Owner’s manual
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Is it worth replacing a lawn mower engine?
Yes, replacing the engine on your Craftsman 917273800 front-engine lawn tractor is worth it when the tractor’s deck, chassis, steering, and drive system are still solid and you want to extend the machine’s life for less than the cost of a comparable replacement tractor. Use the owner's manual to confirm maintenance and safety steps before any major repair.
When an engine replacement makes sense
We recommend an engine swap when the rest of the tractor is in good condition and you can address the root cause of the failure (overheating, dirty cooling fins, fuel issues, poor maintenance).
- The mower deck is structurally sound and still cuts well after blade service
- The tractor still drives properly (no chronic belt slip or transmission issues)
- You can complete basic tune-up and troubleshooting steps first (fuel, spark, air)
- You can do the work safely (the manual warns against adjustments with the engine running)
- You plan to keep the tractor several more seasons
When replacing the tractor is the better value
If multiple major systems are worn, an engine swap often turns into a larger rebuild.
- Deck shell is rusted through or badly damaged
- Steering or front axle wear is severe (wandering, excessive play)
- Repeated drive problems (belt wear, loss of drive, brake issues)
- You need several high-cost repairs at the same time
- You want a faster, lower-effort solution than a full engine swap
Quick cost-to-value check
Use this simple comparison to decide.
| What you’re comparing | Engine replacement usually wins when… | Replacement tractor usually wins when… |
|---|---|---|
| Total repair cost | Under about half the cost of a comparable tractor | Near or above half the cost |
| Condition of deck and frame | Solid, not cracked or rusted through | Structural damage or heavy corrosion |
| Time and tools | You can DIY and troubleshoot confidently | You need it running immediately |
| Future reliability | You can also fix fuel/air/cooling causes | Multiple systems are aging out |
Why it matters
A new engine can restore reliability, but it will not fix cutting or drive issues caused by worn deck components, belts, or mandrels. For example, if you are already dealing with blade or deck performance problems, you may also be looking at parts such as the lawn tractor ground drive belt, 1/2 x 82-in 532140294 or deck hardware.
Last updated: February 2026
What year did Craftsman make the 917273800?
Craftsman model 917273800 is from the LT1000-era, and it’s typically dated to the early 1990s, with 1991 commonly used as the start year for this model family. For the most accurate date range tied to your exact tractor, match the product/serial information in the 917273800 owner's manual.
How to confirm the exact year on your tractor
We recommend using the tractor’s product identification details (not just the model number), because the same model family can span multiple production runs.
- Find the model and serial tag (usually under the seat, on the frame rail, or near the engine area)
- Write down the full model number and the serial number exactly as shown
- Compare the numbers to the identification guidance in the 917273800 owner's manual
- If decals are missing or unreadable, use parts on the tractor (like ignition key style or deck components) to help confirm the build period
Quick reference: model number vs. build date
| Item | What it tells you | Why it matters |
|---|---|---|
| Model number (917273800) | Product family and configuration | Helps you pick correct parts diagrams and assemblies |
| Serial number | Production sequence and build period | Best way to narrow down the exact year |
| Engine model/type | Engine variant used during certain years | Helps when ordering engine-related maintenance parts |
Why it matters
The build year affects small but important fit details on riding mowers, especially for deck hardware, steering parts, and electrical items. Confirming the year helps you avoid ordering the wrong blade, belt, or ignition components.
Example parts that can vary by production run
- Mower blades (deck style and lift profile)
- Ground drive belt length and routing
- Steering hardware and axle components
- Electrical parts such as the ignition key and interlock switch
Last updated: February 2026
How to find Craftsman model number?
On Craftsman riding lawn tractors like model 917273800, the model number is typically printed on an ID label on the tractor frame under the seat area. Confirm the exact location and label format using the 917273800 owner's manual.
Where to look on the tractor
Check these common ID-tag locations first:
- On the frame directly under the seat (lift the seat to view the frame rail)
- On the underside of the seat pan
- Near the rear fender or seat mounting bracket area
- On the chassis frame close to the transmission tunnel
- On a label near the engine compartment opening (less common)
What the label looks like (and what to write down)
For this Craftsman tractor, the manual identifies the model as 917.273800 (often shown without the dot as 917273800). Record:
- Model number (example: 917273800)
- Serial number (if shown)
- Any product number or manufacturing code on the same tag
| Label item | Why it matters |
|---|---|
| Model number | Ensures you get the correct parts diagrams and part matches |
| Serial number | Helps confirm production variation and correct part revisions |
| Engine info (if listed) | Helps match tune-up and engine-related parts |
Why it matters
Using the exact model number prevents ordering the wrong blades, belts, and deck parts. For example, this model commonly uses 42-inch deck components such as the lawn tractor 42-in deck high-lift blade 532138971 and the lawn tractor ground drive belt, 1/2 x 82-in 532140294.
Last updated: February 2026
What engine does Craftsman riding mower use?
Craftsman riding mower model 917.273800 is a 16.0 HP lawn tractor with a 42-inch mower deck, electric start, and an automatic transmission; those are the engine-related specs called out in the 917273800 owner's manual. To identify the exact engine make and model installed on your tractor, use the engine ID label on the engine itself.
How to identify the exact engine on your 917.273800
We use the engine’s ID tag because it provides the precise manufacturer and model code needed for tune-up and fuel parts.
- Park on a level surface, set the parking brake, and remove the key
- Let the engine cool completely
- Find the engine ID label (commonly on the blower housing, valve cover, or near the starter)
- Write down the model, type/spec, and code/serial from the label
- Use those numbers to match the correct spark plug, air filter, fuel filter, and carburetor parts
What we can confirm from the manual for this model
The manual confirms the tractor configuration and power rating for model 917.273800.
| Item | Craftsman 917.273800 |
|---|---|
| Power rating | 16.0 HP |
| Deck size | 42 in |
| Starting | Electric start |
| Transmission | Automatic |
Why it matters
The tractor model number 917.273800 is best for matching chassis, deck, steering, and drive components; the engine ID label is what ensures you get the right engine maintenance parts and troubleshooting steps.
Parts that commonly affect mowing performance
If you are chasing poor cut quality (streaking, ragged grass tips, uneven cut), these deck parts are frequent wear items:
- Lawn tractor 42-in deck high-lift blade 532138971
- Husqvarna lawn tractor mandrel assembly 532130794
- Lawn tractor ground drive belt, 1/2 x 82-in 532140294
Last updated: February 2026
How much does it cost to replace a riding lawn mower engine?
For a Craftsman riding tractor like model 917273800, a full engine replacement typically costs $260 to $1,800 installed, depending on engine type, what hardware you reuse (pulleys, wiring), and local labor rates. Plan on about 6 labor hours for a typical riding mower engine swap.
What drives the total cost
- Engine price: varies by horsepower, crankshaft size, and charging system
- Labor: removal, transfer of parts, installation, and setup checks
- Extra parts: belts, keys, and hardware often get replaced during the job
- Condition issues: rusted fasteners, damaged wiring, or contaminated fuel add time
Typical cost breakdown (installed)
| Cost item | Typical range | Notes |
|---|---|---|
| Engine (part) | $200 to $1,400 | Must match crankshaft specs and mounting pattern |
| Labor | $300 to $900 | Commonly based on about 6 hours |
| Misc. parts and supplies | $20 to $200 | Belts, hardware, oil, shop supplies |
| Estimated total | $260 to $1,800 | Most jobs land mid-range when no surprises appear |
Parts commonly replaced during an engine swap
If wear items are questionable, replacing them during the engine job helps avoid paying labor twice.
- Molded ignition key 532140403 (if yours is worn or missing)
- Lawn tractor ground drive belt 532140294 (if glazed, cracked, or stretched)
- Lock nut 532409149 (for stripped or seized fasteners)
Why it matters
An engine swap only pays off when the replacement engine matches the tractor’s crankshaft and mounting specs and the drive system is in good shape; worn belts or hardware can still cause poor performance after installation.
Before you approve the repair
Use the owner's manual to review safety interlock behavior and basic maintenance checks (oil level, belts, fasteners) so you can separate a true engine failure from a cheaper no-start repair.
Last updated: February 2026
