10 HP Briggs and Stratton, only runs on CHOKE. Whassup?

Discussion in 'Non-Ford Engines' started by scooper77515, Jun 23, 2012.

  1. scooper77515

    scooper77515 Accepting Hand-me-downs Supporting Member

    Joined:
    Jun 30, 2004
    Messages:
    14,578
    Likes Received:
    39
    Trophy Points:
    203
    Location:
    Dayton, TX
    Vehicle:
    74 Mav 5.0 +.040 & C4
    Every 6 months or so, I fire up my portable generator. This time, it started right up but won't run once I take it off choke. It will run on half choke, but if I back it off a little it starts to starve and will sputter out on me. Runs smoothly with choke on, with or without air filter (it is clean and new).

    My brother-in-law's machine is doing the same thing this season :huh:

    Any ideas, hints, or solutions?

    The machine is pretty much brand new. I have had it three years, run it maybe 10 or 12 hours. Fuel has been mixed with Stabil, and I swap it out every two years if I don't use it.

    Not getting enough fuel?
     
  2. MaverickDan

    MaverickDan I wanna go fast!!!

    Joined:
    Jan 1, 2007
    Messages:
    751
    Likes Received:
    17
    Trophy Points:
    68
    Location:
    Midlothian, VA.
    Vehicle:
    73 Maverick 4dr
    Sounds like the main jets are clogged. If it has a fuel shutoff next time you use it set it to off and let it run out of fuel, helps keep the carb clean.
     
  3. Jsarnold

    Jsarnold Senior Member

    Joined:
    Oct 29, 2008
    Messages:
    2,846
    Likes Received:
    1
    Trophy Points:
    100
    Location:
    Raleigh, North Carolina
    Vehicle:
    '72 Sprint
    Do you close the fuel line valve and run the fuel out of the carb after each use? If not, the carb is probably gummed up and not feeding fuel except on choke.
     
  4. scooper77515

    scooper77515 Accepting Hand-me-downs Supporting Member

    Joined:
    Jun 30, 2004
    Messages:
    14,578
    Likes Received:
    39
    Trophy Points:
    203
    Location:
    Dayton, TX
    Vehicle:
    74 Mav 5.0 +.040 & C4
    Yes, I always run it dry, then choke it to continue running until it is completely dry. I just drained and cleaned the tank, and replaced the fuel filter/petcock assembly, and the old filter and lines look fine.

    I will put it all back together and fill it with fresh fuel and squirt some seafoam aerosol into it and give it a "carb cleaning" and see if that helps.
     
  5. Dave B

    Dave B I like Mavericks!

    Joined:
    Mar 9, 2002
    Messages:
    16,891
    Likes Received:
    137
    Trophy Points:
    332
    Location:
    Parts Unknown......
    Vehicle:
    3 Grabbers
    Take the float bowl off the bottom of the carb, and see if there is a small hole drilled in the bolt that holds it on, make sure it's clean. The engine on my snowblower does that from time to time, I use stabilizer, and always run it dry in the spring.
     
  6. Jsarnold

    Jsarnold Senior Member

    Joined:
    Oct 29, 2008
    Messages:
    2,846
    Likes Received:
    1
    Trophy Points:
    100
    Location:
    Raleigh, North Carolina
    Vehicle:
    '72 Sprint
    Hope the carb cleaning and fresh fuel does it for you. Guess I should get mine out and see if it will start. :yup:
     
  7. scooper77515

    scooper77515 Accepting Hand-me-downs Supporting Member

    Joined:
    Jun 30, 2004
    Messages:
    14,578
    Likes Received:
    39
    Trophy Points:
    203
    Location:
    Dayton, TX
    Vehicle:
    74 Mav 5.0 +.040 & C4
    It seemed to help a little, but didn't fix it. Wasn't worth the $12 bucks for the bottle of Seafoam. Once again, I am not impressed with the stuff.

    So, when the engine cools down, the carb is coming off for a rebuild, or at least a cleaning.
     
  8. scooper77515

    scooper77515 Accepting Hand-me-downs Supporting Member

    Joined:
    Jun 30, 2004
    Messages:
    14,578
    Likes Received:
    39
    Trophy Points:
    203
    Location:
    Dayton, TX
    Vehicle:
    74 Mav 5.0 +.040 & C4
    OK, tore the carb down, there was just a couple pieces of crud in the bowl, and the infamous varnish smell. Cleaned it all up, reassembled, and no difference. Still runs fine one or two clicks off CHOKE, but when I flip it any further toward RUN it falls on it's face and dies.

    Runs pretty good and putting out 123V with it on semi-choke. Should I just use it like that or am I missing something?
     
  9. MaverickDan

    MaverickDan I wanna go fast!!!

    Joined:
    Jan 1, 2007
    Messages:
    751
    Likes Received:
    17
    Trophy Points:
    68
    Location:
    Midlothian, VA.
    Vehicle:
    73 Maverick 4dr
    Running it on choke at all times will use a lot of fuel and could wash out the cylinders. Did you blow through the passages with compressed air?
     
  10. scooper77515

    scooper77515 Accepting Hand-me-downs Supporting Member

    Joined:
    Jun 30, 2004
    Messages:
    14,578
    Likes Received:
    39
    Trophy Points:
    203
    Location:
    Dayton, TX
    Vehicle:
    74 Mav 5.0 +.040 & C4
    Yep. First with carb cleaner, then with compressed air, hit one spot with a q-tip in the throttle body where there was a little brown stain, and slapped it all back together.

    No go.
     

Share This Page