Owner’s manual
View engine
What engine does Craftsman riding mower use?
The Craftsman front-engine lawn tractor model 917.276920 is a 26.0 HP garden tractor with a low-emission engine, electric start, and automatic transmission. For the exact engine manufacturer and model family used on your unit, match the engine ID label to the specifications in the 917276920 owner's manual.
How to identify the exact engine on your 917276920
Engine brands and model families can vary by production run, so the fastest way to confirm is by reading the engine’s ID tag (usually on the blower housing, valve cover area, or near the starter).
- Turn the key off and let the engine cool completely
- Lift the hood and locate the engine ID label or stamped model/type/code
- Write down all numbers exactly (model, type, code, and spec)
- Compare those numbers to the engine information section in the manual
- Use the engine ID when ordering tune-up items (spark plug, air filter, fuel filter)
What we can confirm from the model documentation
From the operator documentation for model 917.276920, we can confirm these model-level details:
| Item | What the manual indicates |
|---|---|
| Tractor type | Garden tractor |
| Rated power | 26.0 HP |
| Starting | Electric start |
| Drive | Automatic transmission |
| Emissions | Low-emission engine |
Why it matters
Using the correct engine identification prevents wrong-part orders and helps you follow the right maintenance schedule (oil type/viscosity, spark plug gap, air filter style). It also speeds up troubleshooting for no-start, hard-start, and poor-running symptoms.
If your engine cranks but will not start, follow the starting and choke guidance in the 917276920 owner's manual and then check common basics like fresh fuel, a tight spark plug wire connection, and a clean air intake screen.
Last updated: January 2026
What are the parts of a lawn mower engine?
On the Craftsman 917276920 front-engine lawn tractor, the engine is built from fuel, air, ignition, and mechanical systems that work together to create combustion and turn the crankshaft. For your exact layout and service points, use the 917276920 owner's manual.
Main engine systems (what they do)
- Fuel system: stores and delivers gasoline to the carburetor (fuel tank, fuel lines, in-line fuel filter)
- Air intake: cleans incoming air before it reaches the carburetor (air filter, intake housing)
- Ignition: creates spark at the right time (spark plug, ignition coil, flywheel magnets)
- Starting/charging: cranks the engine and keeps the battery charged (starter, solenoid, battery, alternator/stator)
- Lubrication: reduces wear and heat (oil sump/crankcase, oil fill, drain)
- Cooling/exhaust: controls temperature and routes exhaust safely (cooling fins, blower housing/shrouds, muffler)
Common engine-related parts you may service most often
The manual calls out routine items such as spark plug replacement and fuel filter replacement, plus keeping cooling surfaces clean to prevent overheating.
| Part or area | What it affects | Typical symptom when it fails/gets dirty |
|---|---|---|
| Spark plug | Ignition quality | Hard starting, misfire, loss of power |
| In-line fuel filter | Fuel flow to carburetor | Surging, stalling, loss of power |
| Air filter | Airflow and mixture | Black smoke, rough running, low power |
| Cooling fins and shrouds | Engine temperature | Overheating, power drop, engine damage |
Safety and service basics we follow
Before working around the engine or mower deck:
- Set the parking brake and disengage the attachment clutch
- Turn the key to STOP and remove it
- Wait for blades and moving parts to stop completely
- Disconnect the spark plug wire and keep it away from the plug
- Let hot engine and muffler parts cool before touching
Why it matters
Knowing which system you are dealing with speeds up troubleshooting. For example, “loss of power” often traces back to airflow (air filter), ignition (spark plug), or fuel delivery (fuel filter or stale fuel), and the manual’s troubleshooting chart follows that same logic.
Last updated: January 2026
How much does it cost to replace a riding lawn mower engine?
For a Craftsman riding lawn tractor like model 917276920, a complete engine replacement typically costs about $800 to $3,000 total (engine plus labor), depending on engine type, shop rates, and whether related starting or fuel parts also need service.
Typical cost breakdown
Costs vary most by engine brand/horsepower, whether the replacement is new or rebuilt, and how much teardown is required.
- Engine (new or replacement): $500 to $2,000+
- Labor (shop time): $300 to $1,000 (often 4 to 8 hours)
- Common add-ons (belts, battery, fuel system cleanup): $0 to $300+
- Pickup/delivery (if used): $0 to $150+
| Item | Typical range | Notes |
|---|---|---|
| Engine only | $500 to $2,000+ | Biggest variable is engine spec and availability |
| Labor only | $300 to $1,000 | Higher if rusted fasteners or extra diagnostics |
| Total installed | $800 to $3,000 | Most common real-world range |
What can increase the price on model 917276920
If the tractor has starting or drive issues along with engine problems, the shop may recommend fixing those at the same time.
- Weak battery or poor cable connections (extra diagnostic time)
- Starter circuit problems (solenoid, ignition switch, wiring)
- Fuel contamination (stale gas, water in fuel, clogged filter)
- Overheating damage from blocked cooling fins or grass screen
If you are chasing a no-crank symptom, the manual’s troubleshooting steps often point to checking the battery, fuse, wiring, ignition switch, and solenoid. For example, a failed solenoid is a common, lower-cost fix compared with an engine. See the 917276920 owner’s manual for the model-specific troubleshooting chart and operating guidance.
Before you replace the engine (quick checks)
These steps help avoid paying for an engine when the issue is actually fuel, ignition, or safety interlocks.
- Confirm the engine cranks (turns over) versus only clicks
- Check for fresh fuel and replace the in-line fuel filter if flow is restricted
- Inspect the spark plug and plug wire connection
- Verify the PTO is disengaged and brake pedal is depressed (safety interlocks)
- Clean the grass screen and cooling fins to prevent overheating damage
Why it matters
An engine replacement is one of the highest-cost repairs on a riding mower. A structured diagnosis first often turns an “engine problem” into a much cheaper fix (fuel delivery, ignition, or starting circuit).
Last updated: January 2026
Is it worth replacing a lawn mower engine?
Yes; replacing the engine on your Craftsman lawn tractor model 917276920 is worth it when the deck, chassis, and drive system are in good shape and the total swap cost stays well below the price of a comparable new tractor. If multiple major systems are worn out, replacement is the better value.
Quick decision checklist
- Replace the engine if the tractor drives strongly (no slipping, whining, or loss of pull)
- Replace the engine if the mower deck is straight and not rusted through
- Replace the engine if the electrical system is reliable (good starting and charging)
- Replace the engine if you can DIY the swap or labor is affordable
- Replace the tractor if it also needs major deck, steering, or transmission repairs
- Replace the tractor if the swap total is about half (or more) of a similar new unit
What to inspect first on model 917276920
Use the 917276920 owner's manual to confirm operating and maintenance checks, then inspect these high-value areas:
- Deck and blade system: the manual specifies blade bolt torque at 45 to 55 ft-lbs and correct blade alignment on the mandrel star
- Mandrels and deck hardware: wobble or bearing noise points to deck rebuild costs; a common deck component is the lawn tractor mandrel housing 587819701
- Starting circuit: a click-no-crank symptom is often battery, cables, or solenoid; one related part is the lawn tractor starter solenoid 582042802
- Overheating causes: blocked grass screen or dirty cooling fins can damage an engine; correct the root cause so a new engine lasts
Cost comparison (simple)
| If this is true | Best choice |
|---|---|
| Deck, chassis, and driveline are solid | Replace engine |
| Multiple systems need major repairs | Replace tractor |
| Swap cost is well under a new unit | Replace engine |
| Swap cost is near a new unit | Replace tractor |
Why it matters
An engine swap can extend the life of a good Craftsman tractor for years, but it is a poor investment if the deck and driveline are already near end-of-life.
Last updated: January 2026
