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TomF

Need advice on B-112 carb adjustment

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TomF
Last night we decided to try to fine-tune our B-112 carburetor after ordering and installing the second governor spring, which was missing. We got it started, but not without full choke. After warming up some, it wouldn't run without full choke. We tried opening up the main jet from 1.5 turns open up to 4 or 5 turns out, but it still needed the choke to remain running. Any ideas on what we're missing? Also, how does one adjust the throttle linkage so the desired high and low rpm ranges of the engine are achieved at the full in/out "throw" of the throttle cable? Are the stop nuts on the vertical governor control rod the only way to do this? Thanks! Tom and son Peter Feldpausch

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JeffNemes
Tom, first are you sure that the choke butterfly is where you think it is? I had this exact experience with a 3112. The choke cable had slipped. Second we thought we would have to rebuild the carb. but a lot of Gumout in all the orifices got it working OK. Throttle cable: there is an adjustment on the back side of the dash that adjusts the starting position of the cable to the governor control (hope it is not to rusted). Good Luck! MS

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