---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Sun 09/04/16: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:59 AM - Re: Rough running 912 UL (vernon mitchell) 2. 06:44 AM - Re: Rough running 912 UL (Jeff Wemmering) 3. 12:44 PM - Re: Rough running 912 UL (Dee LeBlanc) ________________________________ Message 1 _____________________________________ Time: 02:59:26 AM PST US From: "vernon mitchell" Subject: Re: RotaxEngines-List: Rough running 912 UL 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 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 _____________________________________ Time: 06:44:19 AM PST US From: Jeff Wemmering Subject: Re: RotaxEngines-List: Rough running 912 UL The fact that it happened so fast between one flight and another I would foc us on electronic ignition. They will probably have to be replaced if they ar e the old type. $1,000.00 Sent from my iPad > On Sep 3, 2016, at 9:54 PM, Richard Girard wrote: > > 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 a t each end (they screw on)? > > Rick Girard > >> On Sat, Sep 3, 2016 at 6:14 PM, Hugh McKay wrote: >> Started to fly my Allegro 2000 (912 UL engine) today and suddenly my engi ne is running rough. On some earlier flights I noticed the engine wanting to =9Cburp=9D or =9Cskip=9D a little bit at idle and l ow rpms (2000 to 2500), however at higher rpms it seemed to smooth out. I ha d 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 turne d off one ignition. The engine suddenly ran very rough. When I checked the o ther ignition the same thing happened. To say the least I did not fly. took i t 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 > > > > -- > =9CBlessed are the cracked, for they shall let in the light.=9D Groucho Marx > > ________________________________ Message 3 _____________________________________ Time: 12:44:21 PM PST US From: Dee LeBlanc 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 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rotaxengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RotaxEngines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rotaxengines-list Browse Digests http://www.matronics.com/digest/rotaxengines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.