Today's Message Index:
----------------------
1. 07:36 AM - S7 engine mount (Rich L)
2. 08:14 AM - Re: Prop balancer for 582 (mikeperkins)
3. 09:26 AM - Re: 912 mid range power problem (Pete Christensen)
4. 10:55 AM - Re: 912 mid range power problem (JC Propeller Design)
5. 01:53 PM - Re: 912 mid range power problem (Pete Christensen)
6. 03:07 PM - Re: 912 mid range power problem (kerrjohna@comcast.net)
7. 05:48 PM - Re: Sealant for header tank fittings (dholly)
Message 1
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I have a Kitfox S-7 from Skystar with a 912uls and 650 hours on it.
I bought two engine mounts P/N 90048.000, last spring and used them to replace
the two lower mounts. I thought they were drooping too much.
The s7 I have was built from the skystar manual and I used it to replace the mounts.
It calls for a 1 7/16" rubber bushing P/N 01146.000, which was missing before
I replaced the mounts. (My building partner did it).
I installed the bushing and new mounts and noticed a small buzzing vibration after
that.
I have since rebuilt the carbs, and the gearbox and have gone full circle with
the vibration. Yes I Balanced
Is there a new mount or method in the newer S7's?
--------
Rich Little
N812RL S-7 912ULS
North Idaho
Powerfin soon to be Kiev Prop
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=314404#314404
Message 2
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| Subject: | Re: Prop balancer for 582 |
I have a flowmeter carb synchronizer laying around from my sports car days that worked well on the 532. It fits over the carb's air intake and is similar to this one: http://www.jcwhitney.com/universal-carburetor-synchronizer/p2005371.jcwx?skuId 2931&TID=231000000&zmam=15972153&zmas=21&zmac=123&zmap=492173
But I've found that if I match the closed-positions of both carbs identically (engine
off), then the flows are matched with the engine running on the ground
at cruise RPM, within a little bit.
The flowmeter in the link above has an air column that pivots, allowing it to work
with both downdrafts and sidedrafts.
Mike Perkins
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=314406#314406
Message 3
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| Subject: | Re: 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:
> --> Kitfox-List message posted by: "n61kf"<bkls1@earthlink.net>
>
> 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
>
>
Message 4
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| Subject: | Re: 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
----- Original Message -----
From: "Pete Christensen" <pchristensen10@austin.rr.com>
Sent: Saturday, October 02, 2010 6:22 PM
Subject: Re: Kitfox-List: 912 mid range power problem
> <pchristensen10@austin.rr.com>
>
> 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:
>> --> Kitfox-List message posted by: "n61kf"<bkls1@earthlink.net>
>>
>> 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
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
Message 5
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| Subject: | Re: 912 mid range power problem |
See it works.
Pete
On 10/2/2010 12:53 PM, JC Propeller Design wrote:
> <propellerdesign@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
> ----- Original Message ----- From: "Pete Christensen"
> <pchristensen10@austin.rr.com>
> To: <kitfox-list@matronics.com>
> Sent: Saturday, October 02, 2010 6:22 PM
> Subject: Re: Kitfox-List: 912 mid range power problem
>
>
>> <pchristensen10@austin.rr.com>
>>
>> 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:
>>> --> Kitfox-List message posted by: "n61kf"<bkls1@earthlink.net>
>>>
>>> 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
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>
>
Message 6
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| Subject: | Re: 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.
----- Original Message -----
From: "Pete Christensen" <pchristensen10@austin.rr.com>
Sent: Saturday, October 2, 2010 2:50:07 PM
Subject: Re: Kitfox-List: 912 mid range power problem
See it works.
Pete
On 10/2/2010 12:53 PM, JC Propeller Design wrote:
> <propellerdesign@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
> ----- Original Message ----- From: "Pete Christensen"
> <pchristensen10@austin.rr.com>
> To: <kitfox-list@matronics.com>
> Sent: Saturday, October 02, 2010 6:22 PM
> Subject: Re: Kitfox-List: 912 mid range power problem
>
>
>> <pchristensen10@austin.rr.com>
>>
>> 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:
>>>
>>> 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
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>
>
>
>
>
>
Message 7
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| Subject: | Re: Sealant for header tank fittings |
If you were to pose this question directly to Kitfox today their answer would be
Permatex 9AR Tack & Seal Gasket Sealant. Worked for me.
--------
-Kitfox III 582 Blue/C Grove Spring / Aerocet 1100 Amphibs
-Airdale Avid+ TD / W.I.B. Gear (project)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=314434#314434
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