Today's Message Index:
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1. 02:05 PM - Re: My 912 is still not happy-- (CHUCK RHOADS)
2. 02:26 PM - Re: My 912 is still not happy--My 912 is still not happy-- (Catz631@aol.com)
3. 03:14 PM - Re: My 912 is still not happy-- (Jim Feldmann)
4. 03:57 PM - Re: My 912 is still not happy-- (sdemeyer)
5. 04:46 PM - Re: Re: My 912 is still not happy-- (GRAHAM SINGLETON)
Message 1
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| Subject: | Re: My 912 is still not happy-- |
Scott,
-
Your problem sounds very similar to the one I had.- After I had done ever
ything else that I could think of I sent both carbs off and had them rebuil
t.- I tried to balance the carbs with the electronic balancer, but I stil
l had the mid range problem.- Afterwards I changed my carb choke linkage
so that I could choke each carb independently, it became apparent that one
of the carbs was running lean in mid range.- I watched the new Rotax vide
o on how to adjust the mid range circuit, the metering rod.- This is a ve
ry simple thing to do and-it solved the problem.
-
Good Luck,
Chuck Rhoads
A100
--- On Mon, 3/15/10, Carl <b.carl@sympatico.ca> wrote:
From: Carl <b.carl@sympatico.ca>
Subject: Re: RotaxEngines-List: My 912 is still not happy--
Scott.
Stop the engine in the range where it is missing, don't touch the throttle
or choke controls, check to see if the control levers on your carbs are in
sync. If not pull on them to see if they are binding. If they move restart
the engine to see if this correct the problem.
Also, the engine moves slightly when under load, depening on your throttle
setup this could cause the carb to loose their sync. Long shots but you app
ear desperate.
Carl
----- Original Message ----- From: "sdemeyer" <scottsr1100rt@yahoo.com>
Sent: Monday, March 15, 2010 10:24 AM
Subject: RotaxEngines-List: My 912 is still not happy--
com>
>
> Hi Guys,
>
> I'm out of ideas on why my 912UL continues to run rough in midrange betwe
en 2000 and 3500 RPM. I've rebuilt the carbs, I've sent the carbs in and ha
d them gone through again, I've replaced the entire ignition system includi
ng modules,coils,trigger coils and stator, spark plug wires, plug boots and
spark plugs. I've balanced the carbs several times with my carbemate. Comp
ression is good in all cylinders - 80/87.
>
> When I say rough running, I mean the engine shakes and misfires quite not
iceably between 2000 and 3500 RPM.
>
> Any suggestions on what to check next would be quite helpful!
>
>
> Thanks
> Scott
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=290350#290350
>
>
>
>
>
>
>
>
>
>
>
le, List Admin.
=0A=0A=0A
Message 2
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| Subject: | Re: My 912 is still not happy--My 912 is still not |
happy--
Scott,
I would be willing to bet that your problem is sticking throttle cables as
the guys have mentioned. I too had that problem at mid range rpms so I
replaced the throttle cables and that did the trick.I used the cables with the
Teflon center. If one cable hangs up just a little you will have one side of
the engine out of sync with the other until you pass thru that range.
Remember this engine is actually two engines with a single crankshaft. Each side
is powered by its own carb.
Item number two is fuel. Make sure you have fresh fuel. Old fuel has
caused me a great amount of havoc. I mean fuel over three weeks old! I am now
using premium auto fuel in my engine.(although not required in the 912UL),
MarineStabil,and even Lucas brand octane booster (if I don't burn the fuel in
about 3-4 weeks) are also added. This seems to have solved my occasional
dieseling on engine shutdown problem I was having.
These engines can be frustrating as hell. I have worked on mine more than
all the Lyc/Cont engines put together and that is a lot !
I hate to be an old saw on this but you could give Ronnie Smith a call at
Mississippi Light Sport Aircraft. I think he has worked on these engines
since they were invented! He sure saved my butt when I was having problems !
(which I am sure I will continue to have)
Hang in there you will eventually get it!
Dick Maddux
912UL
Milton,Fl
Message 3
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| Subject: | Re: My 912 is still not happy-- |
The enriching circuits (chokes) on the left and right carbs are mirror images of
each other. When I first got my 912 someone had reversed them, which made them
"off" at idle and "on" everywhere else. This caused all kinds of tuning problems,
and missing and shaking at low rpm was one of the symptoms.
I also rebuilt the carbs without finding that problem. I think Dean Vogel was
the one who finally told me to check for it. After I put the chokes on the correct
carb and reset the carbs to the factory settings the engine ran as smooth
as silk.
--------
Jim Feldmann, 3rd owner
1994 Kitfox IV Speedster / 912
Working on my Sport Pilot Certificate
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=290501#290501
Message 4
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| Subject: | Re: My 912 is still not happy-- |
Wow, thanks for all the suggestions! I replaced the throttle cable towards the
beginning of this issue, but that did not help. Sheesh, there are not too many
parts left to replace! I'll check the needle and maybe raise it a notch. My
EGT is running 1500 which is OK but on the warm side. The engine supposedly has
about 450 hours, although I'm a little skeptical about this. I saw quite a lot
of deposits on the valve stems, while looking into the exhaust ports so maybe
I have a valve problem.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=290514#290514
Message 5
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| Subject: | Re: My 912 is still not happy-- |
balance the carbs with a proper vacuum gauge set up. It makes an enormous d
ifference. =0AGraham=0A=0A=0A=0A=0A________________________________=0AFrom:
sdemeyer <scottsr1100rt@yahoo.com>=0ATo: rotaxengines-list@matronics.com
=0ASent: Tuesday, 16 March, 2010 21:53:03=0ASubject: RotaxEngines-List: Re:
"sdemeyer" <scottsr1100rt@yahoo.com>=0A=0AWow, thanks for all the suggestio
ns! I replaced the throttle cable towards the beginning of this issue, but
that did not help. Sheesh, there are not too many parts left to replace! I
'll check the needle and maybe raise it a notch. My EGT is running 1500 whi
ch is OK but on the warm side. The engine supposedly has about 450 hours, a
lthough I'm a little skeptical about this. I saw quite a lot of deposits on
the valve stems, while looking into the exhaust ports so maybe I have a v
alve problem.=0A=0A=0A=0A=0ARead this topic online here:=0A=0Ahttp://forums
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