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                           RotaxEngines-List Digest Archive
                                      ---
                     Total Messages Posted Sat 11/18/06: 5
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Today's Message Index:
----------------------
 
     1. 05:54 AM - Re: 912UL rough at around 4000  (Thom Riddle)
     2. 07:41 AM - Re: 912UL rough at around 4000  (lostpilot28)
     3. 09:49 AM - Re: RotaxEngines-List Digest: 1 Msgs - 11/17/06  (Fergus Kyle)
     4. 07:07 PM - ROTAX 914 #1 plug  (Fergus Kyle)
     5. 09:02 PM - Re: ROTAX 914 #1 plug  ()
 
 
 
________________________________  Message 1  _____________________________________


Time: 05:54:39 AM PST US
From: Thom Riddle <jtriddle@adelphia.net>
Subject: Re: RotaxEngines-List: 912UL rough at around 4000


lostpilot28,

....Today I pulled the plugs & all were white except the #1 cylinder, 
which is always
      black for some reason.....

I experienced the sooty #1 plugs earlier this year on our 912UL but the 
rest were nice tan color and the carbs did not need to be leaned out, 
as yours did, although I took them both apart, checked the jets and 
needle numbers and the needle settings, which were all correct. The 
engine was not running rough either.

It took me quite a while to discover the problem but I finally did. One 
of the small gauge white ignition circuit wires was broken. I found it 
by visually inspecting every inch of the exposed wires. I don't recall 
which one but it apparently was affecting this cylinder only. Once I 
found and repaired the broken wire the plugs no longer turned black and 
were very close to the same rich/lean color as the rest.

Good luck.

Thom in Buffalo


________________________________  Message 2  _____________________________________


Time: 07:41:16 AM PST US
Subject: RotaxEngines-List: Re: 912UL rough at around 4000
From: "lostpilot28" <lostpilot28@yahoo.com>


Hi Thom,
Thanks for the tip! I'm going to go check out my wiring today.  It sounds like
the same thing that's happening to me...can you tell me the location of the broken
wire?  I'll start there just in case I get lucky.  Thanks again.

Regards,
Sonny


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=75425#75425


________________________________  Message 3  _____________________________________


Time: 09:49:04 AM PST US
From: "Fergus Kyle" <VE3LVO@rac.ca>
Subject: RotaxEngines-List: Re: RotaxEngines-List Digest: 1 Msgs - 11/17/06


.......and thank you, Sonny, for passing this on!
Ferg Kyle
Europa A064 914 Classic

| Today's Message Index|
|     1. 04:39 PM - Re: 912UL rough at around 4000  (lostpilot28)
Message 1  _____________________________________
| Time: 04:39:30 PM PST US
| Subject: RotaxEngines-List: Re: 912UL rough at around 4000
| From: "lostpilot28" <lostpilot28@yahoo.com>
|
| Problem resolved.  I spoke with a Bing guy earlier in the week who said 
the jets
| were worn and it was running too rich.  He was wrong.
|
| Today I pulled the plugs & all were white except the #1 cylinder, which is 
always
| black for some reason.  Majority rules - it's running lean.  I called Bing
| back from the airport and a different guy said a good way to test if it's 
too
| lean is to actuate the choke when it's running rough.  If it's too lean, 
this
| will richen the mixture and smooth it out.  He was right. I tried this 
while flying
| and it jumped up about 150 RPMs and smoothed out.
|
| I landed, moved the clip on the needle from the #2 position to the richer 
#3 position
| and went flying again.  Smooth as silk.  Thanks to those of you that 
provided
| feedback...your help was greatly appreciated!
|
| Regards,
| Sonny W.

| Read this topic online here:
| http://forums.matronics.com/viewtopic.php?p=75354#75354
| 


________________________________  Message 4  _____________________________________


Time: 07:07:46 PM PST US
From: "Fergus Kyle" <VE3LVO@rac.ca>
Subject: RotaxEngines-List: ROTAX 914 #1 plug


 To Sonny lostpilot28@yahoo.com  and all:
            I enjoyed reading your message and wonder why #1 cylinder plug 
is always black?
Ferg Kyle
Europa A064 914 Classic 


________________________________  Message 5  _____________________________________


Time: 09:02:34 PM PST US
Subject: Re: RotaxEngines-List: ROTAX 914 #1 plug
From: <rparigor@suffolk.lib.ny.us>


Hello Ferg

"wonder why #1 cylinder plug  is always black?"

Supposedly below 5000RPM the manifold shape causes the problem of front
too rich. At 500RPM flow of manifold is perfect.

I am repeating what was confirmed by flotesting.

Ron Parigoris