Owner’s manual
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What kind of engine does a Craftsman riding lawn mower have?
The Craftsman riding lawn mower model 917275390 is equipped with a low-emission 18.0 HP engine and electric start. For the exact engine make, model, and service details used on your tractor, we recommend checking the identification information listed in the 917275390 owner's manual.
What we can confirm for model 917275390
From the model-specific documentation, this tractor is described as:
- 18.0 HP lawn tractor
- 42-inch mower deck
- Electric start
- 6-speed transaxle
- Low-emission engine (operates differently than older designs)
Where to find the engine brand and model on your tractor
Engine manufacturers and exact engine model numbers are typically shown on the engine itself (not just the tractor frame). Use these common locations:
- Valve cover or blower housing label
- Sticker near the starter or recoil housing area
- Emissions label on the engine shroud
- Stamped tag near the muffler or fuel tank area
Once you have the engine model and type code, you can match the correct tune-up and fuel system parts.
Quick spec snapshot (what “kind of engine” usually means)
| Item | What you should look for | Why it helps |
|---|---|---|
| Horsepower rating | 18.0 HP (for this model) | Confirms tractor configuration |
| Engine model/type code | On the engine label | Needed for carburetor and ignition parts |
| Fuel type | Gasoline (typical for this class) | Impacts storage and starting issues |
| Emissions design | Low-emission | Affects warm-up and carb settings |
Why it matters
The engine make and model determine the correct maintenance parts (spark plug, air filter, fuel filter) and the right adjustments. For example, the manual notes that at high altitude (above 3,000 ft) or cold temperatures (below 32 F), the carburetor mixture may need adjustment for best performance.
Last updated: February 2026
What brand engine does Craftsman use?
Craftsman uses engines from multiple manufacturers across its riding mower and lawn tractor lineup. For Craftsman model 917275390, the owner’s documentation identifies it as an 18.0 HP, low-emission internal combustion engine setup; the exact engine brand is confirmed by the engine ID labels and specifications listed in the 917275390 owner’s manual.
How to identify the engine brand on your 917275390
We recommend using the tractor’s engine identification label because it matches parts and tune-up items correctly.
- Look for the engine label on the blower housing, valve cover, or near the starter
- Record the engine model, type, and code/spec numbers
- Compare those numbers to the engine specs section in the manual
- Use the engine numbers when ordering ignition, fuel, and air intake parts
- If the label is dirty, wipe it clean; do not scrape off printed codes
Common engine brands used on Craftsman lawn tractors
Across Craftsman lawn tractors, the most common engine suppliers typically include Briggs & Stratton, Kohler, and Kawasaki (varies by tractor series and production year). For your specific 917275390, the engine label is the deciding reference.
| What you check | Where to find it | What it tells you |
|---|---|---|
| Engine ID label | On the engine shroud/cover | Manufacturer and exact engine family |
| Manual specs | In the manual’s specifications section | Horsepower class and operating notes |
| Parts diagrams | Tractor parts listings | Which tractor-mounted parts fit (belts, blades, deck parts) |
Why it matters
Engine brand and engine model numbers determine the correct maintenance parts (spark plug, air filter, fuel filter) and the right troubleshooting steps for no-start, hard-start, or stalling issues. Using only “Craftsman 18 HP” often leads to mismatched parts.
Last updated: February 2026
What model number is a Craftsman 6.75 lawn mower?
A “Craftsman 6.75” description by itself is not a single model number; Craftsman used 6.75 HP on many walk-behind mowers. The model on this page is Craftsman 917275390, which is an 18.0 HP, 42-inch front-engine lawn tractor, so it is not the same product type as a 6.75 walk-behind mower. Use the ID tag on your mower to get the exact model number, then match parts and manuals.
Where to find the correct model number on a 6.75 Craftsman mower
On most Craftsman walk-behind mowers, the model number is printed on a sticker or metal tag. Check these common spots:
- Rear of the deck near the discharge chute
- Top of the deck behind the engine
- Between the rear wheels on the deck housing
- On the handle support bracket (near where the handle bolts on)
- Under the bagger door area (rear-bag models)
What the model number should look like
Craftsman mower model numbers are typically a 9-digit number (often starting with 917). Write down the full model number exactly as shown.
| What you see | What it usually means | What to do next |
|---|---|---|
| “6.75” or “6.75 HP” | Engine power rating, not the mower model | Find the mower’s model tag |
| “917.XXXXXX” | Craftsman product model number | Use it to look up diagrams and parts |
| Engine model (Briggs, etc.) | Engine identification only | Use for engine parts, not deck/chassis parts |
If you are comparing to this page’s model (917275390)
Our Craftsman 917275390 owner’s manual identifies it as a lawn tractor with an 18.0 HP engine and a 42-inch mower deck. For tractor-related identification, maintenance, and decal/parts diagrams, use the 917275390 owner’s manual.
Why it matters
Using the wrong model number is the fastest way to order the wrong blade, belt, or ignition parts. A 6.75 walk-behind mower and a 42-inch riding tractor use completely different decks, drive systems, and hardware.
Last updated: February 2026
Where can I find the Craftsman lawn mower model number?
On your Craftsman riding lawn tractor, the model number is printed on the product identification label; for this unit it appears as 917.275390 in the documentation. Use the exact model number when ordering parts so you get the correct deck, belt, and steering components.
Where to look on the tractor
Check these common label locations first (clean off grass and dirt so the print is readable):
- Under the seat pan or on the seat support area
- On the frame rail near the engine compartment
- Near the rear fender or above the transaxle area
- Under the hood on the chassis (less common)
- On the mower deck shell (sometimes a separate deck tag)
What number to write down (and what not to use)
For parts lookup, we use the model number (not the engine model or a decal number).
| What you see | What it’s used for | Example for this tractor |
|---|---|---|
| Model number | Ordering tractor and deck parts | 917.275390 |
| Engine model/type | Engine-specific service parts | Varies by engine |
| Part number on a decal | Identifies a sticker only | Not for parts lookup |
Why it matters
Craftsman tractors often share similar-looking 42-inch decks and drive systems, but the belt routing, mandrel style, and blade type can differ by model. Using 917275390 helps match the correct 42-inch deck parts such as the lawn tractor 42-in deck high-lift blade 532138971 and the v-belt 532138255.
Helpful tip from the manual
Our 917275390 owner's manual shows the tractor model number on the cover and is a good reference for identification, maintenance schedules, and deck information.
Last updated: February 2026
How much does it cost to replace a riding lawn mower engine?
Replacing the engine on a Craftsman front-engine lawn tractor like model 917275390 typically costs $1,000 to $2,500 installed. The biggest variables are the engine price, labor time (often about 6 hours on a riding mower), and any extra parts needed to make the swap reliable.
Typical cost breakdown
Most of the total is the engine itself plus shop labor; the rest is “while you’re in there” parts and fluids.
- Engine assembly (new or remanufactured)
- Labor time for removal, installation, and setup (commonly ~6 hours)
- Fluids and tune-up items (oil, filter if equipped, spark plug)
- Fuel system items (fuel line, fuel filter)
- Drive/deck items found worn during inspection (belts, pulleys, hardware)
Cost ranges you can expect
| Scenario | What’s included | Typical total |
|---|---|---|
| Engine swap only | Engine + standard labor | $1,000 to $1,800 |
| Swap + common add-ons | Engine + belts/pulleys/fluids as needed | $1,400 to $2,200 |
| Extensive refresh | Engine + multiple worn components replaced | $1,800 to $2,500 |
What to check before buying an engine
Many “needs an engine” diagnoses are actually starting, fuel, or safety-circuit problems. Use the troubleshooting and maintenance sections in the 917275390 owner’s manual to confirm the root cause.
- Battery condition and cable connections
- Fresh fuel and a clean air filter
- Spark plug condition and ignition wire connection
- Safety interlock and operator presence system operation
- Obvious wiring damage or loose fasteners
Why it matters
An engine replacement is one of the highest-cost repairs on a riding mower. Verifying the real failure first prevents spending engine-level money on a problem caused by the battery, fuel delivery, or a safety switch.
Last updated: February 2026
What year did Craftsman make the 917275390?
Craftsman model 917275390 was produced across a run of years; the exact build year is determined from the tractor’s serial number and ID tag, not from the model number alone. Use the 917275390 owner's manual to locate the ID tag and match your tractor’s configuration.
How to find the build year (fastest method)
Use the model and serial information from the tractor itself; that is what ties your machine to a specific production date.
- Locate the model/serial tag (commonly under the seat, on the frame, or near the rear fender area).
- Confirm the model number reads 917275390.
- Write down the serial number exactly, including any letters.
- Compare your tractor’s chassis, steering, and seat layout to the diagrams in the manual.
- Use the serial number when ordering parts to avoid mismatches.
Model-specific clues you can match in the manual
The documentation is labeled TRACTOR MODEL NUMBER 917.275390 and includes sections such as chassis and enclosures, steering assembly, seat assembly, decals, and an electrical schematic. Those diagrams help you confirm you are working with the correct configuration before you date it by serial.
Quick verification table
| What to check | Where | What it confirms |
|---|---|---|
| Model number | ID tag | You have the correct model family (917275390) |
| Serial number | ID tag | The tractor’s build date/production run |
| Deck decals and layout | Mower deck | Deck series and parts compatibility |
| Steering and chassis diagrams | Tractor frame | Correct steering and chassis configuration |
Why it matters
The build year and production run affect parts fit for common wear items like blades, belts, steering hardware, and deck components. Matching the serial number to the correct parts list prevents ordering the wrong replacement.
Last updated: February 2026
