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After a carb adjustment and the recent replacement of the carb boots for seemingly "loose' fit, I started my engine and the right carb fell off! I was going to do a TEST FLIGHT prior to a long cross country. :ohmy: I reseated the carb on the boot and noticed that the limiting collar on the band clamp was allowing me to tighten the screw but not actually tighten the boot to the carb.
I removed the limiting collar and "torqued" the band clamp. I know the limiting spacer was designed to keep me from doing what I just did, but give me a break. It's staying off. Does anyone safety wire the carb to the manifold? there are safety wire holes on the carb flange. I have seen some models with a spring there as well. Is that factory? Im ordering new boots. Does anyone else have any ideas?
  • Re: carburetor fell off

    by » 9 years ago


    Hi Jay,

    Nice talking to you the other day.

    Rotax didn't have that 8mm spacer on the carb flange years ago and many over tightened the clamp which cuts the clamp on the inside and then the clamp is ruined and leaks. Almost all the time when a carb comes easily out of the flange it is because the owner does not push it in all the way until it kind of clips or snaps in place. The rubber flange has indentations inside that correspond to the protrusions on the carb throat. This must be pushed and almost forced back all the way until you feel the carb throat snap in place. This means the rubber flange is all the way against the carb body and no part of the carb throat is visible. If that carb that fell out came out without a struggle especially with it clamped in place you didn't have it pushed in near far enough.

    If that carb is pushed in all the way and clamped you will not be able to pull it out without some serious force which may damage the flange.

    I would put the clamp spacer back in place and seat the carb farther into the rubber flange. Failing to do this may allow the carb to come out eventually with vibration at a later time. Clamping the rubber flange without the spacer may cost you $115 for each new flange.

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


  • Re: carburetor fell off

    by » 9 years ago


    Roger, I just reinstalled the spacers. i cannot physically get the carbs seated any further into the sockets. However, with moderate pressure on the screw driver, I can turn the clamp around the carb socket. This seems to me to indicate a loose clamp. But with the spacer, it can't be tightened. I tried to force the carb off the socket by hand and was unable to do so, but the fact remains, the clamp is mobile. ideas, comments?

  • Re: carburetor fell off

    by » 9 years ago


    Hi Jay,

    Call me again and let's talk. I don't have your number.
    The clamp shouldn't turn and the carb many times needs to be "wiggled" into place. The rubber flange should be all the way against the carb body and none of the carb throat should be visible. If the carb is fully in place in the flange then the clamp will tighten and won't turn by hand.

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


  • Re: carburetor fell off

    by » 9 years ago


    I just replaced the carb sockets with new ones. the difference in security is amazing. I'm happy with it. but I am now seeing a tremendous amount of soot in the exhaust pipe. My carb balance didn't fix the problem so i took off the carbs to inspect the floats and the position of float arms. They look perfect. While they are off should I check anything else?

  • Re: carburetor fell off

    by » 9 years ago


    Jay,

    My exhaust appears sooty on the inside and always has done. If you are concerned about the mixture then check the colour of the spark plugs as that is likely to be a better gauge.

    Kevin

    Thank you said by: jay white

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