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Float replacement service bulletin

in 912 / 914 Technical Questions 10 years ago
I just received my airworthy certificate last week, I have about 14 hours on the engine. Before first flight i checked my right and left carb to see if the Floats where in spec according to SB-912-65UL. They were just in spec by one ml on each side. At 4000 rpm in the traffic pattern i experienced roughness in the engine. I advanced the throttle three times and was able to clear the roughness away. Does this sound like i need the new floats. My serial number falls with in the service bulletin.

  • Re: Float replacement service bulletin

    by » 10 years ago

    Hi Nate,

    It could be a heavy float, but fairly low hours. The limit is 7 grams, not sure what ML is?
    Have the carbs been synced? Is fuel puking out the vent tube on the carb? Double check for smooth throttle movement too.

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

      
    Report

  • Re: Float replacement service bulletin

    by » 10 years ago

    Hi Roger, It is fairly low hours. But when i looked up the service bulletin my serial number was included. My plane has been ready to fly for the last 7 months. I have been taxing it on the ground about once a week week up until I was issued my airworthiness certificate. I purchased a duel needle manifold pressure gauge to sync the carbs. It is very smooth through out the entire rpm range. Also when the roughness occurred i was able to clear it by advancing and retracting the throttle three times. And then the motor acted smooth like it did before. When i fallowed the procedure in SB-912-65ul the ML refers to Milliliters of gasoline that I injected into the side of the carb with a syringe. it is hard to get exact measurements with this method the SB states that anything below 23 ML is not acceptable. I did this to both carbs and the amount of fuel i measured was about 24 ML on each side. It is hard to do this and not spill Gas but the measurement i had was very close to the lower limit that is stated in the service bulletin. And if you factor in plus or minus 10%. My carbs floats could be below the limit... I will weigh them next. I ordered the new floats from California power system but they said the new style floats would not be available until June 9. I have had in my possession my motor since Jan of 2014. So if you take into account shipping that would make my motor a 2013.
    Thanks for your help.
      
    Report

  • Re: Float replacement service bulletin

    by » 10 years ago

    Hi Nate,

    Sorry you're having to go through this with a new plane and one I'm sure you want to be in the air with.
    I don't care for the milliliter method. It's just easier and better for me to just weigh them. Sounds like you have had fuel in the bowls for a while. It sure does sound like a heavy float(s). Maybe someone here has a set of floats to sell? May or may not be the newest ones, but still may be new and could get you back in the air.

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

      
    Report

  • Re: Float replacement service bulletin

    by » 10 years ago

    When is the best time to Call, I want to respect your day off.
      
    Report

  • Re: Float replacement service bulletin

    by » 10 years ago

    Hi Nate,

    A day off, what's that? :lol:

    It really doesn't matter when you call. I take calls all days and all hours. I really don't have any schedule.

    Roger
    520-349-7056

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

      
    Report
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