Owner’s manual
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How much does it cost to replace a riding lawn mower engine?
For a Craftsman riding tractor like model 917275391, a full engine replacement (parts plus labor) typically costs about $800 to $2,500 total, depending on engine type, shop labor rates, and whether related items (belts, pulleys, wiring) also need service. Confirm your exact engine specs in the 917275391 owner's manual.
Typical cost breakdown
Engine replacement cost usually comes from three buckets:
- Engine assembly: commonly $500 to $1,800 (varies by horsepower, shaft size, and charging system)
- Labor: commonly 4 to 8 hours at local shop rates
- Extras (often needed): fuel line parts, battery service, deck/drive belt service, hardware
| Cost item | Typical range | What changes the price |
|---|---|---|
| Engine (new) | $500 to $1,800 | Brand, horsepower, crankshaft dimensions, charging output |
| Labor | $300 to $900 | Hourly rate, rusted fasteners, wiring complexity |
| Related parts | $0 to $400 | Belt wear, pulley wear, fuel system condition |
What to check before you buy an engine
We recommend ruling out common “no start” causes first because they are far cheaper than an engine:
- Verify battery condition and cable connections
- Check spark plug condition and correct gap (listed in the manual’s product specifications)
- Replace the in-line fuel filter once each season; a clogged filter can mimic engine failure
- Clean the engine cooling fins/air screen to prevent overheating and damage
- Confirm the engine is running at full throttle while mowing for proper performance
If the tractor cranks but will not start, use riding lawn mower engine spins but wont start video to walk through the most common checks.
Why it matters
An engine swap is one of the highest-cost repairs on a riding mower. Doing a quick fuel, ignition, and cooling-system check first prevents unnecessary replacement and helps protect the new engine from repeat failures.
Last updated: February 2026
What engine does Craftsman riding mower use?
The Craftsman riding mower model 917275391 uses a Briggs & Stratton single-cylinder engine, listed in the parts breakdown as Briggs model 31H777-0297-E1. For the exact engine identification details and service notes for your tractor, use the 917275391 owner's manual.
How to confirm the engine on your tractor
Use these quick checks to match what you have on the machine:
- Check the engine ID label on the blower housing or valve cover (model, type, code)
- Compare the engine model number to the manual parts list (engine section)
- Verify the tractor model tag shows 917275391
- Confirm your deck and drivetrain match the manual (42-inch deck, geared transaxle)
- If ordering parts, match by engine model and the engine label code, not horsepower decals
Engine details at a glance
| Item | What we use for matching |
|---|---|
| Tractor model | 917275391 |
| Engine brand | Briggs & Stratton |
| Engine type | Single-cylinder |
| Engine model (manual listing) | 31H777-0297-E1 |
Why it matters
The engine model number is what ensures you get the right ignition, fuel, and tune-up parts (like air filter, spark plug, and carburetor components). Horsepower markings and deck size help describe the tractor, but the engine model and code are what make parts matching accurate.
Last updated: February 2026
What model number is a Craftsman 6.75 lawn mower?
“Craftsman 6.75” is an engine horsepower label used on multiple Craftsman walk-behind mowers, so the model number is not determined by “6.75” alone. For your Craftsman tractor documentation, our 917275391 owner's manual is for model 917275391 (18.0 HP, 42-inch deck), not a 6.75 walk-behind mower.
How to find the correct model number on a Craftsman 6.75 mower
Look for the model tag on the mower, then match that full number when ordering parts.
- Check the rear of the deck near the discharge chute
- Look under the seat area (if it is a self-propelled style with a rear cover)
- Check the handle support brackets or the back panel
- Write down the full model number exactly as shown (all digits)
- Also record the engine model and type from the engine shroud (helpful for tune-up parts)
What to do once you have the model number
With the correct model number, you can pull the right diagrams and parts list and avoid ordering the wrong blade, belt, or air filter.
| What you have | What it tells you | What to do next |
|---|---|---|
| “6.75” marking | Engine power family only | Keep searching for the model tag |
| Craftsman model number (example: 917.XXXXXX) | Exact mower identity | Use it to look up parts and the correct manual |
| Engine model/type code | Exact engine configuration | Use it for engine-specific parts (filter, plug, carb kit) |
Why it matters
Craftsman used the same “6.75” labeling across many mower builds; the deck size, blade adapter, drive system, and carburetor linkage can differ. Using the full model number prevents mismatched parts and repeat repairs.
Last updated: February 2026
What year did Craftsman make the 917275391?
Craftsman model 917275391 is a 2005 front-engine lawn tractor. To confirm the year for your exact unit, match the model and product/serial information on the tractor’s ID label to the specifications and parts breakdowns in the 917275391 owner's manual.
How to confirm the year on your specific tractor
Use the tractor’s identification label and engine tag to verify you have the correct production year and configuration.
- Find the model/product ID label (commonly under the seat, on the frame rail, or near the engine)
- Record the model number (917275391) and the product/serial number exactly
- Compare your tractor’s decals and chassis layout to the diagrams in the manual
- Check deck identification; many units in this series use a 42-inch deck
- Verify the engine tag; the manual lists a Briggs engine model 31H777-0297-E1 for this configuration
What the manual helps you match
The manual is labeled for TRACTOR model number 917.275391 and includes component lists that help you confirm configuration before ordering parts.
| What to check | What you’re matching | Why it helps |
|---|---|---|
| Model number format | 917.275391 vs. your ID label | Confirms you have the right manual |
| Deck size markings | 42-inch deck decals and deck layout | Prevents ordering wrong blades/belts |
| Engine model tag | Briggs model/type code vs. manual listing | Confirms correct engine configuration |
Why it matters
The correct model year and configuration determine parts fit for high-wear items like blades, belts, and deck hardware. For example, a 42-inch deck commonly uses specific blade styles such as the lawn tractor 42-in deck high-lift blade 532138971.
Last updated: February 2026
Where can I find my lawn mower engine model number?
On Craftsman lawn tractor model 917275391, you’ll find the engine model information on the engine itself, usually on the blower housing (engine shroud) or on a valve cover label. Your 917275391 owner's manual also lists the engine identification in the engine section.
Where to look on the engine
Check these common spots first (clean the area so the numbers are readable):
- Blower housing/shroud near the starter or air intake
- Valve cover label or tag
- Engine block stamping near the cylinder head
- Emissions label on the shroud (often includes model family info)
- Frame or hood area for the tractor model tag (this is the tractor model, not the engine model)
What to write down
Record the full engine ID exactly as shown; it’s what engine parts suppliers use.
- Engine model number
- Type number (or specification number)
- Code/date number (helps match revisions)
| ID you find | Typical format | What it’s used for |
|---|---|---|
| Engine model | Numbers and letters (varies by engine maker) | Matches the correct engine parts list |
| Type/spec | Often a second line near the model | Narrows to the exact build |
| Code/date | Usually a longer code | Confirms production version |
Why it matters
The tractor model number 917275391 is used for chassis and deck parts; the engine model and type are used for engine-specific parts like air filters, carburetor kits, and ignition components.
Last updated: February 2026
