Carburetor 640096 640300 632738 for Tecumseh Snow Blower Engine HSK850-8310C HSK850-8310D TH139SA-8310G TH139SP-8701D

Carburetor 640096 640300 632738 for Tecumseh Snow Blower Engine HSK850-8310C HSK850-8310D TH139SA-8310G TH139SP-8701D

This carburetor is engineered as a direct replacement for the Tecumseh Snow Blower Engine HSK850-8310C HSK850-8310D TH139SA-8310G TH139SP-8701D. Manufactured to meet or exceed OEM specifications, it delivers reliable performance in demanding conditions. Each unit is tested for fuel flow, pressure rating, and durability before leaving the factory to ensure consistent quality across every order.

Replaces OEM Part Numbers

640096 • 632738 • 640300 • Tecumseh • Engine • HSK850-8310D • HSK850-8310E • HSK870-8701A • HSK870-8701B • HSK870-8701C • TH139SA-8310F • TH139SA-8310G

Signs You Need a Replacement

If your equipment is showing any of these symptoms, the carburetor may be the cause:

• Engine floods easily — The float valve isn’t seating properly, allowing fuel to overflow into the bore. The engine loads up with fuel and won’t start until it clears.
• Lean surging at cruise speed — A blocked main jet or partially clogged passage causes the engine to run lean under steady throttle. It surges as the mixture alternates between lean and rich.
• Black smoke and rich smell — Too much fuel relative to air. Check the choke mechanism, float level, and jet sizes if the carburetor has been modified.
• Fuel dripping from the carburetor — A worn needle and seat or stuck float allows fuel to overflow. This is a fire hazard and should be fixed immediately.
• Hard starting when cold — The choke circuit may be blocked or the enrichment valve stuck. Cold-start problems on a carbureted engine almost always trace back to the choke.
• Inconsistent idle speed — The idle mixture screws may need adjustment, or there’s a vacuum leak at the carburetor base gasket.

Rebuild Tips

Before installing the new carburetor, clean the manifold surface and check the gasket for any damage or vacuum leaks. Set the idle mixture screws to the baseline position (typically 1.5 turns out from fully seated) before starting. After starting, warm the engine to operating temperature, then fine-tune the mixture screws for the highest smooth idle. Adjust the idle speed screw last. If the engine backfires through the carburetor, check the valve adjustment and ignition timing.

Frequently Asked Questions

Can I cross-reference 640096 with 632738?
Yes. Both 640096 and 632738 are interchangeable OEM numbers for this part. They refer to the same component with the same specifications, just different part number revisions.

How do I check if my engine code (HSK850, HSK870) matches?
The engine code is stamped on a metal tag attached to the engine block, usually near the timing belt cover or on the cylinder head. Compare the code you find with the list above. Engine codes are 3 to 6 characters long.

Should I rebuild or replace the carburetor?
If the throttle shaft has lateral play or the carburetor body is warped, replacement is the better option. A rebuild kit handles gaskets, jets, and needles but can’t fix mechanical wear. For most applications, a new carburetor costs about the same as a professional rebuild when you factor in labor.

You May Also Need