Craftsman 143961005 engine Parts

Craftsman uses engines from several manufacturers, and the brand depends on the specific Craftsman model. For Craftsman engine model 143961005, the parts list includes Tecumseh-labeled components (such as a pre-filter), which points to a Tecumseh-built small engine for this model.

What you will see on Craftsman equipment

Across Craftsman lawn and garden equipment, common engine suppliers include:

• Briggs & Stratton
• Kohler
• Kawasaki
• Tecumseh (especially on many older Craftsman engines)

How to confirm the engine brand on model 143961005

Use the engine ID information on the engine itself to match parts correctly.

• Find the engine ID tag or stamped numbers on the blower housing or shroud
• Record the full model and specification numbers
• Use those numbers to select the correct tune-up and repair parts for 143961005
• Match maintenance parts by shape and mounting style (air filter, pre-filter, fuel line)

Parts on this model page that support the Tecumseh match

These items are typical Tecumseh small-engine service parts and are listed for model 143961005:

• Tecumseh lawn & garden equipment engine pre-filter 35881 (air intake pre-filter)
• Craftsman lawn & garden equipment engine air filter 28424 (main air filter)
• Craftsman lawn & garden equipment engine fuel line 30962 (fuel delivery)

What you are checking	Why it helps identify the engine	Example from this model page
Air intake parts	Filter style often matches a specific engine family	Pre-filter and air filter listings
Fuel system parts	Line sizes and routing are engine-specific	Fuel line
Ignition parts	Module style varies by OEM	Ignition module listings

Why it matters

Engine brand and spec numbers determine the exact air filter, carburetor parts, ignition module, and gaskets that fit. Matching parts to Craftsman 143961005 prevents hard starting, surging, and repeat repairs.

Last updated: February 2026

Many Craftsman mowers described as “6.75” use different model numbers depending on the exact mower and engine combination; one common example is Craftsman model 917377911 (21-inch 6.75-hp rotary mower). To match yours correctly, we use the model number from the mower’s ID tag, not the horsepower label.

Where to find the correct model number

Look for a sticker or metal tag on the mower, then match the full number exactly.

• Under the seat area or rear deck (walk-behind: near the back of the deck)
• On the side of the deck near the rear wheel
• Near the handle mount brackets
• On the frame by the engine mounting area
• Sometimes on the bagger frame (if equipped)

“6.75” is not a model number (why that matters)

“6.75” is typically an engine power description used across multiple Craftsman mower models. The model number is what we use to pull the correct illustrated parts list for items like the air filter, fuel line, and carburetor.

What you see	What it tells us	What to do
“6.75” on the shroud/decal	Engine power family	Keep looking for the ID tag
Craftsman mower model number (often starts with 917.)	Exact mower configuration	Use this to find the right parts
Engine model number (often Tecumseh-style numbers)	Exact engine build	Use this for engine-specific parts

If you are working on the engine (model 143961005)

If your engine tag shows 143961005, you are already on the correct engine parts list for that Craftsman engine. Common maintenance and fuel/air issues on this engine often involve the air filter, pre-filter, fuel line, or carburetor.

• Replace a dirty filter with Craftsman lawn & garden equipment engine air filter 28424
• If equipped with foam, service the tecumseh lawn & garden equipment engine pre-filter 35881
• Fix cracked or leaking fuel supply with Craftsman lawn & garden equipment engine fuel line 30962
• Address hard-starting or surging with Craftsman lawn and garden equipment engine carburetor 632242

Why it matters

Using the exact model number prevents ordering the wrong parts and helps ensure correct fit, fuel delivery, and safe engine operation after repair.

Last updated: February 2026

On your Craftsman lawn and garden engine, the engine model number is typically stamped directly into the metal on the engine shroud or cylinder area. For model 143961005, start by checking the top of the cylinder and the sides of the engine block for a stamped or engraved number.

Where to look on the engine

Check these common locations first (wipe dirt and oil off before reading):

• Top of the cylinder head or near the spark plug area
• Side of the engine block, near the muffler or carburetor
• Recoil starter housing or blower housing (often near the pull-start)
• Valve cover area (if equipped)
• A metal tag or decal on the shroud (if still present)

How to read it and avoid mix-ups

Engine identification is often grouped together. Here is what you may see and what it means.

What you see	What it usually means	Why it matters
Model number	The engine family/series identifier	Ensures parts diagrams match your engine
Spec number	The exact configuration (governor, carb, crank)	Prevents ordering the wrong carburetor or gasket
Serial number	Production run identifier	Helps confirm revisions and production changes

Why it matters for parts and repairs

Using the correct engine model number helps us match the right tune-up and fuel system parts for your Craftsman engine, such as the Craftsman lawn & garden equipment engine air filter 28424 or the Craftsman lawn and garden equipment engine carburetor 632242. A close-looking engine can still use different gaskets, linkages, or ignition parts depending on the spec.

Quick prep checklist before you search parts

• Let the engine cool completely
• Disconnect the spark plug wire to prevent accidental starting
• Clean the stamping area with a rag and a little degreaser
• Write down the full model and any spec/serial numbers exactly as shown

Last updated: February 2026

You can get replacement parts for your Craftsman engine model 143961005 directly from the parts list for that model on Sears PartsDirect; matching the model number first is the fastest way to ensure the part fits and functions correctly.

Best way to buy the right part for model 143961005

We recommend starting with the model-specific parts list, then choosing the exact part by name and ID.

• Confirm the engine model number is 143961005 on the ID tag
• Match the part by function (air intake, fuel, ignition, starter)
• Replace gaskets and seals when you remove a carburetor or intake part
• Use the same maintenance type parts (oil, air filter, pre-filter) at regular intervals
• If your engine is hard to start, check air, fuel, and spark before ordering major parts

Common replacement parts customers order for this engine

These are examples of model-matched parts available for Craftsman 143961005:

What you are fixing	Part to check first	What it affects
Runs rough, lacks power	Craftsman lawn & garden equipment engine air filter 28424	Airflow and fuel mixture
Fuel smell, leaks, won’t stay running	Craftsman lawn & garden equipment engine fuel line 30962	Fuel delivery and safety
Won’t start, fuel issues suspected	Craftsman lawn and garden equipment engine carburetor 632242	Starting and throttle response
No spark or intermittent spark	Lamination 35135B	Ignition spark timing

Why the model number matters

Craftsman outdoor power equipment engines can have similar-looking parts that mount differently or use different linkages. Using the exact model number 143961005 helps prevent ordering an air filter, carburetor, or ignition module that does not seal correctly or connect to your throttle and fuel system.

If you are shopping for parts beyond the basics

If you do not see what you need in the featured list, use the full model parts breakdown for 143961005 to locate assemblies such as the starter, flywheel, muffler, fuel tank, and internal engine components.

Last updated: February 2026