Craftsman 143975501 engine Parts

The model number 143975501 is an engine model number, not the lawn mower model number. For a Craftsman mower, the mower’s model number is typically on the mower deck or frame (often a 9-digit number starting with 917). Use that mower model number to match the correct parts list.

Where to find the mower model number

Check these common locations on Craftsman walk-behind mowers:

• A sticker or tag on top of the mower deck near the engine
• The rear of the deck near the height-adjustment area
• The frame near the handle mounts
• Under the rear flap (bagging area) on some designs
• Near the wheel height adjuster on the side of the deck

Engine model vs. mower model (what each one does)

Number you have	What it identifies	What you use it for
143975501	The Craftsman engine	Engine parts like carburetor, ignition, seals
917XXXXXX (typical)	The Craftsman mower	Mower parts like wheels, blade adapter, deck hardware

If you only have 143975501 and need parts

If you are shopping for engine parts using model 143975501, start with the most common service items for fuel and starting issues:

• Tecumseh lawn and garden equipment engine carburetor rebuild kit 632760B (fixes leaking, surging, hard start)
• Needle seat 631021B (common cause of flooding and fuel overflow)
• Float 632019A (helps control fuel level in the carburetor bowl)
• Lawn & garden equipment engine fuel tank cap 37845 (can affect venting and fuel flow)

Why it matters

Using the correct model number prevents ordering the wrong parts. The mower model number matches deck and chassis components, while 143975501 matches engine-specific parts such as the carburetor, recoil starter rope, and ignition components.

Last updated: February 2026

Craftsman is a brand name, so Craftsman engines are made by different manufacturers depending on the specific machine and production run. For the Craftsman engine model 143975501, the most reliable way to identify the actual engine maker is to match the engine’s ID numbers and then use the correct replacement parts list.

How to identify who made your Craftsman 143975501 engine

Look for an engine ID tag or stamping (often on the blower housing, valve cover area, or near the muffler). Use these checks:

• Find the engine model/type/code numbers stamped on the engine (not the mower model).
• Compare the format of the numbers (some makers use distinct model-code patterns).
• Match what you find to the parts used on your engine (carburetor parts, ignition parts, starter parts).
• If the engine has been rebuilt, confirm parts by visual match (carburetor style, linkage, mounting pattern).
• Use the parts list for model 143975501 to confirm compatibility before ordering.

Parts that help confirm the engine family

On small engines, the carburetor and ignition system are often the quickest “fingerprint.” If your engine uses these parts, it helps narrow down the correct configuration:

System	Common confirming part	Example from this model’s parts
Fuel/carburetor	Needle/seat, float, bowl	Needle seat 631021B, float 632019A, lawn & garden equipment engine carburetor float bowl 631951
Ignition	Coil/lamination, stop wire	Lamination 34443D, Craftsman lawn & garden equipment engine stop wire terminal 610973
Starting	Recoil rope, electric starter parts	Craftsman lawn & garden equipment engine recoil starter rope, 98-in 590535

Why it matters

Different manufacturers (and even different engine versions from the same maker) use different carburetor gaskets, ignition coils, and seals. Identifying the correct engine maker and configuration prevents ordering a part that looks close but does not fit or tune correctly.

Last updated: February 2026

A Craftsman lawn and garden engine like model 143975501 is built around fuel delivery, ignition, and rotating internal components that create power. Common engine parts include the fuel tank and carburetor, ignition coil, starter system, crankshaft, and seals and gaskets that keep fuel, air, and oil where they belong.

Main lawn mower engine parts (what they do)

• Fuel system: fuel tank, fuel cap, fuel line, carburetor, float, needle and seat
• Air intake: intake manifold, carburetor cover, (air filter on many engines)
• Ignition system: ignition coil (lamination), stop wire/terminal, spark plug (varies by engine)
• Starting system: recoil starter rope, starter motor (on electric-start models)
• Internal rotating parts: crankshaft, connecting rod, piston and rings
• Sealing parts: O-rings, oil seals, carburetor gaskets

Examples of parts we list for Craftsman 143975501

These are real, commonly serviced components for this model that map to the systems above:

Engine system	Example part on this model	What it affects
Fuel delivery	Needle seat 631021B	Fuel metering; helps prevent flooding or fuel starvation
Carburetor sealing	Craftsman lawn and garden equipment engine carburetor gasket 26756	Air leaks and fuel leaks at carb mounting surfaces
Starting	Craftsman lawn & garden equipment engine recoil starter rope, 98-in 590535	Pull-start engagement and recoil function
Ignition	Lamination 34443D	Spark generation (no-spark or weak-spark symptoms)
Leak prevention	Craftsman lawn & garden equipment engine oil seal 27897	Oil control around rotating shafts

Why it matters

Knowing which “system” a part belongs to helps you troubleshoot faster. For example, hard starting and surging often point to the fuel system (carburetor, float, needle/seat), while a no-start with no spark points to the ignition system.

Quick troubleshooting map (symptom to likely area)

• Starts then dies: carburetor, fuel cap venting, fuel flow
• Surges at idle: carburetor gasket leak, dirty carb passages
• Fuel leaking: float/needle seat, O-rings, bowl sealing
• No spark: ignition coil/stop wire issues
• Oil leak: oil seal, crankcase sealing surfaces

Last updated: February 2026