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912 mid range power problem

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n61kf

Joined: 27 Aug 2006
Posts: 23
Location: Waynesville Ohio

Posted: Fri Oct 01, 2010 4:49 pm Post subject: 912 mid range power problem

I recently started having a problem with the 912ul in my Kitfox IV. I noticed when reducing power in the pattern it would start running rough at about 4000 rpm, but then smooth out as I reduced power further. 

On the ground I did a run up check, and found it ran normal from idle to 3000 rpm, but once reaching 3000 rpm it would just fall on it face, and run extremely rough. If I advance the throttle quickly it will make it through the rough range ( 3000 rpm to 4000 rpm) and run normally above 4000 rpm.  This sounds to me most likely a carburetor problem. Have any of you run into this , and what was the fix?



Keith Schneider

KitfoxIV  912ul 200 Hrs

Waynesville , Ohio

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_________________
Keith Schneider
Red Stewart Airfield
Waynesville Ohio
KF IV 912ul

pchristensen10(at)austin.
Guest

Posted: Sat Oct 02, 2010 8:26 am Post subject: 912 mid range power problem

My 912 does the same thing. Carb heat smooths it out at all the mid 

ranges.



Pete

Kitfox III, SN1000, 912

Leander, TX

On 10/1/2010 7:49 PM, n61kf wrote:

 	  Quote: 	
		   



 I recently started having a problem with the 912ul in my Kitfox IV. I noticed when reducing power in the pattern it would start running rough at about 4000 rpm, but then smooth out as I reduced power further.

 On the ground I did a run up check, and found it ran normal from idle to 3000 rpm, but once reaching 3000 rpm it would just fall on it face, and run extremely rough. If I advance the throttle quickly it will make it through the rough range ( 3000 rpm to 4000 rpm) and run normally above 4000 rpm.  This sounds to me most likely a carburetor problem. Have any of you run into this , and what was the fix?



 Keith Schneider

 KitfoxIV  912ul 200 Hrs

 Waynesville , Ohio



 --------

 Keith Schneider

 Red Stewart Airfield

 Waynesville Ohio

 KF IV 912ul





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=314372#314372

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propellerdesign(at)tele2.
Guest

Posted: Sat Oct 02, 2010 9:55 am Post subject: 912 mid range power problem

If carb heat smooth out the rough running, it means the mixture is a bit to 

lean at mid range, hot air is less dense, making the mixture more rich.



Jan

---

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pchristensen10(at)austin.
Guest

Posted: Sat Oct 02, 2010 12:53 pm Post subject: 912 mid range power problem

See it works.



Pete

On 10/2/2010 12:53 PM, JC Propeller Design wrote:

[quote] 

 <propellerdesign(at)tele2.se>



 If carb heat smooth out the rough running, it means the mixture is a 

 bit to lean at mid range, hot air is less dense, making the mixture 

 more rich.



 Jan

 ---

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kerrjohna(at)comcast.net
Guest

Posted: Sat Oct 02, 2010 2:07 pm Post subject: 912 mid range power problem

One possible solution is to lower the circlips on the needle valve thereby raising them for slight richer mid range.Another approach is to change out the main jets to slightly larger which will richen the mixture at mid and upper range.  Fly at 5000, ease out the enrichener watching rpm closely.  If you get a slight increase in rpm this is the preferred approach,  If you lose rpm you will be better served with the first solution.

John Kerr

Classic IV, 912, 800+ hours, loving it.



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n61kf

Joined: 27 Aug 2006
Posts: 23
Location: Waynesville Ohio

Posted: Mon Oct 04, 2010 1:44 pm Post subject: Re: 912 mid range power problem

Well, moving the needles up one notch seems to be the answer. It runs much smoother from idle up to full power now. At least on the ground. Tomorrow I will sync the carbs , put on the cowl, and go fly. After a few hours I will check the plugs for color, to see if I have gone too rich.

Thanks all for the advice.



Keith

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_________________
Keith Schneider
Red Stewart Airfield
Waynesville Ohio
KF IV 912ul

Pat Reilly

Joined: 06 Aug 2009
Posts: 345

Posted: Mon Oct 04, 2010 3:06 pm Post subject: 912 mid range power problem

Keith, Moving the needle clips "up" drops the needle farther into the jet and makes your midrange leaner, not richer.

  

 Pat Reilly

 Mod 3 582 Rebuilt

 Rockford, IL

 On Mon, Oct 4, 2010 at 4:44 PM, n61kf <bkls1(at)earthlink.net (bkls1(at)earthlink.net)> wrote:

  	  Quote: 	
		  --> Kitfox-List message posted by: "n61kf" <bkls1(at)earthlink.net (bkls1(at)earthlink.net)>

 

Well, moving the needles up one notch seems to be the answer. It runs much smoother from idle up to full power now. At least on the ground. Tomorrow I will sync the carbs , put on the cowl, and go fly. After a few hours I will check the plugs for color, to see if I have gone too rich.

 Thanks all for the advice.



Keith



--------

Keith Schneider

Red Stewart Airfield

Waynesville Ohio

KF IV 912ul





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=314680#314680

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 www.matronics.com/Navigator?Kitfox-List" target="_blank">http://www.matronics.com/Navigator?Kitfox-List

 ronics.com/" target="_blank">http://forums.matronics.com

 Matt Dralle, List Admin.

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-- 

Pat Reilly

Mod 3 582 Rebuild

Rockford,IL

  [quote][b]

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Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Tue Oct 05, 2010 2:26 am Post subject: 912 mid range power problem

Give him a break, Pat, he's from Ohio!  (ducking.....)  : )



Hey, Keith, did you go to MERFI this year?



Lynn Matteson

Kitfox IV Speedster, taildragger

Jabiru 2200, #2062

Sensenich 62"x46" Wood (summer)

Electroair direct-fire ignition system

Rotec TBI-40 injection

Status: flying...1054 hrs (since 3-27-2006)

do not archive



On Oct 4, 2010, at 7:03 PM, Patrick Reilly wrote:



 	  Quote: 	
		   Keith, Moving the needle clips "up" drops the needle farther into  

 the jet and makes your midrange leaner, not richer.



 Pat Reilly

 Mod 3 582 Rebuilt

 Rockford, IL



 On Mon, Oct 4, 2010 at 4:44 PM, n61kf <bkls1(at)earthlink.net> wrote:

 



 Well, moving the needles up one notch seems to be the answer. It  

 runs much smoother from idle up to full power now. At least on the  

 ground. Tomorrow I will sync the carbs , put on the cowl, and go  

 fly. After a few hours I will check the plugs for color, to see if  

 I have gone too rich.

 Thanks all for the advice.



 Keith



 --------

 Keith Schneider

 Red Stewart Airfield

 Waynesville Ohio

 KF IV 912ul





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=314680#314680

 ist Un/Subscription,

 www.matronics.com/Navigator?Kitfox-List" target="_blank">http:// 

 www.matronics.com/Navigator?Kitfox-List

 ronics.com/" target="_blank">http://forums.matronics.com

 Matt Dralle, List Admin.

 =====

 -- 

 Pat Reilly

 Mod 3 582 Rebuild

 Rockford,IL

 www.matronics.com/contribution _- 

 ============================================================

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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

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