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Starting problems (also: I passed my check ride!)

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Guy Buchanan

Joined: 16 Jul 2006
Posts: 1204
Location: Ramona, CA

Posted: Mon Jul 09, 2007 8:52 pm Post subject: Starting problems (also: I passed my check ride!)

At 08:37 PM 7/9/2007, you wrote:

 	  Quote: 	
		  There must be something wrong with my setup then. I use the choke 

but it doesn't seem to help.


	


You mentioned in your earlier post:



"I then start as normal with one full turn past idle of the vernier throttle."



My understanding of the 912 carb is that it requires the throttle to 

be AT IDLE for the choke to work. I noted this because it is similar 

to the 582, which I run. Try starting with the throttle at idle and 

using the choke. (Jump in here any time, Lowell.)

Guy Buchanan

San Diego, CA

K-IV 1200 / 582-C / Warp / 100% done, thanks mostly to Bob Ducar.

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_________________
Guy Buchanan
Deceased K-IV 1200
A glider pilot too.

lcfitt(at)sbcglobal.net
Guest

Posted: Tue Jul 10, 2007 6:26 am Post subject: Starting problems (also: I passed my check ride!)

I don't know what I can add here.  I use the Clint Bazzill start method 

which has been described pretty well in previous posts.  As designed the 

choke in the carburetor will not work unless the throttle is closed.  I 

think that is the reason for the four seconds with mags off is to fill the 

float bowl and charge the cylinders with fuel.  I then will typically open 

the throttle to idle speed then mags on and crank.  It will usually start 

promptly.



What I have found, though, that once started, throughout the day it will 

start on subsequent occasions without choking even if totally cooled down.



One good suggestion that was made is to check sparkplug gap.  As I recall it 

is recommended that the gap be at about .020 rather than what is found in 

the book.



Lowell Fitt

Cameron Park, CA

Model IV-1200 R-912 UL Warp

1998 870 hrs.

---

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wingnut

Joined: 11 Jan 2006
Posts: 356

Posted: Tue Jul 10, 2007 8:15 am Post subject: Re: Starting problems (also: I passed my check ride!)

 	  Quote: 	
		  I then will typically open the throttle to idle speed then mags on and crank. 	




I use the same technique Lowell but I'm still a little confused about the notion of "opening" the throttle to idle. If you're opening the throttle then you're talking about some setting other than all the way out right? I have my throttle stops set so that I get 1600 rpm when the engine is warm and I pull all the way out. The problem is that the idle is a bit slower when the engine is cold so "all the way out", will run too slow and I get chatter from the gearbox. The Rotax literature reccomends running at 2500 RPM when cold so that's where I try to set the throttle for starting. Should I be aiming for some point between 2500 and "all the way out" to start? 



I'll double check my spark plug gaps. I set them to the factory specs at the last change. Could this account for my rough idle between 2000 and 3000 when cold?

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

kitfoxmike

Joined: 05 Dec 2006
Posts: 373

Posted: Tue Jul 10, 2007 11:31 am Post subject: Re: Starting problems (also: I passed my check ride!)

One thing that I'm trying to understand is if this was a hot engine for restart.  If so, it's possible that you didn't let it cool down properly after runing it hard with stall, steep turns and such.  It's possible you had vapor lock.  Generally a few minutes at idle before shut down is prefered with these 912's.  when restarting a hot rotax you need to go about 1/3 throttle and as soon as it kicks over reduce to idle.

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wingnut

Joined: 11 Jan 2006
Posts: 356

Posted: Tue Jul 10, 2007 12:18 pm Post subject: Re: Starting problems (also: I passed my check ride!)

 	  Quote: 	
		  One thing that I'm trying to understand is if this was a hot engine for restart. 	




It was not a hot start. The first attempt to start was after it had been resting for over hour from the 45 min ride to the examiners home airport. The seccond attempt to start was after the check ride and all the paperwork was done.. Maybe four hours all together. It would not have started at all without that jump start from the utility cart.

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

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