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Thread: Briggs 3.5 hp Classic

  1. #1

    Briggs 3.5 hp Classic

    I have a mower as stated above, Model 9D902 Type 2005B2 Code 0111155

    I need guidance in setting up the carb linkages/springs. When running the motor idles good, at high idle the rpm increases but I can hear a soft backfire. I removed the air cleaner and when I move the throttle lever clockwise I get a better rpm.

    This makes me think I connected the linkages incorrectly. This motor is off a lawn mower (yes I changed the flywheel) and does the job good. A good picture reply is appreciated.

    Thank,
    Dave
    Attached Images Attached Images

  2. #2
    Not sure what your asking. I have a 3.5 classic that I'll take some pics if you need.

  3. #3

    Re: Briggs 3.5 hp Classic

    I want to know if I have the carb springs/linkages conected correctly.

  4. #4
    Ok. From your pic they don't look too bad to me. But I'm not 100%. I'll look at mine tomorrow and see if it'll help any. .

  5. #5

    Re: Briggs 3.5 hp Classic

    Hi again,
    I found a diagram for my carb (#52) in attachment. I also found out where the extra spring goes...
    My next question is: when running the motor I hear a very faint or soft backfire/missing. Any suggestions on how to eliminate this?
    Attached Images Attached Images

  6. #6

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    Re: Briggs 3.5 hp Classic

    Quote Originally Posted by buster01 View Post
    Hi again,
    I found a diagram for my carb (#52) in attachment. I also found out where the extra spring goes...
    My next question is: when running the motor I hear a very faint or soft backfire/missing. Any suggestions on how to eliminate this?
    What exhaust is fitted to it as I cant see on the pictures.
    If its a round one and it sounds like a "putt" noise now and again then its the just the normal sound of the engine.
    They changed the exhaust to a rectangle low tone exhaust to try and sort this noise.
    The "best" engine you will ever own!

    Briggs & Stratton MST.

  7. #7

    Re: Briggs 3.5 hp Classic

    It has the round exhaust.

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