Craftsman 917273421 lawn tractor Parts

For a Craftsman lawn tractor like model 917273421, a full engine replacement typically runs $260 to $1,800 installed, depending on the engine type, labor rates, and whether related items (battery cables, fuel lines, belts) also need service. Plan on several hours of labor for a riding mower.

What drives the total cost

• Engine type and horsepower: OEM-style replacements usually cost more than generic equivalents
• Labor time: riding mower engines take longer to swap than walk-behind engines
• Extra parts found during teardown: worn belts, pulleys, wiring, or fuel components
• Fuel system condition: stale fuel and clogged filters often show up with hard-start complaints
• Safety interlock issues: seat switch, brake switch, and PTO switch problems can mimic “bad engine” symptoms

Before you replace the engine: confirm it is the real failure

Many “needs an engine” symptoms are caused by starting, fuel, or safety interlock problems. Our manual for this tractor explains that the engine should only start with the brake/clutch fully depressed and the attachment clutch disengaged, and it should shut off if the operator leaves the seat under certain conditions. Use the 917273421 owner’s manual to verify the correct start and safety-interlock behavior.

• If it clicks but won’t crank, check battery, cables, solenoid, and starter circuit
• If it cranks but won’t start, check fuel quality, fuel filter, spark plug, and wiring
• If it dies when you release the brake, check the brake/seat safety circuits

A common electrical suspect on many tractors is the PTO switch; if the mower deck engagement circuit is acting up, the switch.pto.3 582107601 is the model-matched part to compare against.

Typical cost breakdown (installed)

Cost item	Typical range	Notes
Replacement engine	$150 to $1,400	Varies by brand, spec, and availability
Labor	$100 to $600	Often 3 to 6+ hours depending on setup
“While you’re in there” parts	$10 to $200+	Belts, filters, clamps, hardware

Why it matters

An engine swap is one of the highest-cost repairs on a riding mower. Spending a little time confirming fuel, wiring, and interlock operation first helps you avoid replacing a good engine and fixes the real root cause faster.

Last updated: January 2026

On the Craftsman lawn tractor model 917273421, the engine system is built around fuel delivery, air intake, ignition, lubrication, and exhaust components that work together to create power. Common engine-related parts include the fuel tank, air cleaner, spark plug/ignition, carburetor, and muffler; our 917273421 owner's manual also ties these to operating controls and troubleshooting.

Core engine parts and what they do

• Fuel system: fuel tank, fuel lines, fuel filter, carburetor (stores and meters fuel)
• Air intake: air filter/air cleaner element and intake screen (keeps dirt out)
• Ignition: spark plug and ignition coil (creates spark to ignite the fuel-air mix)
• Lubrication: crankcase and engine oil (reduces wear and heat)
• Exhaust: muffler (reduces noise and routes exhaust gases)

Engine-related controls you will see on this tractor

Your 917273421 uses operator controls that directly affect engine starting and operation:

Control	What it affects	What you notice when it is off/misused
Ignition switch	Starts and stops the engine	No crank or engine shuts off
Throttle/choke control	Starting and engine speed	Hard starting, low power
Clutch/brake pedal	Starting interlock and stopping	Won’t start unless pedal is set
Attachment clutch switch (PTO)	Engages mower blades/attachments	Blades won’t engage or engine may stall

Quick troubleshooting clues (engine performance)

When the engine loses power or runs poorly, the manual points to these common causes:

• Faulty spark plug or loose spark plug wire
• Dirty fuel filter, stale fuel, or water in fuel
• Plugged air cleaner element or intake screen
• Dirty/clogged muffler
• Carburetor out of adjustment (service adjustment)

Model-specific parts you may replace during engine-related repairs

These parts on our model page are often involved when diagnosing fuel delivery or blade-load issues:

• Husqvarna lawn tractor fuel tank 532151346 (fuel storage)
• Husqvarna lawn tractor muffler 532149723 (exhaust restriction and noise control)
• Lawn tractor blade idler pulley 532139245 (deck load that can feel like “engine bogging”)

Why it matters

Knowing which system you are working on (fuel, air, ignition, exhaust, or lubrication) helps you diagnose faster and avoid replacing the wrong parts, especially when symptoms overlap (for example, low power can be fuel-related or caused by a clogged muffler).

Last updated: January 2026

The Craftsman lawn tractor model 917273421 uses an 18 HP, electric-start engine (as shown in the 917273421 owner's manual). To identify the exact engine manufacturer and model (such as Briggs and Stratton), read the engine ID label on the engine itself.

How to identify the exact engine on model 917273421

Look for the engine identification tag; it provides the details you need for tune-up parts and service specs.

• Lift the hood and locate the ID label on the blower housing, valve cover, or engine shroud
• Write down the engine model, type, and code (or spec number)
• Use those numbers when selecting the correct spark plug, air filter, fuel filter, and carburetor parts
• Compare the engine ID information to the engine and maintenance sections in the 917273421 owner's manual
• If the label is dirty, wipe it clean; if it is missing, use the tractor model number 917273421 plus photos of the engine to match parts by application

What we can confirm from the manual

The manual confirms the power rating and starting system for this tractor; deck size and engine brand can vary by configuration, so the engine ID label is the deciding reference.

Manual item	What it tells you
18 HP	Engine power class used for operation and maintenance planning
Electric start	Uses a battery, starter, and solenoid; battery condition affects cranking
Model 917273421	The tractor platform used to match chassis and deck parts

Why it matters

The engine ID is what ensures the correct maintenance parts and settings (oil type, spark plug gap, air filter style). Horsepower alone does not uniquely identify the engine.

Last updated: January 2026