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9 hp tecumseh engine on a craftsman snowblower - runs erractically - how do I troubleshoot?

How do I troubleshoot a 9 hp tecumseh engine that surges?

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Craftsman , Electric Snowblowers , Snow Removal Equipment
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4 Answers from these members:
Mark T
Thank you for your reply.

If you have thoroughly cleaned the passages of the carburetor and still have the same problem, it could be an air leak between the carburetor and the block. If the gaskets are leaking, the intake stroke of the piston will not pull through just the carburetor. To check for leaks run the engine and spray WD-40 around the gaskets between the block and the carburetor. Be careful spraying around the muffler because the WD-40 is flammable. You can also spray around the head gasket. it could be leaking. If the engine changes speeds, the leak is where you have just sprayed. If you have not done so I recommend replacing the spark plug also. For the head light I recommend checking the wire connection down by the engine. If the connection is fine, check the socket for a loose fitting bulb.
by Mark T Earned 1,607 community points in Craftsman
January 20th, 2011
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Manage My Life
I did what you suggested......and still the same thing. I took the carburetor apart, cleaned it with carb cleaner, replaced the o rings, needle valve, seat, carb bowl gasket and main jet gasket. What should I try next?

Symptons: Seems to run better with the choke on
Has a headlight, it works intermitently

Craftsman Snow King
MODEL # LH318SA
Spec 156554H

Carburetor 640349
by Manage My Life
January 18th, 2011
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Mark T
Thank you for your question.

I am sorry you are having a problem with the snow blower. By what you have stated, the carburetor needs to be cleaned. Over the years, the passages of the carburetor can become partly plugged and cause the problem you are having.

To clean the carburetor on your snow blower you have to tip the snow blower onto its nose. Then locate and remove the main jet securing the float bowl to the carburetor. Make sure to watch for the o-ring that seals the float bowl to the carburetor. Set the o-ring aside so it does not get sprayed with carb cleaner. The carb cleaner will swell the o-ring and it cannot be reused. Next, clean the small holes of the main jet wit a bread tie wire and carb cleaner. The float bowl needs to be cleaned also. You can use carb cleaner and a scotch brite pad. Set the float and the main jet aside. With the straw attached to the carb cleaner, spray carb cleaner up in to the tube of the carburetor where the main jet threads. This will flush out the emulsion tube. After it is flushed, you can reassemble the carburetor. Please make sure to place the o-ring onto the carburetor before installing the float bowl.

Tip the snow blower back down and check the operation. If you still have a problem, I recommend replacing the carburetor.

I have found a video on you tube that will aid in the cleaning of the carburetor.

carb cleaning



I hope this is helpful. Please reply below with any additional questions you might have.

If you do not feel confident repairing this problem yourself, then you can have it repaired by a Sears technician. Here is a link that will provide the nearest drop-off locations:

Sears Home Services

.

Thank you for using Manage my life.

Mark T.
by Mark T Earned 1,607 community points in Craftsman
January 14th, 2011
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afritz afritz
Providing a model number to your question will help an expert better your search. If you would like to reply to this thread with your model number I would be more than happy to assist you. Have a good day.
by afritz afritz Earned 1,258 community points in Craftsman
January 13th, 2011
Answered in 17 minutes
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