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Old 11-19-2010, 07:19 PM   #1
In2deep73
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Default Help!! Tecumseh backfires!!

Hello. I have a Tecumseh snow blower and it runs, but it sounds as if it is backfiring. If I slowly prime it while it is running, however, the problem gets better. I took the carburetor off and rebuilt it (took the welch plugs out, soaked in acid etc.), and it still does the same thing. The flywheel key is perfect, as well as the air gap for the magneto. What is the next step? Perhaps reseating the valves? Thank you for your help.

EDIT: It sounds like it may be a loud misfire possibly?

Last edited by In2deep73; 11-19-2010 at 07:26 PM.
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Old 11-20-2010, 10:37 AM   #2
Shryp
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Default Re: Help!! Tecumseh backfires!!

Have you tried adjusting the carb or it is one of those newer non adjustable ones?

Mine would backfire a little bit when I had it set too rich.
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Old 11-20-2010, 11:59 AM   #3
In2deep73
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Default Re: Help!! Tecumseh backfires!!

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Originally Posted by Shryp View Post
Have you tried adjusting the carb or it is one of those newer non adjustable ones?

Mine would backfire a little bit when I had it set too rich.
It is a non adjustable EPA crap carburetor. I tend to think it is running too lean because if I slowly prime it, the problem gets better, but maybe it is my imagination. I took the valves out last night they both look good. I'm going to reface the valves and see what happens. Thank you.
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Old 11-20-2010, 05:16 PM   #4
rscurtis
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Default Re: Help!! Tecumseh backfires!!

Save your time on the valves. If it starts OK, the valves are good. Locate the idle jet on the carb, it may be under a plastic plug. Remove it and clean the orifice on the end. Hopefully, that will solve your problem.

Keep in mind that a Tecumseh engine on a snowblower is not going to run like a Honda or Vanguard- they are noisy, tend to vibrate, and don't always run steadily, that's the nature of the beast.
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Old 11-20-2010, 05:20 PM   #5
In2deep73
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Default Re: Help!! Tecumseh backfires!!

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Originally Posted by rscurtis View Post
Save your time on the valves. If it starts OK, the valves are good. Locate the idle jet on the carb, it may be under a plastic plug. Remove it and clean the orifice on the end. Hopefully, that will solve your problem.

Keep in mind that a Tecumseh engine on a snowblower is not going to run like a Honda or Vanguard- they are noisy, tend to vibrate, and don't always run steadily, that's the nature of the beast.
I checked the idle screw before I even rebuilt the carburetor and it was fine. I even checked the idle circuit etc. Maybe if I drill out the jet a little bit it might fix the problem??? These emissions carburetors are terrible...
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Old 11-20-2010, 06:11 PM   #6
Fcubman
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Default Re: Help!! Tecumseh backfires!!

Try running it with the choke partially closed - an improvement will prove that it's running lean. If it gets worse, it's running rich.
I assume that your spark plug and ignition are in good shape.
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Old 11-20-2010, 06:12 PM   #7
In2deep73
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Default Re: Help!! Tecumseh backfires!!

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Originally Posted by Fcubman View Post
Try running it with the choke partially closed - an improvement will prove that it's running lean. If it gets worse, it's running rich.
I assume that your spark plug and ignition are in good shape.
Wow, thats a great idea. Don't know why I didn't think of that lol. I'll try that.
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Old 11-20-2010, 06:27 PM   #8
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Default Re: Help!! Tecumseh backfires!!

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Wow, thats a great idea. Don't know why I didn't think of that lol. I'll try that.
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