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Fuel overflow on one carb

in 912 / 914 Technical Questions 6 years ago

  • Re: Fuel overflow on one carb

    by » 6 years ago

    Roger, If I were you I would change everything out, do it right so that the carbs have a fresh start. The floats, the shaft rings gaskets and all parts that can deteriorate including the rubber carb mounting flanges. Depending on the throttle install you can remove the throttle arm and the top plate that holds the outer cable and you will be able to keep the setting but I would still check the balance.
      
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  • Re: Fuel overflow on one carb

    by » 6 years ago

    It seems like there is a pretty big problem right now with floats that don't float or quickly quit floating, resulting in service instructions from Rotax calling for more frequent testing. If your existing floats test out okay, you might just want to keep using them, rather than chance replacing them with new floats that might not float for long. On the other hand, if the float problem has been corrected (anybody care to chime in?) then replacing them might not be a bad idea.
      
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  • Re: Fuel overflow on one carb

    by » 6 years ago

    Carb leaks are typically just a couple things. Usually a bowl gasket needs replacement. A float is a little too heavy and sinking and not controlling fuel level and it pukes out the vent tube. last the brass float level armature is out of adjustment and needs a little tweaking. Last and not as common as the other issues is the float needle. It could be dirt, but not common. The needle could be bad, but not common. The first three issues usually solve the problem.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
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  • Re: Fuel overflow on one carb

    by » 6 years ago

    11 year old floats are not applicable to any of the latest SB's. If they both (pair) weigh less than 7 grams and they do not have any damage or wear I would continue to use them.
      
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  • Re: Fuel overflow on one carb

    by » 6 years ago

    I agree, if the floats are within spec, then they are still good to go. The bowl gasket is another possibility but if it leaks using the electric pump while engine is not moving, (and therefore not vibrating) then it is not positive for the bowls to spill out the gasket unless the float level or needle and valve allows it. So they are all kinda interrelated. You will need to check all these things. Yes if you pull the carbs off and leave cables and brackets behind, you may get away with not balancing but there can be the slightest difference in the amount the carbs go back in the bracket which effectively changes the cable length. You should really balance the carbs. But see how it feels
      
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