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exhaust on the 912

 
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jkuehn(at)mountaintime.my
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PostPosted: Fri Apr 14, 2006 7:11 pm    Post subject: exhaust on the 912 Reply with quote

I am new to the list, and I have a question: My Rotax 912 UL has 40
hours on it, and the exhaust outlet is black, and a finger swipe inside
the outlet comes out sooty black. Is this normal? My home field is at
3600' and I regularly fly between 5500 and 9500. Is the mixture too
rich? I have the 2.27:1 gear reduction and run 87 octane autogas.
Mobil MX4T Synthetic motorcycle oil and an oil thermostat. Temps all
run very normal, engine performs well. What do others see?

Thanks,

Jack


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Thom Riddle



Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

PostPosted: Sat Apr 15, 2006 2:47 am    Post subject: exhaust on the 912 Reply with quote

Jack,

When you start up a 912 cold, the enricher (some call it a choke) must
be on to get the fuel/air ratio rich enough to start the engine. This
short period of time during cold start-up is sufficient time to coat
the exhaust outlet with soot. It is recommended not to run the enricher
any longer than necessary. Even on the coldest starts, you should be
able to close the enricher within 30 seconds or so by adding throttle
as you decrease enricher.

This does not necessarily mean that the carbs are not set up correctly
but even if they are the soot is a normal consequence of correct
starting procedure.

Thom in Buffalo


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Thom Riddle
Buffalo, NY (9G0)



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jkuehn(at)mountaintime.my
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PostPosted: Sat Apr 15, 2006 1:19 pm    Post subject: exhaust on the 912 Reply with quote

Thanks, that sounds right! It runs rough with the enrichener, so I
normally get it out as soon as possible. Thanks!

Thom Riddle wrote:

Quote:

<jtriddle(at)adelphia.net>

Jack,

When you start up a 912 cold, the enricher (some call it a choke) must
be on to get the fuel/air ratio rich enough to start the engine. This
short period of time during cold start-up is sufficient time to coat
the exhaust outlet with soot. It is recommended not to run the
enricher any longer than necessary. Even on the coldest starts, you
should be able to close the enricher within 30 seconds or so by adding
throttle as you decrease enricher.

This does not necessarily mean that the carbs are not set up correctly
but even if they are the soot is a normal consequence of correct
starting procedure.

Thom in Buffalo


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Jack Kuehn
5565 Brady Lane
Lolo, MT 59847

(406) 273-6801
(406) 546-1086 (cell)
(406) 273-2563 (fax)


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