Today's Message Index:
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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
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| Subject: | 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
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| Subject: | Re: 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
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| Subject: | 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
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| Subject: | Re: 912 80hp violent vibration on cold start |
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
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