Owner’s manual
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Where can I find the Craftsman riding mower model number?
On your Craftsman riding mower, the model number is typically printed on an ID decal on the tractor frame. For this unit, the owner’s manual identifies the tractor as model 917.273398 (often shown as 917273398 on parts listings); use that exact number when looking up parts and diagrams in the owner's manual.
Common places to check on a riding mower
Look for a sticker or metal tag in one of these spots:
- Under the seat (lift the seat and check the frame pan)
- On the rear fender area near the seat
- On the frame rail near the engine compartment
- Near the footrest area on the left or right side
- Under the hood on the chassis (not on the engine itself)
Tractor model number vs. engine model number
Many owners find an engine ID first, but the tractor model number is what you need for the correct Craftsman 917273398 parts list.
| What you’re identifying | Where it’s found | What it’s used for |
|---|---|---|
| Tractor model number (example: 917273398) | Tractor frame ID decal | Parts diagrams for deck, steering, chassis, belts |
| Engine model/type/code | Stamped plate or label on the engine | Engine-specific tune-up and internal engine parts |
Why it matters
The same 42-inch deck and V-twin style engine can appear on multiple tractors, but linkages, belts, mandrel parts, and decals vary by tractor model. Using 917273398 helps ensure you match the correct mower deck parts (like blades and mandrel components) and hardware.
Last updated: February 2026
What year was Craftsman 917273398 made?
Craftsman lawn tractor model 917.273398 was produced as part of a model series that spans multiple production runs, so there is not one single “made year” tied to the model number alone. To pinpoint the exact year for your tractor, match the serial number and product ID information shown on the tractor to the identification details in the owner's manual.
How to find the exact year on your tractor
On most Craftsman front-engine lawn tractors, the identification label is easy to access and is the fastest way to date the unit.
- Look for the model and serial number label under the seat (common location on this style of tractor).
- Check the frame area near the seat pan and rear fender area if you do not see it under the seat.
- Write down the serial number exactly as shown (letters and numbers).
- Compare the label details to the identification and parts information in the manual.
- If the label is damaged, use the tractor’s key components and deck configuration to confirm the correct parts list for 917.273398.
What we can confirm from the documentation
The manual documentation for this tractor clearly identifies the model and key assemblies (useful when confirming you have the correct model before dating it).
| Item in documentation | What it tells you | Why it helps |
|---|---|---|
| Model number shown as 917.273398 | Confirms the exact model family | Prevents mixing up similar 917.x tractors |
| 42-inch mower deck parts listing | Indicates the deck size used on this configuration | Helps verify the tractor matches the 42-inch deck setup |
| Electrical and chassis parts diagrams | Confirms major assemblies used on this model | Helps cross-check if the tractor has been modified |
Why it matters
The exact build year affects which parts and specifications apply, especially for wear items and deck components like blades, mandrel parts, and electrical pieces. Once you confirm the tractor’s identification label details, you can order the correct replacement parts with confidence.
Last updated: February 2026
How much does it cost to replace a riding lawn mower engine?
Replacing the engine on a Craftsman lawn tractor model 917273398 typically costs about $800 to $3,000 total (engine plus labor), depending on the exact engine, whether you reuse pulleys and wiring, and local shop rates. Use the owner's manual to confirm engine and safety procedures before planning the repair.
What drives the total cost
Engine replacement pricing varies because the engine is only part of the job. Common cost drivers include:
- Engine type and horsepower (single-cylinder vs. V-twin)
- Crankshaft size and orientation (must match your pulley and PTO setup)
- Electrical compatibility (charging system, starter, safety interlocks)
- Fuel system condition (old fuel lines, filter, tank contamination)
- Labor time (shop access, rusted fasteners, seized pulleys)
- Extra parts discovered during teardown (belts, idlers, wiring)
Typical cost ranges (parts and labor)
These ranges fit most front-engine riding mowers and lawn tractors like the 917273398.
| Scenario | What’s included | Typical total cost |
|---|---|---|
| Repair existing engine | Carburetor/fuel, ignition, tune-up items | $150 to $700 |
| Replace with a compatible new engine | Engine + installation labor | $800 to $3,000 |
| Replace plus “while you’re in there” items | Engine + belts, pulleys, battery, wiring fixes | $1,200 to $3,800 |
Before you replace the engine, rule out common no-start issues
Many “needs an engine” symptoms are caused by starting or fuel problems. We use these quick checks first:
- Battery connections clean and tight; battery holds charge
- Starter solenoid clicks but starter does not crank (often solenoid, cables, or starter)
- Fresh fuel and a clean fuel filter
- Spark plug and plug wire secure
- Air filter not clogged
- Safety interlock switches working (seat, brake, PTO)
If the engine clicks but will not turn over, follow riding lawn mower engine clicks but doesnt turn over video.
Why it matters
A correct engine match prevents pulley misalignment, PTO engagement problems, and charging issues. It also helps you avoid paying labor twice if the replacement engine does not fit your crankshaft or wiring.
Last updated: February 2026
What kind of engine does a Craftsman riding lawn mower have?
For Craftsman lawn tractor model 917273398, the owner’s manual identifies it as an 18.0 HP riding mower with an emissions-compliant engine design. For the exact engine manufacturer, engine model number, and tune-up specifications, use the identification and specifications sections in the 917273398 owner's manual.
How to identify the exact engine on your tractor
Even within the same tractor model, the engine family and spec number are confirmed by the engine ID label (not the deck size or marketing description).
Check these locations:
- On the engine blower housing (often near the recoil shroud or valve cover area)
- Near the starter or muffler heat shield
- On a valve cover label plate (varies by engine)
- In the manual’s product specifications and service sections
What we can say for model 917273398
The manual cover for model 917273398 calls out these key traits:
- 18.0 HP rating
- Electric start
- 6-speed transaxle
- 42-inch mower deck
Quick reference
| Item | What to use | Why it matters |
|---|---|---|
| Engine make and model | Engine ID label | Ensures correct filters, plug, and carb parts |
| Engine tune-up specs | Manual product specifications | Correct plug type, gap, and service intervals |
| Deck-related parts | Deck parts list/diagram | Ensures correct blades and mandrel parts |
Related parts owners commonly replace
If your question is really about what fits the mower deck (not the engine), these model-matched deck blades are common replacements:
- Lawn tractor 42-in deck high-lift blade 532138971 (best for bagging or side discharge)
- Husqvarna lawn tractor mulching blade, 21-in 532134149 (mulching blade option listed for the 42-inch deck)
Why it matters
Using the engine ID label and the manual specs prevents ordering the wrong ignition parts, filters, or service items. It also helps you match the correct blade style to your cutting goal (mulch vs bag/discharge).
Last updated: February 2026
