
If the label is dirty or faded:
- Brush off grass and debris, then wipe with a damp rag
- Use a flashlight at an angle to make stamped numbers easier to see
- Take a close-up photo and zoom in
- Write down the full model number exactly as shown (all digits)
Why the model number matters
Craftsman walk-behind mowers can look similar but use different blades, drive parts, and hardware. Using the correct model number helps you avoid ordering the wrong items.
| What you’re replacing | Example part you may need for 917377150 | Why the model number helps |
|---|---|---|
| Cutting system | Lawn mower blade 532406713 | Ensures the correct length and center mounting style |
| Self-propel drive | Belt 532157769 | Matches the correct belt length and profile |
| Wheel and height system | Husqvarna lawn mower height adjuster knob 532701037 | Fits the correct axle and adjuster design |
Quick safety reminder before checking
- Shut the engine off and let it cool
- Disconnect the spark plug wire before reaching near the blade or under the deck
Last updated: February 2026
