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912 mid range power problem912 mid range power problem

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Dick Maddux

Joined: 24 Jun 2008
Posts: 516
Location: Milton, Fl

Posted: Sun Oct 03, 2010 5:14 am Post subject: 912 mid range power problem912 mid range power problem

It sounds like one of your throttle cables could be slightly hanging up during power reduction. I had a similar problem with my 912Ul. I lubed the cables, that helped for a while but I finally ended up replacing them with new Teflon sleeved cables and that solved the problem.

  Also check the "swivel nuts" at the carb throttle arms for freedom of movement. If one sticks during movement this can also cause one carb to go momentarily out of sync.

                                                      

                                                               Dick Maddux

                                                               Fox 4

                                                               912 UL

                                                                Milton,Fl  

  [quote][b]

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Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Mon Oct 04, 2010 6:50 am Post subject: Re: 912 mid range power problem912 mid range power problem

I'm with Dick on this,



This does sound like a mechanical fuel delivery issue with the carbs. I doubt seriously it is with the jetting. 

Look for something else. The carbs on the 912 are set up just fine from the factory and shouldn't need any main jet changing or needle adjustment. Unless you know all the far reaching issues both short term and long term I would leave jetting in this case alone. I'm with Dick, look for some other explanation. You can check the carbs by one making sure they are balanced, but this time tie the plane down and run the throttle up to 5000 or until your gauges will no longer read. If you have an imbalance in fuel, actual carb imbalance or a throttle cable issue it will show up here and help diagnose your problem. Going in and just changing things to change them in the hopes of a fix isn't the right way. Many 912's have a slight roughness as they come down out of cruise to around the 3800-4000 rpm range. 



Unless you fly in very special circumstances all the time leave the jetting alone.

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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

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