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New Start Up Procedures for 912 Series Engines

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clint_bazzill(at)hotmail.
Guest

Posted: Tue Jul 10, 2007 11:47 am Post subject: New Start Up Procedures for 912 Series Engines

Hi All,



I know that a lot of you have been using my start up procedures.  It has 

worked for me a long time.  I have worked out a lot beter sytem that has 

been in use by me for over 80 hours and it's great.



Very similar to old one.



1)  Ignition off



2)  Throttle closed



3)   Pull choke and crank engine for 3 or 4 seconds



4)   Ignition on/ Open throttle 1 1/4 turns / Keep choke pulled and crank 

engine



5)  Release choke after engine starts and warm up 3000 RPM's or so

This system works very well, and the holding the choke does a little and 

stops false starts which happen on occasion.



_________________________________________________________________

http://liveearth.msn.com

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wingnut

Joined: 11 Jan 2006
Posts: 356

Posted: Tue Jul 10, 2007 12:21 pm Post subject: Re: New Start Up Procedures for 912 Series Engines

That's more or less what I'm doing. It might not be exactly 1 1/4 turns from idle but that's going to vary depending on where you have your idle stop set. I have mine set for 1600 RPM with a warm engine. I'll try adjusting the gaps on my plugs to see if that helps.

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_________________
Luis Rodriguez
Model IV 1200
Rotax 912UL
Flying Weekly
Laurens, SC (34A)

kerrjohna(at)comcast.net
Guest

Posted: Tue Jul 10, 2007 1:05 pm Post subject: New Start Up Procedures for 912 Series Engines

luis, the one thing that occurs to me is that you are opening the throttle some for the start.  the most success seems to come from having it completely closed with full choke then advancing throttle to warm up rpm them closing the choke.  your warm idle is about where mine is currently.

  

  ======  [quote][b]

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wingnut

Joined: 11 Jan 2006
Posts: 356

Posted: Tue Jul 10, 2007 1:59 pm Post subject: Re: New Start Up Procedures for 912 Series Engines

For some reason, this thread has split in two on the web site version of the list but hopefully, everyone involved is reading both versions so I'll limit my response to this thread to avoid clutter (I know this means nothing to those of you using email access). 



The consensus seems to be that the throttle needs to be set to the "Idle" setting for startup and then accelerating to 2500 rpm for the period only after the engine is started. "Idle", for the sake of this discussion, seems to be defined as somewhere between 1400 and 1600 RPM. This seems like an important detail because for me, pulling the throttle all the way out with a cold engine results in an idle speed that is so low that the gear box chatters. Something that I understand should be avoided as much as possible. I have indeed been using a higher setting for startup so this may end up being my problem. I will also try dropping the gap on my pluggs as Lowel suggested and hopefully this will improve things further. 



Thanks for all the help folks and thanks the kind words regarding the positive outcome of my flight test.

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_________________
Luis Rodriguez
Model IV 1200
Rotax 912UL
Flying Weekly
Laurens, SC (34A)

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