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    Another B&S 550EX in a Troy-Bilt TB110 push mower

    Thanks, but I have confirmed that the auto choke is working as it should: choke butterfly is completely closed when cold, fully open when hot. I can't fault the choke. Also, after reading some other comment somewhere, I checked to see if the choke lever was able to get hung up against the air...
  2. A

    Another B&S 550EX in a Troy-Bilt TB110 push mower

    Greetings! New member here. A neighbor was gifted the above referenced mower; told me it started and ran fine for at least one lawn mowing (and many years with previous owner), then she filled with some bad/old gas and it hasn't worked since. I offered to go into it for her, believing with all...
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