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
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| Subject: | Re: 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
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| Subject: | Re: 912UL rough at around 4000 |
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
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| Subject: | 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
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| Subject: | 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
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| Subject: | Re: ROTAX 914 #1 plug |
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
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