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Running rough

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rexjan(at)bigpond.com
Guest

Posted: Thu Oct 26, 2006 7:49 pm Post subject: Running rough

Time: 11:13:47  AM PST US

From: Kaufjm(at)AOL.COM (Kaufjm(at)AOL.COM)

Subject: Electrical question

I  am having a problem with my 912ULS running rough. I've been every where,   

checked for broken wires on my ignition modules, coils everything I can  think 

of. I've been through the carbs as well. I did find something on  my  ignition 

switch that was supplied with the engine kit.   It's  the A-510-2 keyed 

left-right-starter switch. There is a jumper  that's  on terminal 1. Going back

over 

the instructions it says  jumper used with impulse  coupling. I assume that is 

what the 912  has... The other thing is there is  no ground wire to the switch 

as  indicated by the instructions, Could this  cause a  problem?

 Thanks!

 I just fixed this exact same problem in my mates  KR2 with a Revmaster VW motor and the A-510 ignition switch. The fault came back  to the switch. I happened to have a new one I was not using at the time and we  swapped it over.All the problems dissapeared. So I pulled the old switch apart  to figure out why. On the inside/backside of the terminal plate there was a  heavy carbon track. I meant to measure this first but forgot and started to  clean it. I wish I had measured it because it seemed strange this was  causing the problem. Anyway I did measure across the terminals after cleaning  and there was no leakage so I think the switch would be OK now but my mate  prefered not to change it back. I think if you remove the two screws holding the  plate on and clean it and the little dimpled contacts that wipe across the  terminals you might well solve your problem. Watch the springs under the  triangular contacts.

   Now a word about that carbon track. I think  it may have been partly made up by some lubricant used. It is good idea to use  something after cleaning. I just usted Clean and Lube spray and I figure this  would be OK. We don't actually know though because as I said we didn't reuse  this switch at this point in time, instead it is my mates spares  box.

   I hope this solves your  problem.

                                                               Rex.

   [quote][b]

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marwynne(at)verizon.net
Guest

Posted: Fri Oct 27, 2006 4:40 am Post subject: Running rough

I had two problems with engine running rough.



I had a whole in one of the carbs  diaphragm.  This problem caused the 

engine to run rough all the time. 



The other was one of the wires on the electronic modules  was  broken.  

This was an  interment  problem.





Rex Shaw wrote:

 	  Quote: 	
		   Time: 11:13:47 AM PST US

 From: Kaufjm(at)AOL.COM <mailto:Kaufjm(at)AOL.COM>

 Subject: Electrical question



 I am having a problem with my 912ULS running rough. I've been every 

 where, 

 checked for broken wires on my ignition modules, coils everything I 

 can think



 of. I've been through the carbs as well. I did find something on my  

 ignition

 switch that was supplied with the engine kit.  It's  the A-510-2 keyed

 left-right-starter switch. There is a jumper that's  on terminal 1. 

 Going back

 over

 the instructions it says jumper used with impulse  coupling. I assume 

 that is

 what the 912 has... The other thing is there is  no ground wire to the 

 switch

 as indicated by the instructions, Could this  cause a problem?

  Thanks!

 I just fixed this exact same problem in my mates KR2 with a Revmaster 

 VW motor and the A-510 ignition switch. The fault came back to the 

 switch. I happened to have a new one I was not using at the time and 

 we swapped it over.All the problems dissapeared. So I pulled the old 

 switch apart to figure out why. On the inside/backside of the terminal 

 plate there was a heavy carbon track. I meant to measure this first 

 but forgot and started to clean it. I wish I had measured it because 

 it seemed strange this was causing the problem. Anyway I did measure 

 across the terminals after cleaning and there was no leakage so I 

 think the switch would be OK now but my mate prefered not to change it 

 back. I think if you remove the two screws holding the plate on and 

 clean it and the little dimpled contacts that wipe across the 

 terminals you might well solve your problem. Watch the springs under 

 the triangular contacts.

   Now a word about that carbon track. I think it may have been partly 

 made up by some lubricant used. It is good idea to use something after 

 cleaning. I just usted Clean and Lube spray and I figure this would be 

 OK. We don't actually know though because as I said we didn't reuse 

 this switch at this point in time, instead it is my mates spares box.

   I hope this solves your problem.

                                                              Rex.

 *

 *

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torgemor(at)online.no
Guest

Posted: Fri Oct 27, 2006 1:22 pm Post subject: Running rough

Just a note here.



There is no (traditional) magneto on the 912UL (or ULS version).



The jumper installed in your switch is to be removed!!



The purpose of this jumper is to ground the right magneto during startup.



In standard aircraft with Lycoming or Continental etc., there is a little  

device installed on the left magneto -the impulse device. This device  

makes the left magneto "spin" faster every time it's "trigged" during  

startup. In addition the ignite point is advanced during start up. In this  

sequence of the start, the right magneto is grounded when the starting  

switch is turned to start position.  This is just the same we do in â€œolder  

manual startâ€ procedure, when starting with only left magneto on (remember  

left magneto have the impulse), when the engine start the right magneto is  

to be switched on.



So again, the Rotax 912 do not have this kind of ignition system.



Can't see any reason to ground your right ignition during start up.



Just remove this wire.



Try to explain a little more about the engine behavior during run, does it  

run rough in the entire "RPM" band -or?  At high and low RPM?



Again, a detailed description of the engines behavior and everything that  

you have observed.

Good luck.

Torgeir.



On Fri, 27 Oct 2006 22:18:53 +0200, Rex Shaw <rexjan(at)bigpond.com> wrote:



 	  Quote: 	
		   Time: 11:13:47 AM PST US

 From: Kaufjm(at)AOL.COM

 Subject: Electrical question



 I am having a problem with my 912ULS running rough. I've been every  

 where,

 checked for broken wires on my ignition modules, coils everything I can  

 think



 of. I've been through the carbs as well. I did find something on my   

 ignition

 switch that was supplied with the engine kit.  It's  the A-510-2 keyed

 left-right-starter switch. There is a jumper that's  on terminal 1.  

 Going back

 over

 the instructions it says jumper used with impulse  coupling. I assume  

 that is

 what the 912 has... The other thing is there is  no ground wire to the  

 switch

 as indicated by the instructions, Could this  cause a problem?

  Thanks!



 I just fixed this exact same problem in my mates KR2 with a Revmaster VW  

 motor and the A-510 ignition switch. The fault came back to the switch.  

 I happened to have a new one I was not using at the time and we swapped  

 it over.All the problems dissapeared. So I pulled the old switch apart  

 to figure out why. On the inside/backside of the terminal plate there  

 was a heavy carbon track. I meant to measure this first but forgot and  

 started to clean it. I wish I had measured it because it seemed strange  

 this was causing the problem. Anyway I did measure across the terminals  

 after cleaning and there was no leakage so I think the switch would be  

 OK now but my mate prefered not to change it back. I think if you remove  

 the two screws holding the plate on and clean it and the little dimpled  

 contacts that wipe across the terminals you might well solve your  

 problem. Watch the springs under the triangular contacts.

   Now a word about that carbon track. I think it may have been partly  

 made up by some lubricant used. It is good idea to use something after  

 cleaning. I just usted Clean and Lube spray and I figure this would be  

 OK. We don't actually know though because as I said we didn't reuse this  

 switch at this point in time, instead it is my mates spares box.

   I hope this solves your problem.

                                                              Rex.


	


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Kaufjm(at)aol.com
Guest

Posted: Fri Oct 27, 2006 9:30 pm Post subject: Running rough

Thanks for your response, The engine runs rough at idle and up through full  throttle but not as noticeable at the higher RPM. The synchronization is ok, I  sent the redrive out and the carbs cleaned by a Rotax shop, I checked all  the wires on the electronic ignition for continuity and now I am checking spark  plug wires and contacts, cleaning and spraying with electronic cleaner. 

  THANKS! 

   Jon

Just a note here.



There is no (traditional) magneto on  the 912UL (or ULS version).



The jumper installed in your switch is to be  removed!!



The purpose of this jumper is to ground the right magneto  during startup.



In standard aircraft with Lycoming or Continental etc.,  there is a little  

device installed on the left magneto -the impulse  device. This device  

makes the left magneto "spin" faster every time  it's "trigged" during  

startup. In addition the ignite point is  advanced during start up. In this  

sequence of the start, the right  magneto is grounded when the starting  

switch is turned to start  position.  This is just the same we do in â€œolder  

manual startâ€  procedure, when starting with only left magneto on (remember  

left  magneto have the impulse), when the engine start the right magneto is   

to be switched on.



So again, the Rotax 912 do not have this kind of  ignition system.



Can't see any reason to ground your right ignition  during start up.



Just remove this wire.



Try to explain a little  more about the engine behavior during run, does it  

run rough in the  entire "RPM" band -or?  At high and low RPM?



Again, a detailed  description of the engines behavior and everything that  

you have  observed.

Good luck.



  [quote][b]

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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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