backfiring

john98April 14, 2010

I have a carftsman 21.5 riding lawn mower about 8 years old. the problem i have is the left hand side burns real nice and hot on the right side it floods out and cold i checked the coil it seems to be working fine. any options i switch the plugs and the same thing happens.

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walt2002

Posting the model number of the engine may help.

Walt Conner

    Bookmark   April 14, 2010 at 8:09AM
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baymee(LehighValleyPA)

Did you check for spark AT the plug and did you check for compression on that cylinder?

At any rate, you're probably contaminating your oil with gasoline.

    Bookmark   April 14, 2010 at 11:18AM
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john98

i do have spark at both plugs the only thing i have to do is change the oil its very old. if there is a gas smell with the oil what do i do then? after i chage the oil and there is fresh where do i go from there

    Bookmark   April 15, 2010 at 12:43PM
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tomplum

May be pull the offending valve cover and have a look?

    Bookmark   April 15, 2010 at 11:53PM
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rustyj14(W/PA)

By all means, and $4 to $5, buy a fuel shut-off valve and install it in the fuel line. Then have the carb rebuilt.

    Bookmark   April 18, 2010 at 1:32PM
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