Today's Message Index:
----------------------
1. 09:54 AM - M14P running very rich at idle, stumbling (ggtyler)
2. 10:06 AM - Re: M14P running very rich at idle, stumbling (A. Dennis Savarese)
3. 10:08 AM - Re: M14P running very rich at idle, stumbling (Richard Goode)
4. 10:33 AM - Re: M14P running very rich at idle, stumbling (Rico Jaeger)
5. 10:42 AM - Re: M14P running very rich at idle, stumbling (bill wade)
6. 11:39 AM - Re: M14P running very rich at idle, stumbling (ggtyler)
7. 12:06 PM - Re: Tool Kit (Rob737998)
8. 04:29 PM - Re: M14P running very rich at idle, stumbling (J Rittenbach)
9. 05:23 PM - Re: M14P running very rich at idle, stumbling (ggtyler)
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| Subject: | M14P running very rich at idle, stumbling |
On my new to me Yak 52TW, the motor is running rich at idle (puffing black smoke,
smells very rich).
At low power settings on final, it has a stumble as well.
Motor is M14PF, and boost pump is running on the ground, takeoff, and final.
I have not performed the Jim Kimball mod to the carb.
I've searched the forums, google and the repair manual but see mainly suggestions
for the loading up issues and stumble when advancing the throttle. Mine does
not stumble when advancing the throttle.
What is the best way to lean out the mixture at low RPM's?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=460716#460716
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| Subject: | Re: M14P running very rich at idle, stumbling |
The boost pump should not be running on the ground, takeoff and final.=C2
- The boost pump was installed at the Aerostar factory on the TW to elimi
nate the manual "system side pump which is/was used to pressurize the fuel
system (watch the fuel pressure instrument) prior to starting.=C2- Turn o
ff the boost pump and fly the airplane.=C2- The boost pump is flooding th
e carburetor.=C2- That should cure the problem.Dennis
From: ggtyler <ggtyler@gmail.com>
To: yak-list@matronics.com
Sent: Sunday, September 25, 2016 12:53 PM
Subject: Yak-List: M14P running very rich at idle, stumbling
On my new to me Yak 52TW, the motor is running rich at idle (puffing black
smoke, smells very rich).
At low power settings on final, it has a stumble as well.
Motor is M14PF, and boost pump is running on the ground, takeoff, and final
.
I have not performed the Jim Kimball mod to the carb.
I've searched the forums, google and the repair manual but see mainly sugge
stions for the loading up issues and stumble when advancing the throttle. M
ine does not stumble when advancing the throttle.
What is the best way to lean out the mixture at low RPM's?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=460716#460716
S -
WIKI -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
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| Subject: | M14P running very rich at idle, stumbling |
Quite simply your carburettor is not set up correctly. The idle adjustment
is clearly too rich, and I suspect the "stumble" is caused by an
acceleration jet that is too large. And, if it is running too rich at higher
power settings, then you will need a larger suction jet. These carburettors
are extremely adjustable.
Richard Goode
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of ggtyler
Sent: 25 September 2016 17:54
Subject: Yak-List: M14P running very rich at idle, stumbling
On my new to me Yak 52TW, the motor is running rich at idle (puffing black
smoke, smells very rich).
At low power settings on final, it has a stumble as well.
Motor is M14PF, and boost pump is running on the ground, takeoff, and final.
I have not performed the Jim Kimball mod to the carb.
I've searched the forums, google and the repair manual but see mainly
suggestions for the loading up issues and stumble when advancing the
throttle. Mine does not stumble when advancing the throttle.
What is the best way to lean out the mixture at low RPM's?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=460716#460716
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| Subject: | Re: M14P running very rich at idle, stumbling |
Dennis Savarese, ladies and gentlemen!!
Sent from my iPad
On Sep 25, 2016, at 12:10 PM, A. Dennis Savarese <dsavarese0812@bellsouth.n
et<mailto:dsavarese0812@bellsouth.net>> wrote:
The boost pump should not be running on the ground, takeoff and final. The
boost pump was installed at the Aerostar factory on the TW to eliminate th
e manual "system side pump which is/was used to pressurize the fuel system
(watch the fuel pressure instrument) prior to starting. Turn off the boost
pump and fly the airplane. The boost pump is flooding the carburetor. Th
at should cure the problem.
Dennis
________________________________
From: ggtyler <ggtyler@gmail.com<mailto:ggtyler@gmail.com>>
Sent: Sunday, September 25, 2016 12:53 PM
Subject: Yak-List: M14P running very rich at idle, stumbling
@gmail.com>>
On my new to me Yak 52TW, the motor is running rich at idle (puffing black
smoke, smells very rich).
At low power settings on final, it has a stumble as well.
Motor is M14PF, and boost pump is running on the ground, takeoff, and final
.
I have not performed the Jim Kimball mod to the carb.
I've searched the forums, google and the repair manual but see mainly sugge
stions for the loading up issues and stumble when advancing the throttle. M
ine does not stumble when advancing the throttle.
What is the best way to lean out the mixture at low RPM's?
Read this topic online here:
http://forums.matronics.com/vi//www.matronics.com/Navigator?Yak-List" targe
t="_blank">http://www.matronp; &n<http://forums.matro
nics.com/viewtopic.php?p=460716#460716>http://=========
==============
<http://www.matronics.com/contribution>
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| Subject: | Re: M14P running very rich at idle, stumbling |
Also just looked on barnstormers and=C2-the TW=C2-has the primer for pi
pe and cylinder that primer needs to be in the middle ie straight up and do
wn should cyl be selected after starting it continues to dump fuel to the c
yl
From: A. Dennis Savarese <dsavarese0812@bellsouth.net>
To: "yak-list@matronics.com" <yak-list@matronics.com>
Sent: Sunday, September 25, 2016 1:04 PM
Subject: Re: Yak-List: M14P running very rich at idle, stumbling
The boost pump should not be running on the ground, takeoff and final.=C2
- The boost pump was installed at the Aerostar factory on the TW to elimi
nate the manual "system side pump which is/was used to pressurize the fuel
system (watch the fuel pressure instrument) prior to starting.=C2- Turn o
ff the boost pump and fly the airplane.=C2- The boost pump is flooding th
e carburetor.=C2- That should cure the problem.Dennis
From: ggtyler <ggtyler@gmail.com>
To: yak-list@matronics.com
Sent: Sunday, September 25, 2016 12:53 PM
Subject: Yak-List: M14P running very rich at idle, stumbling
On my new to me Yak 52TW, the motor is running rich at idle (puffing black
smoke, smells very rich).
At low power settings on final, it has a stumble as well.
Motor is M14PF, and boost pump is running on the ground, takeoff, and final
.
I have not performed the Jim Kimball mod to the carb.
I've searched the forums, google and the repair manual but see mainly sugge
stions for the loading up issues and stumble when advancing the throttle. M
ine does not stumble when advancing the throttle.
What is the best way to lean out the mixture at low RPM's?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=460716#460716http://===
====================
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| Subject: | Re: M14P running very rich at idle, stumbling |
Dennis,
Thank you for the inside scoop. I must have been advised incorrectly or misunderstood
the boost pump usage procedure. I think I had been told that the boost
pump was to be running on take off and landing to provide fuel just in case the
mechanical fuel pump failed. I will do as you advised, and go from there.
My general start up procedure in regards to fuel has been to turn the boost pump
on, verify fuel pressure, then prime the engine (knob to the right) as necessary,
turn primer knob vertical again and fire up the engine. I've never had
to build pressure by turning the primer knob to the left.
Other than the stumble at pig rich idle/low rpm's, the engine runs flawlessly.
Again, thanks for the help. I'll try turning the boost pump off once running and
report back from there if that does not fix the problem.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=460722#460722
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Marc
Can't find the Tool kit listed on Ebay what is the reference please.
Regards
Rob
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=460724#460724
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| Subject: | Re: M14P running very rich at idle, stumbling |
What spark plug are you running?
JS Rittenbach
> On Sep 25, 2016, at 9:53 AM, ggtyler <ggtyler@gmail.com> wrote:
>
>
> On my new to me Yak 52TW, the motor is running rich at idle (puffing black smoke,
smells very rich).
>
> At low power settings on final, it has a stumble as well.
>
> Motor is M14PF, and boost pump is running on the ground, takeoff, and final.
>
> I have not performed the Jim Kimball mod to the carb.
>
> I've searched the forums, google and the repair manual but see mainly suggestions
for the loading up issues and stumble when advancing the throttle. Mine does
not stumble when advancing the throttle.
>
> What is the best way to lean out the mixture at low RPM's?
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=460716#460716
>
>
>
>
>
>
>
>
>
>
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| Subject: | Re: M14P running very rich at idle, stumbling |
JS Rittenbach: The TW has the auto spark plug conversion with NGK plugs. I'd have
to look through the notes, but we used whatever part number John Shuttleworth
told us to when he sent us to the store :)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=460729#460729
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