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Wings Forum • View topic - Rotax 912ULS

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 Post subject: Rotax 912ULS
PostPosted: Sat Jun 13, 2009 7:14 pm 
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PostPosted: Sat Jun 13, 2009 9:02 pm 
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PostPosted: Sat Jun 13, 2009 9:13 pm 
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PostPosted: Sun Jun 14, 2009 9:55 am 
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I would suspect the carbs are not balanced at the high range. This can be caused by slight cable tension at different throttle positions. Also check your right crab to be sure that the throttle cable end is not hitting the fuel lines running up to you fuel pump which can interfere with your throttle throw. If the carbs are out of sink with each other the resulting engine vibration can shake the fuel out of the float periodically.

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 Post subject: 912 Rotax
PostPosted: Mon Jun 15, 2009 9:44 am 
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Thanks Lynn, Dennis, and others:
Lynn, did you balance your carbs at idle with the vaccum guages, or did you use some other method?
R.S.


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PostPosted: Mon Jun 15, 2009 9:59 am 
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I balanced mine using the gauges I bought from Aircraft Spruce for the Rotax 912uls.  They work great.  Easy to do with TWO people.  One holding the gauges and one inside the plane.  I also viewed the How To video on the Rotax Owner website.  I also have the Rotax installation video I bought that was a great help in setting up the engine in the plane.  
Dennis

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PostPosted: Tue Jun 16, 2009 7:19 pm 
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I balanced my carbs at idle and also checked how well they stayed together thru 4500 rpm. CHOCK the airplane or tie it down and use 2 people.

Lynn :D

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PostPosted: Wed Jun 17, 2009 8:18 am 
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Closely inspect the braided-steel covered leads coming from the stator area (pickup coils) to the CDI boxes.  These can fray and short to the motor mount, or pull loose on one or both ends under torque (higher power setting).  They need some slack to allow for motor movement on the mount.

Had that problem with a 912UL.

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 Post subject: Rotax 912 ULS
PostPosted: Wed Jun 17, 2009 7:22 pm 
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Thanks to all:
Roger


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PostPosted: Thu Jun 18, 2009 11:51 am 
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Does anyone have any experience with this soft start module from Bully Hawk.com for the 912/914?  Suppose to eliminate kick back during startup. http://www.bullyhawk.com/

Steve


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PostPosted: Thu Jun 18, 2009 9:27 pm 
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Steve,

There was a discussion on this just a couple of weeks ago.  There is also a video on the R.O.A.N. website.  I'm not aware of anyone using one as of yet.

Paul, PA

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PostPosted: Fri Jun 19, 2009 12:38 am 
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thanks Paul, I missed that discussion

Steve


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 Post subject: Re: Rotax 912ULS
PostPosted: Thu Feb 18, 2010 10:34 am 
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Hi Roger
www.boehm-synchrontester.de is a German producer of synchronizers. He sells its products all over the world.
I think he is the only one who can offer the tester with a Capsule pressure gauge and Zero adjustment.
Scale range from 0....600 mbar; equal 0...17.7 mercury vacuum. A dampening system will avoid vibration of the needle.
There you get a lot of informations about synchronizing carbs.
Manfred


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