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  1. #1
    New Member
    Join Date
    Jul 2015
    Posts
    3
    Location
    chittenango, ny
    Tractor
    CC 1320, 1641

    Default Cub 1641 Backfire/Pop Through Carb

    Hi and thanks for reading,

    I was mowing the lawn and the motor started to sound like it was missing, then stalled. I pushed it into the shed, removed the air cleaner, and the plate the air filter sits on was very wet with gas. It runs but misses, pops, backfires (but with no flames). It does not seem random. It has kind of a pattern to it. Any idea what would be causing this?

    Thanks!!!

  2. #2
    Platinum Member
    Join Date
    Mar 2006
    Posts
    948
    Location
    BEECHER CITY, IL
    Tractor
    KIOTI DK45S

    Default Re: Cub 1641 Backfire/Pop Through Carb

    You are running on one cylinder. Could be a spark plug wire shorting out, faulty plug, valve clearance issues. Just will need to start checking out things.
    ILLINOIS ENGINE, Beecher City, IL
    Briggs and Stratton MST (Master Service Technician)
    ILENGINE over at Lawnmowerforum

  3. #3
    New Member
    Join Date
    Jul 2015
    Posts
    3
    Location
    chittenango, ny
    Tractor
    CC 1320, 1641

    Default Re: Cub 1641 Backfire/Pop Through Carb

    Thanks for the quick reply! It says 16 Hp on the air cleaner but no brand of motor. Any idea who make it?

    Thanks Again!

  4. #4
    Elite Member
    Join Date
    Sep 2007
    Posts
    3,042
    Location
    Doniphan, Mo.
    Tractor
    Kubota L4240, B7800 & BX2660

    Default Re: Cub 1641 Backfire/Pop Through Carb

    Don't overlook the flywheel keyway.

  5. #5
    Platinum Member
    Join Date
    Jun 2004
    Posts
    668

    Default Re: Cub 1641 Backfire/Pop Through Carb

    Quote Originally Posted by ggloob View Post
    Thanks for the quick reply! It says 16 Hp on the air cleaner but no brand of motor. Any idea who make it?

    Thanks Again!
    It's probably a Briggs & Stratton engine. It could be a blown head gasket.

    Bob B.

  6. #6
    Platinum Member
    Join Date
    Mar 2006
    Posts
    948
    Location
    BEECHER CITY, IL
    Tractor
    KIOTI DK45S

    Default Re: Cub 1641 Backfire/Pop Through Carb

    From the short video I can confirm that it is the Briggs Vanguard engine. Model type and code will be either on a tag on the blower housing, or stamped into one of the valve covers. The vanguards will bend a pushrod now and again for no apparent reason, so that may be the issue.
    ILLINOIS ENGINE, Beecher City, IL
    Briggs and Stratton MST (Master Service Technician)
    ILENGINE over at Lawnmowerforum

  7. #7
    New Member
    Join Date
    Jul 2015
    Posts
    3
    Location
    chittenango, ny
    Tractor
    CC 1320, 1641

    Default Re: Cub 1641 Backfire/Pop Through Carb

    So...to close, and not to leave this post open and unfinished (I hate it when people do that).
    RANDYT..You were right!!!
    And here is the reason:
    You can see the front rocker pivot was installed backwards.
    Cub 1641 Backfire/Pop Through Carb-100_0487-jpg
    And this was the result.
    Cub 1641 Backfire/Pop Through Carb-100_0488-jpg
    So I inspected the other cylinder, and both pivots were installed backwards! My neighbor bought this at a garage sale for a song and a dance. The seller said the top end was just rebuilt. I'm willing to bet that they just replaced the valve seals and screwed things up putting everything back together. I'm surprised he could even drive it off the trailer, let alone finish mowing half of his lawn. I think 4 new push rods and he will be back in business.
    You folks are the best! Thanks for the guidance!!!

    GG

  8. #8
    Platinum Member
    Join Date
    Mar 2006
    Posts
    948
    Location
    BEECHER CITY, IL
    Tractor
    KIOTI DK45S

    Default Re: Cub 1641 Backfire/Pop Through Carb

    deleted
    Last edited by RANDYT; 07-14-2015 at 09:21 AM.
    ILLINOIS ENGINE, Beecher City, IL
    Briggs and Stratton MST (Master Service Technician)
    ILENGINE over at Lawnmowerforum

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