Today's Message Index:
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1. 03:44 AM - Re: Rough running 912 UL (vernon mitchell)
2. 12:18 PM - Re: Rough running 912 UL (Hugh McKay)
Message 1
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| Subject: | Re: Rough running 912 UL |
Hugh.
As I said, I also had a big problem with the idle jets. On
this occasion, although the jets looked clean after blowing through,
there was what appeared to be a piece of fluff which could just be seen.
Was about to put a gentle heat on it to burn it away, but managed to
clear it. To this day, not a miss.
Good luck.
Vernon.
From: Dee LeBlanc
Sent: Sunday, September 4, 2016 9:21 PM
Subject: Re: RotaxEngines-List: Rough running 912 UL
Yes, carbs have been dynamically balanced; new floats; new carb
rebuilds; new plugs; new carb boots; etc. Since purchase, engine has
run rough between 2200-2800 rpm=99s. Do know why??
Regarding your rough running engine, it's my understanding that if you
isolate the two carsb by pinching the balance line and the engine runs
rough, this is an indication that the carbs are not balanced correctly.
This is per the rotax-owner website.
Dee LeBlanc
leblancds@cox.net
cell 225-802-1038
~~~~~~~~~~~~~~~~
The Past is History
The Future is a Mystery
Today is a Gift
That=99s Why They Call it the Present
On Sep 4, 2016, at 4:55 AM, vernon mitchell <vernon11@xsinet.co.za>
wrote:
Have you had the carbs balanced? That is a sure sign. Also check the
Idle jets. We had a lot of problems on a ULS with the idle jets.
Good luck,
Vernon.
From: Hugh McKay
Sent: Sunday, September 4, 2016 1:14 AM
To: Rotax Engines
Subject: RotaxEngines-List: Rough running 912 UL
Started to fly my Allegro 2000 (912 UL engine) today and suddenly my
engine is running rough. On some earlier flights I noticed the engine
wanting to =9Cburp=9D or =9Cskip=9D a little bit
at idle and low rpms (2000 to 2500), however at higher rpms it seemed to
smooth out. I had no symptoms while in flight.
However, today when I started the engine it again was
=9Cskipping=9D at low rpms. Went through the check list and
came to the point where I checked both ignitions at 4000 rpm. Ran the
engine up to 4000 rpm and turned off one ignition. The engine suddenly
ran very rough. When I checked the other ignition the same thing
happened. To say the least I did not fly. took it back to the hanger and
parked it.
Any suggestions as to what the problem may be?
Hugh G. McKay III
Denver, NC 28037
Allegro 2000
Rotax 912 UL
780 hours TSN
Ph. 704-661-8271
email hgmckay@bellsouth.net
Message 2
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| Subject: | Re: Rough running 912 UL |
Rick,
The two Ducati ignition boxes have been on the engine since 2007.
Engine and boxes were brand new then. How do I know if they were the
=93bad ones=94? They have over 700 hours operation with out a problem.
Hugh G. McKay III, P.E. Fellow, L.M. ASCE
Senior Consultant
Worldwide Engineering Inc.
4090 North NC Hwy. 16
Denver, NC 28037
Ph. 704-661-8271
Fax 704-483-5466
email hgmckay@bellsouth.net
http://www.wwegeo.com
From: Richard Girard
Sent: Saturday, September 03, 2016 9:54 PM
Subject: Re: RotaxEngines-List: Rough running 912 UL
Have you checked the ignition boxes to see if they are the known bad
ones? Does the engine exhibit any trouble starting? Have you checked for
a broken spark plug? When was the last time you trimmed and reseated the
plug wires at each end (they screw on)?
Rick Girard
On Sat, Sep 3, 2016 at 6:14 PM, Hugh McKay <hgmckay@bellsouth.net>
wrote:
Started to fly my Allegro 2000 (912 UL engine) today and suddenly my
engine is running rough. On some earlier flights I noticed the engine
wanting to =9Cburp=9D or =9Cskip=9D a little bit
at idle and low rpms (2000 to 2500), however at higher rpms it seemed to
smooth out. I had no symptoms while in flight.
=C2
However, today when I started the engine it again was
=9Cskipping=9D at low rpms. Went through the check list and
came to the point where I checked both ignitions at 4000 rpm. Ran the
engine up to 4000 rpm and turned off one ignition. The engine suddenly
ran very rough. When I checked the other ignition the same thing
happened. To say the least I did not fly. took it back to the hanger and
parked it.
=C2
Any suggestions as to what the problem may be?
=C2
Hugh G. McKay III
Denver, NC 28037
Allegro 2000
Rotax 912 UL
780 hours TSN
=C2
Ph. 704-661-8271
email hgmckay@bellsouth.net
--
=9CBlessed are the cracked, for they shall let in the
light.=9D =C2 =C2 Groucho Marx
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