Engine backfiring?
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    Engine backfiring?

    The B&S V-Twin in my LA135 keeps backfiring and popping and it seems to be getting worse. It does it at all RPMs, but less so at idle.
    Here's a video of it at WOT:

    2008 LA135 Limited Edition

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    HouseMouse's Avatar
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    I would start with a fresh set of spark plugs, drain the fuel tank and refill with fresh fuel,drain carburetor sediment bowl, and change fuel filter. Then go from there....
    Last edited by HouseMouse; 11-05-2015 at 06:38 PM.
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    Could be getting lean/hot. Could also be carbon buildup or possibly a burnt valve.


    How long does it have to be running for it to happen?

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    Quote Originally Posted by HouseMouse View Post
    I would start with a fresh set of spark plugs, drain the fuel tank and refill with fresh fuel. Then go from there....
    I should have mentioned, it does have fresh plugs and I've put 10 hours on it since I've acquired it in September, so lots of gas has gone through it. I even installed new fuel and air filters.
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    2008 LA135 Limited Edition

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    Have you cleaned the carburetor?
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    Quote Originally Posted by 1977212 View Post
    Could be getting lean/hot. Could also be carbon buildup or possibly a burnt valve.


    How long does it have to be running for it to happen?
    It almost smells like it's running a bit rich. When you engage the mower deck, the popping stops. I have the mower deck off now since I'm using it to sweep leaves.

    It starts the popping only after less than a minute of running. It runs strong, other than the popping.
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    2008 LA135 Limited Edition

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    Quote Originally Posted by dieselshadow View Post
    Have you cleaned the carburetor?
    My father said he did, since the fuel shut off solenoid was sticking and causing it to not start. I'm not sure how long ago that was though. I ordered a new gasket set for it, and that's my next plan, to tear apart the carb and see how clean it is.
    Just wondering if you all had any other thoughts!
    2008 LA135 Limited Edition

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    Gunk in the float bowl and needle and seat not closing.

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    I have an old B&S Twin on a Craftsman that does the same even after changing the carb, the intake manifold an plug and don't know what else. I think the cam is wearing.


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    If you close the choke, partially or fully, does the popping go away?

    At idle, take a can of WD40 or other flammable aerosol, and spray around the intake and carb, see if the idle changes. If the idle changes you have an air leak.

    What kind of shape is the muffler in?
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