---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Sat 12/05/09: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:23 AM - Re: Re: 912 80hp violent vibration on cold start (Graham Singleton) 2. 05:43 AM - Re: 912 80hp violent vibration on cold start (Catz631@aol.com) 3. 09:15 AM - Rotax 912 UL for sale (NEEL Jean Philippe) 4. 11:46 AM - Re: 912 80hp violent vibration on cold start (rparigor@suffolk.lib.ny.us) ________________________________ Message 1 _____________________________________ Time: 03:23:29 AM PST US From: Graham Singleton Subject: Re: RotaxEngines-List: Re: 912 80hp violent vibration on cold start There is no choke on a Rotax 9xx, it's a starting carburettor and won't work unless the throttle is closed. Graham Goodone wrote: > > Why don't more folks use a primer with the 912? It would seem to me that the use of a primer would help greatly. In fact, I fly a 912UL powered Skyranger that uses only a primer and no choke. My primer works by injecting fuel into the manifold pressure output port and works well. The Bing carbs have primer ports and and I do wonder why they are not more widely utilized. It would seem to me that both a primer and choke would be best in cold weather. > > ________________________________ Message 2 _____________________________________ Time: 05:43:48 AM PST US From: Catz631@aol.com Subject: Re: RotaxEngines-List: 912 80hp violent vibration on cold start I have a primer on my 912UL and I still get rough starts on occasion and I keep my airplane in a heated hanger in the winter (yes it does get to 25 degrees here in NW Florida on occasion) So I don't believe a primer is the total answer. When I bought the aircraft from a guy in Mass he insisted on starting the engine during my purchase inspection and it was 17 degrees outside! It was a horror show! I tried to get him to stop but the engine finally started after many attempts and applications of primer. I finally have a method that seems to work for me when it is cold. Three primer squirts three revolutions on my throttle from full closed to open(Vernier) This doesn't always work but is close. If the engine stumbles and hangs up at 1200 rpm I shut it down immediately and try again. It will generally start idle around 1800 rpm. These engines can be temperamental when cold. I know if my airplane was at ambient temp when cold it would be that much worse. When it is warm outside it is no problem to start except it will sometimes diesel and run backwards a few blades on shutdown when it's real hot outside. I have found a switch to premium fuel in the summer seems to help. Dick Maddux Kitfox 4 912 UL Milton,Fl ________________________________ Message 3 _____________________________________ Time: 09:15:45 AM PST US From: NEEL Jean Philippe Subject: RotaxEngines-List: Rotax 912 UL for sale Hi all,=0AI intendtobuy a new 912ULSsomy 912ULis for sale.=0A=0A912UL N=C2 =B0 4 400 976 boughtat Europa with kit N=C2=B0273 in 1996.=0A1200 hoursflig htTBO 1500h=0AAlwayshangared =0AAll maintenance in accordancewith certified aircraft rules. =0AEveryoperationregistred in enginelogbook=0AAllRotaxairwo rthiness directives applied.=0ASlipperclutch=0AOil tank=0AWater expansion b ottle=0ATemperature and pressure oilsenders=0A2 watersenders=0ACompleteexha ustsystem.=0APrice : 5000=82=AC=0A=0AJean-philippe Neel=0AGrenoble Franc e=0AJeanphilippeneel@yahoo.fr=0A=0A=0A ________________________________ Message 4 _____________________________________ Time: 11:46:38 AM PST US Subject: Re: RotaxEngines-List: 912 80hp violent vibration on cold start From: rparigor@suffolk.lib.ny.us Hi Dick "So I don't believe a primer is the total answer." This is given from a guy who has yet to start my 914, but haveexperiance with type 64s and other carbs on motorcycles. First off on my 1988 BMW R100GS, the first thing to snot up is the enriching jet that is located in the float bowl. You don't need much to hurt cold weather starting. If I get stuck in cold and can't get it to start, it is difficult on that bike to remove air cleaner duct to hand choke, thus if I blow into overflow on each carb it forces raw fuel into carb and i have always gotten a start after that. If you got stuck and don't have a primer this is an easy to do alternative in an emergency. Rotax has information on starting problems in real cold temperatures, and they have alternative parts that enrichen further, however they say you should switch to original parts when temps rise. You want good RPM cranking, thin oil and good battery and a heavy duty starter are not going to hurt. It is true best have entire engine warm when starting in cold, but if I were stuck warming up spark plugs has always done wonders. In short, before anything further make sure your carb is absolute clean, spins motor fast, and make sure gap on plugs are not too large. Ron Parigoris ------------------------------------------------------------------------------------- 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.