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Here is a post from another site and a very good reason to do your Rotax 5 year rubber replacement. Oil, fuel, coolant hoses, Carb sockets, carb diaphragms. Not dependent on hours, but time in service. Ozone, constant heating and cooling ruin rubber parts. :

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Here is a picture of a carb flange I had removed off of a 2006 Stingsport last month. The customer was having starting issues for awhile and had figured a carb balance would help. After attaching the the carb balancer, the engine started to shake and overflow during the test run. Upon further inspection we had found that by removing the support spring on the top of the carb and compensation tube, we were allowing the crack in the flange to open enough to cause a massive vacuum leak. The carb flange removed was a PN- 267-788, all the new ones in the last few years have been the 267-789 which are beefed up a bit. We replaced both the flanges, fortunately his 5yr is due in a few months so it was an inevitable expense. This is a good reason why to take the time limits for parts seriously and ensure that you give these guys a good inspection during your annual.
Crackedcarbsocket.jpg (You do not have access to download this file.)

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

  • Re: Cracked carb socket

    by » 13 years ago


    Hi rodger. I didnt think we had a choice?

  • Re: Cracked carb socket

    by » 13 years ago


    Hi Steve,

    If you have a certified engine or a US Special Light Sport you don't have a choice, but many are experimental and they can do as they wish, but not doing it at times just brings high expense and heartache. Some things are better just getting done and not trying to save a few pennies as the long run cost and consequences are worse.I don't like spending money just like the rest, but it's part of aircraft ownership. The majority by a long shot are all pilot errors, why join that club.

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


  • Re: Cracked carb socket

    by » 13 years ago


    My 912 Rotax Carb Sockets never lasted more than a year......Many members in my club are experiencing the same problem and if you read other UL Forums, there are a lot of people complaining about the same.

    I dont want to start a brand debate or a issue about using aftermarket part but all of the members in my club including me, are using JBM Industries 912 Carb Sockets and they are 100% better than the Rotax ones.

    I hope Rotax take notice of this issue and use better quality materials on there Carbs Sockets.

    Isaac

    Here are some pics of my Rotax ones.
    Rotax912CarburatorSocket1.JPG (You do not have access to download this file.)
    Rotax912CarburatorSocketA.JPG (You do not have access to download this file.)

  • Re: Cracked carb socket

    by » 13 years ago


    Isaac

    I had the same problem with my 912s and my 582. Was replacing sockets every year. I put JBM sockets on both engines three years ago and they look like new today. Both engines are open installations and subject to UV deterioration but the sockets are in good condition.

    Bill.

  • Re: Cracked carb socket

    by » 13 years ago


    Hi Issac,

    It isn't the carb sockets having an issue. It is poor or no carb syncs, poor prop balance, old or poor engine mounts. What do all these have in common, vibration. Vibration is caused by just a few items normally that could have and should have been addressed during the regular maint. cycle. Over tightening of the carb mounting screw is another big killer. This all goes back to the the installation manual and then after that following the regular maint. manual and schedules. Most of the Rotax owners may go 10 years and more before having any issue, although they shouldn't and should be replaced at 5 year intervals. Most people never pull these off and won't know there is even a crack until the engine has an issue or they put a carb into the prop. Making a carb socket out of harder rubber isn't the solution, it just puts a band-aid over the real problem. If your friends are having carb sockets crack in a year then find what's causing the problem.

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


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