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912 rough running below 3000 rpm

 
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flynn elliott



Joined: 23 Jun 2007
Posts: 20
Location: SOUTH AFRICA

PostPosted: Wed Jul 15, 2015 9:22 am    Post subject: 912 rough running below 3000 rpm Reply with quote

Hi Roger,and all who offered advice,
The rough running is now in the history books.
After cleaning the carbs yet again, blowing air around and through every
nook and cranny all over a white towel with no crud to be seen whatsoever, I
reassembeled the carbs with new jet 'o' rings etc. Put the carbs back on and
balanced with gauges then a borrowed Carbmate (which is fantastic to use)
Fired up the motor and to my great surprise my 912 was back to her old self,
smooth as silk.
I sooo wish we found some crapp in the carbs if only to tell me the problem
!!
Many many thanks for the help.
Flynn

--


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Roger Lee



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

PostPosted: Wed Jul 15, 2015 3:52 pm    Post subject: Re: 912 rough running below 3000 rpm Reply with quote

Hi Flynn,

Glad it worked out.

Sometimes when you clean the carbs the tiniest spec goes flying out and the eye never sees it. It may have been a passage that only had a partial obstruction to cause the roughness. It's happened to me. I have learned not to piecemeal everything and just bugle down and just the job top to bottom and 100% and that eliminates that as a potential problem. Over all it will take less time in the long run and be a lot less frustrating.


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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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rickofudall



Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

PostPosted: Thu Jul 16, 2015 7:11 pm    Post subject: 912 rough running below 3000 rpm Reply with quote

Congrats, Flynn,Just to be safe, stay within gliding distance of your field for the next couple of hours. A couple of years ago I had a piece of mystery crud come back to block the main jet. Not fun.
Safe skies,
Rick Girard
do not archive
On Wed, Jul 15, 2015 at 12:20 PM, Flynn Elliott <foxflynn(at)worldonline.co.za (foxflynn(at)worldonline.co.za)> wrote:
[quote]--> RotaxEngines-List message posted by: "Flynn Elliott" <foxflynn(at)worldonline.co.za (foxflynn(at)worldonline.co.za)>

Hi Roger,and all who offered advice,
The rough running is now in the history books.
After cleaning the carbs yet again, blowing air around and through every
nook and cranny all over a white towel with no crud to be seen whatsoever, I
reassembeled the carbs with new jet 'o' rings etc. Put the carbs back on and
balanced with gauges then a borrowed Carbmate (which is fantastic to use)
Fired up the motor and to my great surprise my 912 was back to her old self,
smooth as silk.
I sooo wish we found some crapp in the carbs if only to tell me the problem
!!
Many many thanks for the help.
Flynn









--


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flynn elliott



Joined: 23 Jun 2007
Posts: 20
Location: SOUTH AFRICA

PostPosted: Fri Jul 17, 2015 8:20 am    Post subject: 912 rough running below 3000 rpm Reply with quote

Thanks Rick,
I fully hear what you say, and have now put just on two happy hours with eyes and ears on full standby, although I have to say the problem was never at cruise rpm, but good advice for anyone to take onboard.
Keep well
Flynn

From: owner-rotaxengines-list-server(at)matronics.com [mailto:owner-rotaxengines-list-server(at)matronics.com] On Behalf Of Richard Girard
Sent: 17 July 2015 05:10 AM
To: rotaxengines-list(at)matronics.com
Subject: Re: Re: 912 rough running below 3000 rpm


Congrats, Flynn,
Just to be safe, stay within gliding distance of your field for the next couple of hours. A couple of years ago I had a piece of mystery crud come back to block the main jet. Not fun.



Safe skies,

Rick Girard

do not archive

On Wed, Jul 15, 2015 at 12:20 PM, Flynn Elliott <foxflynn(at)worldonline.co.za (foxflynn(at)worldonline.co.za)> wrote:
--> RotaxEngines-List message posted by: "Flynn Elliott" <foxflynn(at)worldonline.co.za (foxflynn(at)worldonline.co.za)>

Hi Roger,and all who offered advice,
The rough running is now in the history books.
After cleaning the carbs yet again, blowing air around and through every
nook and cranny all over a white towel with no crud to be seen whatsoever, I
reassembeled the carbs with new jet 'o' rings etc. Put the carbs back on and
balanced with gauges then a borrowed Carbmate (which is fantastic to use)
Fired up the motor and to my great surprise my 912 was back to her old self,
smooth as silk.
I sooo wish we found some crapp in the carbs if only to tell me the problem
!!
Many many thanks for the help.
Flynn

--


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BARRY CHECK 6



Joined: 15 Mar 2011
Posts: 738

PostPosted: Fri Jul 17, 2015 10:04 am    Post subject: 912 rough running below 3000 rpm Reply with quote

If safety was his concern he would not be flying a Rotax!
I am at a loss for words.  I just do not understand why you guys are so loyal to an engine that has so many problems and poor designs.  I read the Lycoming, Continental, Jabaru, Subaru, and WV sites, they do not have the ridiculous problems that Rotax does, and when a problem does surface they fix it by eliminating it.  Not by living with it!  

On Thursday, July 16, 2015, Richard Girard <aslsa.rng(at)gmail.com> wrote:
[quote]Congrats, Flynn,Just to be safe, stay within gliding distance of your field for the next couple of hours. A couple of years ago I had a piece of mystery crud come back to block the main jet. Not fun.
Safe skies,
Rick Girard
do not archive
On Wed, Jul 15, 2015 at 12:20 PM, Flynn Elliott <foxflynn(at)worldonline.co.za> wrote:
[quote]--> RotaxEngines-List message posted by: "Flynn Elliott" <foxflynn(at)worldonline.co.za>

Hi Roger,and all who offered advice,
The rough running is now in the history books.
After cleaning the carbs yet again, blowing air around and through every
nook and cranny all over a white towel with no crud to be seen whatsoever, I
reassembeled the carbs with new jet 'o' rings etc. Put the carbs back on and
balanced with gauges then a borrowed Carbmate (which is fantastic to use)
Fired up the motor and to my great surprise my 912 was back to her old self,
smooth as silk.
I sooo wish we found some crapp in the carbs if only to tell me the problem
!!
Many many thanks for the help.
Flynn









--


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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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daberti(at)sbcglobal.net
Guest





PostPosted: Fri Jul 17, 2015 10:36 am    Post subject: 912 rough running below 3000 rpm Reply with quote

We all do it just to give you something to read about...

On 7/17/2015 1:03 PM, FLYaDIVE wrote:

[quote] If safety was his concern he would not be flying a Rotax!


I am at a loss for words.  I just do not understand why you guys are so loyal to an engine that has so many problems and poor designs.  I read the Lycoming, Continental, Jabaru, Subaru, and WV sites, they do not have the ridiculous problems that Rotax does, and when a problem does surface they fix it by eliminating it.  Not by living with it!  

On Thursday, July 16, 2015, Richard Girard <aslsa.rng(at)gmail.com> wrote:
[quote] Congrats, Flynn, Just to be safe, stay within gliding distance of your field for the next couple of hours. A couple of years ago I had a piece of mystery crud come back to block the main jet. Not fun.


Safe skies,
Rick Girard
do not archive


On Wed, Jul 15, 2015 at 12:20 PM, Flynn Elliott <foxflynn(at)worldonline.co.za> wrote:
[quote]--> RotaxEngines-List message posted by: "Flynn Elliott" <foxflynn(at)worldonline.co.za>

Hi Roger,and all who offered advice,
The rough running is now in the history books.
After cleaning the carbs yet again, blowing air around and through every
nook and cranny all over a white towel with no crud to be seen whatsoever, I
reassembeled the carbs with new jet 'o' rings etc. Put the carbs back on and
balanced with gauges then a borrowed Carbmate (which is fantastic to use)
Fired up the motor and to my great surprise my 912 was back to her old self,
smooth as silk.
I sooo wish we found some crapp in the carbs if only to tell me the problem
!!
Many many thanks for the help.
Flynn









--


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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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svanarts



Joined: 03 Feb 2011
Posts: 2
Location: Modesto, CA

PostPosted: Fri Jul 17, 2015 10:59 am    Post subject: 912 rough running below 3000 rpm Reply with quote

I haven't had any issues with my Rotax 912ULS.  It's been dependable for me.

On Fri, Jul 17, 2015 at 11:03 AM, FLYaDIVE <flyadive(at)gmail.com (flyadive(at)gmail.com)> wrote:
[quote]If safety was his concern he would not be flying a Rotax!
I am at a loss for words.  I just do not understand why you guys are so loyal to an engine that has so many problems and poor designs.  I read the Lycoming, Continental, Jabaru, Subaru, and WV sites, they do not have the ridiculous problems that Rotax does, and when a problem does surface they fix it by eliminating it.  Not by living with it!  

On Thursday, July 16, 2015, Richard Girard <aslsa.rng(at)gmail.com> wrote:
[quote]Congrats, Flynn,Just to be safe, stay within gliding distance of your field for the next couple of hours. A couple of years ago I had a piece of mystery crud come back to block the main jet. Not fun.
Safe skies,
Rick Girard
do not archive
On Wed, Jul 15, 2015 at 12:20 PM, Flynn Elliott <foxflynn(at)worldonline.co.za> wrote:
[quote]--> RotaxEngines-List message posted by: "Flynn Elliott" <foxflynn(at)worldonline.co.za>

Hi Roger,and all who offered advice,
The rough running is now in the history books.
After cleaning the carbs yet again, blowing air around and through every
nook and cranny all over a white towel with no crud to be seen whatsoever, I
reassembeled the carbs with new jet 'o' rings etc. Put the carbs back on and
balanced with gauges then a borrowed Carbmate (which is fantastic to use)
Fired up the motor and to my great surprise my 912 was back to her old self,
smooth as silk.
I sooo wish we found some crapp in the carbs if only to tell me the problem
!!
Many many thanks for the help.
Flynn









--


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flynn elliott



Joined: 23 Jun 2007
Posts: 20
Location: SOUTH AFRICA

PostPosted: Fri Jul 17, 2015 11:28 am    Post subject: 912 rough running below 3000 rpm Reply with quote

If the “he” you refer to having no concern for safety is actually “me” then I would seriously take you to task !!  Nine years behind a well serviced Rotax and the first issue is fuel contamination ( read speck of crud in the carb)
By the way what Jabiru site do you read ?
Been there , got the T shirt, Two rebuilds in under 40 hrs !
If you were not referring to me then have a nice day.
Flynn

From: owner-rotaxengines-list-server(at)matronics.com [mailto:owner-rotaxengines-list-server(at)matronics.com] On Behalf Of FLYaDIVE
Sent: 17 July 2015 08:04 PM
To: rotaxengines-list(at)matronics.com
Subject: RE: Re: 912 rough running below 3000 rpm


If safety was his concern he would not be flying a Rotax!



I am at a loss for words. I just do not understand why you guys are so loyal to an engine that has so many problems and poor designs. I read the Lycoming, Continental, Jabaru, Subaru, and WV sites, they do not have the ridiculous problems that Rotax does, and when a problem does surface they fix it by eliminating it. Not by living with it!

On Thursday, July 16, 2015, Richard Girard <aslsa.rng(at)gmail.com (aslsa.rng(at)gmail.com)> wrote:
Congrats, Flynn,
Just to be safe, stay within gliding distance of your field for the next couple of hours. A couple of years ago I had a piece of mystery crud come back to block the main jet. Not fun.



Safe skies,

Rick Girard

do not archive

On Wed, Jul 15, 2015 at 12:20 PM, Flynn Elliott <foxflynn(at)worldonline.co.za (foxflynn(at)worldonline.co.za)> wrote:
--> RotaxEngines-List message posted by: "Flynn Elliott" <foxflynn(at)worldonline.co.za (foxflynn(at)worldonline.co.za)>

Hi Roger,and all who offered advice,
The rough running is now in the history books.
After cleaning the carbs yet again, blowing air around and through every
nook and cranny all over a white towel with no crud to be seen whatsoever, I
reassembeled the carbs with new jet 'o' rings etc. Put the carbs back on and
balanced with gauges then a borrowed Carbmate (which is fantastic to use)
Fired up the motor and to my great surprise my 912 was back to her old self,
smooth as silk.
I sooo wish we found some crapp in the carbs if only to tell me the problem
!!
Many many thanks for the help.
Flynn

--


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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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lcfitt3(at)gmail.com
Guest





PostPosted: Fri Jul 17, 2015 2:53 pm    Post subject: 912 rough running below 3000 rpm Reply with quote

FLYaDive,
I just read your post relaxing with my phone then lunged at my computer. True story. When I was building my first airplane in the late 90s, a friend started his as well. We were pretty much on a parallel course. Like you, he was concerned about the abundance of service letters and bulletins from Rotax, so he opted for a Subaru EA-81 which was then supported by our kit plane factory. The Subaru conversion company was completely, read COMPLETELY, silent on anything at all and that gave him great comfort. I stayed with my gut feelings and went 912. I first flew in 1998 and subsequently put 900 hours on mine. To this date, he has less than 40 on his and it has been up for sale for at least ten years with no takers. I also have a very good friend who flies behind a Jabaru. I have helped him with some issues. The inside of his lower cowl looks like a catch basin for an oil change bay. He has had one overhaul in less than 400 hours and now no longer has to re-torque the head bolts after every flight, but still adds oil after every flight. Neither of these guys have ever been on any type of email list or forum.

If you really feel that no news is good news, then good luck to you.
Lowell Fitt
From: FLYaDIVE (flyadive(at)gmail.com)
Sent: Friday, July 17, 2015 11:03 AM
To: rotaxengines-list(at)matronics.com (rotaxengines-list(at)matronics.com)
Subject: RE: Re: 912 rough running below 3000 rpm


If safety was his concern he would not be flying a Rotax!


I am at a loss for words. I just do not understand why you guys are so loyal to an engine that has so many problems and poor designs. I read the Lycoming, Continental, Jabaru, Subaru, and WV sites, they do not have the ridiculous problems that Rotax does, and when a problem does surface they fix it by eliminating it. Not by living with it!

On Thursday, July 16, 2015, Richard Girard <aslsa.rng(at)gmail.com> wrote:
Quote:
Congrats, Flynn, Just to be safe, stay within gliding distance of your field for the next couple of hours. A couple of years ago I had a piece of mystery crud come back to block the main jet. Not fun.


Safe skies,
Rick Girard
do not archive


On Wed, Jul 15, 2015 at 12:20 PM, Flynn Elliott <foxflynn(at)worldonline.co.za> wrote:
Quote:
--> RotaxEngines-List message posted by: "Flynn Elliott" <foxflynn(at)worldonline.co.za>

Hi Roger,and all who offered advice,
The rough running is now in the history books.
After cleaning the carbs yet again, blowing air around and through every
nook and cranny all over a white towel with no crud to be seen whatsoever, I
reassembeled the carbs with new jet 'o' rings etc. Put the carbs back on and
balanced with gauges then a borrowed Carbmate (which is fantastic to use)
Fired up the motor and to my great surprise my 912 was back to her old self,
smooth as silk.
I sooo wish we found some crapp in the carbs if only to tell me the problem
!!
Many many thanks for the help.
Flynn

-----Original Message-----
From: owner-rotaxengines-list-server(at)matronics.com
[mailto:owner-rotaxengines-list-server(at)matronics.com] On Behalf Of Roger Lee
Sent: 03 June 2015 04:01 PM
To: rotaxengines-list(at)matronics.com
Subject: Re: 912 rough running below 3000 rpm

--> RotaxEngines-List message posted by: "Roger Lee" <ssadiver1(at)yahoo.com>

Hi Flynn,

The carb must be off the engine and held upside down. Take a MM ruler and
stand it upright (straight up) on the outside lip of the carb. Now slide it
over towards the float armature so you can see the ruler marks next to the
float armature. The top of the float armature should be 10.5mm. If it is not
just bend the tab where the float needle is suspended to obtain the proper
10.5mm height. This is what controls the fuel level in the bowl as the
floats push up against it. If it is off adjustment it can cause some
flooding and rough running.

--------
Roger Lee
Tucson, Az.
Rotax Instructor &amp; Rotax IRC
Light Sport Repairman
Home [url=tel:520-574-1080]520-574-1080[/url] TRY HOME FIRST
Cell [url=tel:520-349-7056]520-349-7056[/url]


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=442934#442934


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peteohms



Joined: 31 Oct 2007
Posts: 224
Location: Leander, TX

PostPosted: Sun Jul 19, 2015 5:38 am    Post subject: 912 rough running below 3000 rpm Reply with quote

A story about a Jabiru engine failure here: http://www.craigr.com/2011/11/09/forced-landing-in-the-jabiru/
"The second unexpected response was the disappearance of confidence I have in the Jabiru engine. This was actually the second engine failure we’ve had. The first engine lasted about 60 hours before a piston failed. My dad discovered that problem while taking off one day. The engine just didn’t seem right, so he aborted his take-off just before lifting off. The replacement engine they sent us had experienced the same problem during its initial testing after being mounted on a new airplane. They replaced the engine on that airplane, then replaced the failed piston in the bad engine and sent it to us. They assured us the replacement was like new, but then our last “new engine” (which really was new) had failed after only 60 hours. So we’ve owned two Jabiru engines: One that failed catastrophically after 60 hours, and one that failed catastrophically after 2.5 hours and again after 480 hours. That’s an average of 180 hours between catastrophic failures. At that rate we can expect a forced landing in a cow pasture every 18 months. It’s difficult to imagine what they can do to turn what appears to be a problem engine into one in which I can have confidence."
On Jul 17, 2015, at 5:52 PM, Lowell Fitt <lcfitt3(at)gmail.com (lcfitt3(at)gmail.com)> wrote:
[quote] FLYaDive,
I just read your post relaxing with my phone then lunged at my computer. True story. When I was building my first airplane in the late 90s, a friend started his as well. We were pretty much on a parallel course. Like you, he was concerned about the abundance of service letters and bulletins from Rotax, so he opted for a Subaru EA-81 which was then supported by our kit plane factory. The Subaru conversion company was completely, read COMPLETELY, silent on anything at all and that gave him great comfort. I stayed with my gut feelings and went 912. I first flew in 1998 and subsequently put 900 hours on mine. To this date, he has less than 40 on his and it has been up for sale for at least ten years with no takers. I also have a very good friend who flies behind a Jabaru. I have helped him with some issues. The inside of his lower cowl looks like a catch basin for an oil change bay. He has had one overhaul in less than 400 hours and now no longer has to re-torque the head bolts after every flight, but still adds oil after every flight. Neither of these guys have ever been on any type of email list or forum.

If you really feel that no news is good news, then good luck to you.
Lowell Fitt
From: FLYaDIVE (flyadive(at)gmail.com)
Sent: Friday, July 17, 2015 11:03 AM
To: rotaxengines-list(at)matronics.com (rotaxengines-list(at)matronics.com)
Subject: RE: Re: 912 rough running below 3000 rpm


If safety was his concern he would not be flying a Rotax!


I am at a loss for words. I just do not understand why you guys are so loyal to an engine that has so many problems and poor designs. I read the Lycoming, Continental, Jabaru, Subaru, and WV sites, they do not have the ridiculous problems that Rotax does, and when a problem does surface they fix it by eliminating it. Not by living with it!

On Thursday, July 16, 2015, Richard Girard <aslsa.rng(at)gmail.com> wrote:
Quote:
Congrats, Flynn, Just to be safe, stay within gliding distance of your field for the next couple of hours. A couple of years ago I had a piece of mystery crud come back to block the main jet. Not fun.


Safe skies,
Rick Girard
do not archive


On Wed, Jul 15, 2015 at 12:20 PM, Flynn Elliott <foxflynn(at)worldonline.co.za> wrote:
Quote:
--> RotaxEngines-List message posted by: "Flynn Elliott" <foxflynn(at)worldonline.co.za>

Hi Roger,and all who offered advice,
The rough running is now in the history books.
After cleaning the carbs yet again, blowing air around and through every
nook and cranny all over a white towel with no crud to be seen whatsoever, I
reassembeled the carbs with new jet 'o' rings etc. Put the carbs back on and
balanced with gauges then a borrowed Carbmate (which is fantastic to use)
Fired up the motor and to my great surprise my 912 was back to her old self,
smooth as silk.
I sooo wish we found some crapp in the carbs if only to tell me the problem
!!
Many many thanks for the help.
Flynn

-----Original Message-----
From: owner-rotaxengines-list-server(at)matronics.com
[mailto:owner-rotaxengines-list-server(at)matronics.com] On Behalf Of Roger Lee
Sent: 03 June 2015 04:01 PM
To: rotaxengines-list(at)matronics.com
Subject: Re: 912 rough running below 3000 rpm

--> RotaxEngines-List message posted by: "Roger Lee" <ssadiver1(at)yahoo.com>

Hi Flynn,

The carb must be off the engine and held upside down. Take a MM ruler and
stand it upright (straight up) on the outside lip of the carb. Now slide it
over towards the float armature so you can see the ruler marks next to the
float armature. The top of the float armature should be 10.5mm. If it is not
just bend the tab where the float needle is suspended to obtain the proper
10.5mm height. This is what controls the fuel level in the bowl as the
floats push up against it. If it is off adjustment it can cause some
flooding and rough running.

--------
Roger Lee
Tucson, Az.
Rotax Instructor &amp; Rotax IRC
Light Sport Repairman
Home [url=tel:520-574-1080]520-574-1080[/url] TRY HOME FIRST
Cell [url=tel:520-349-7056]520-349-7056[/url]


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=442934#442934


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