Craftsman 917270621 tractor Parts

For a Craftsman riding lawn tractor like model 917270621, a full engine replacement (parts plus labor) typically runs about $260 to $1,800, with around 6 labor hours common for a riding mower engine swap. Exact cost depends on the engine type, shop rates, and any extra parts needed.

What drives the total cost

• Engine price: new, rebuilt, or used engine options vary widely
• Labor rate: local shop rates and minimum charges
• Extra parts: belts, pulleys, wiring, fuel line, or mounting hardware found worn during teardown
• Tune-up and setup: throttle/choke adjustment, governor setup, and blade engagement checks
• Pickup/delivery: transport or trip charges if you are not bringing the tractor in

Quick cost breakdown (typical ranges)

Cost item	Typical range	Notes
Replacement engine	$200 to $1,500	Biggest variable; depends on horsepower and crankshaft specs
Labor	$200 to $600	Often based on ~6 hours for riding mowers
Misc. parts/fluids	$20 to $200	Oil, filter, fuel filter, clamps, hardware

Before you replace the engine

If the tractor will not start or cranks poorly, we recommend ruling out common no-start causes first. These checks often cost far less than an engine swap:

• Verify the battery is strong and cable connections are clean and tight
• Confirm the operator presence and interlock system is working (the manual calls for checking it regularly)
• Check engine oil level and basic maintenance items (air filter, spark plug)
• If it clicks but will not crank, test the starter circuit and solenoid

For model-specific maintenance intervals and troubleshooting steps, use the 917270621 owner's manual.

Why it matters

Engine replacement is one of the highest-cost repairs on a riding mower. A quick diagnostic and maintenance check can prevent unnecessary replacement and can also protect the new engine if you do install one.

Last updated: January 2026

The Craftsman tractor model 917270621 is shown in our documentation with a Briggs & Stratton engine model 28U707, type 1174-E1. For the most accurate match to your exact tractor, confirm the model and type on the engine ID label and compare it to the 917270621 owner's manual.

How to confirm the engine on your tractor

Use the engine’s ID label as the final check, especially if the tractor was repowered.

• Park on a level surface, set the parking brake, and remove the key
• Find the Briggs & Stratton ID label (commonly on the blower housing, valve cover area, or near the starter)
• Record the model, type, and code from the label
• Match 28U707 and 1174-E1 to the engine listing in the manual
• Use the full model and type when selecting carburetor, ignition, and gasket parts

What the engine numbers mean

Engine ID item	Example for this tractor	What it’s used for
Model	28U707	Identifies the engine family and core configuration
Type	1174-E1	Identifies the exact build variation for correct parts
Code	Varies by engine	Indicates the production date for running changes

Why it matters

Briggs & Stratton engines can look similar across multiple Craftsman tractors. Using the correct model and type prevents wrong-part returns and speeds up troubleshooting for issues like hard starting, stalling, or poor fuel delivery.

Last updated: January 2026

On the Craftsman lawn tractor model 917.270621, the owner’s manual identifies the engine as a Briggs & Stratton 15.5 HP engine (often shown as “B&S” in parts listings). That means this tractor is not a Craftsman 420cc-engine model.

How to confirm what engine you have

Use these quick checks to match the engine to your tractor:

• Look for the engine brand badge on the blower housing (top of the engine)
• Check the engine model and type numbers stamped on the engine shroud
• Compare the engine information to the specifications section in the 917.270621 owner’s manual
• Verify the tractor model number on the frame tag matches 917.270621
• If the engine was replaced, use the replacement engine’s model/type numbers (not the tractor model)

What “420cc Craftsman engine” usually refers to

“420cc” is a displacement rating used on some single-cylinder engines. Craftsman-branded equipment can be built with engines sourced from different manufacturers depending on the product line and year.

What you’re looking at	What to use for identification	What it tells you
Tractor model tag	Tractor model number (917.270621)	Which tractor parts fit
Engine shroud stamping	Engine model/type/code	Who made the engine and which engine parts fit
Owner’s manual specs	HP, tune-up specs, capacities	Maintenance requirements

Why it matters

Engine manufacturer and engine model numbers determine the correct tune-up parts (spark plug, air filter, fuel filter) and service procedures. Using “420cc” alone can lead to ordering the wrong parts.

Last updated: January 2026