Today's Message Index:
----------------------
1. 01:56 PM - CJ cough/miss fire/hesitation in flight (Harv)
2. 02:01 PM - Re: CJ cough/miss fire/hesitation in flight (Ernest Martinez)
3. 02:11 PM - Re: CJ cough/miss fire/hesitation in flight (A. Dennis Savarese)
4. 02:18 PM - Re: CJ cough/miss fire/hesitation in flight (Michael Wikstrom)
5. 02:21 PM - Re: CJ cough/miss fire/hesitation in flight (Gary Luther)
6. 03:26 PM - Re: CJ cough/miss fire/hesitation in flight (Bill Culberson)
7. 03:31 PM - Re: CJ cough/miss fire/hesitation in flight (George Coy)
8. 05:11 PM - Re: CJ cough/miss fire/hesitation in flight (Gary Gabbard)
9. 05:33 PM - Re: CJ cough/miss fire/hesitation in flight (Richard Kelley)
10. 09:56 PM - Re: CJ cough/miss fire/hesitation in flight (Royden Heays)
11. 10:02 PM - Re: CJ cough/miss fire/hesitation in flight (Ernest Martinez)
12. 11:17 PM - Re: CJ cough/miss fire/hesitation in flight (Nigel Willson)
Message 1
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| Subject: | CJ cough/miss fire/hesitation in flight |
Gents
Advice sought as I have a slight misfire in flight after 25mins so.
Always seems fine on the ground run up from cold, no mag drop, t's & p's all good.
Take off fine but then once in the cruise after above amount of time engine
seems to skip a beat and get rougher. Tried leaning, richening, carb heat, fuel
primer locked, hotter and cooler cyl head temps all with no difference and
my gut feeling is a mag is going bad.
Can this be isolated on the ground via prolonged warm up? I've not tried as yet.
Any ideas sought.
If it's indeed a mag coil then anyone got a source for new ones (should both be
changed as a precaution for age)? I've asked Doug but he hasn't any stock.
Are the old ones re build able?
Thanks in advance.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=473443#473443
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| Subject: | Re: CJ cough/miss fire/hesitation in flight |
Probably a bad coil in the mag.
Ernie
On Tue, Oct 10, 2017 at 4:55 PM, Harv <martin.harvey@kbr.com> wrote:
>
> Gents
>
> Advice sought as I have a slight misfire in flight after 25mins so.
>
> Always seems fine on the ground run up from cold, no mag drop, t's & p's
> all good. Take off fine but then once in the cruise after above amount of
> time engine seems to skip a beat and get rougher. Tried leaning, richening,
> carb heat, fuel primer locked, hotter and cooler cyl head temps all with no
> difference and my gut feeling is a mag is going bad.
>
> Can this be isolated on the ground via prolonged warm up? I've not tried
> as yet.
>
> Any ideas sought.
>
> If it's indeed a mag coil then anyone got a source for new ones (should
> both be changed as a precaution for age)? I've asked Doug but he hasn't any
> stock.
>
>
> Are the old ones re build able?
>
> Thanks in advance.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=473443#473443
>
>
Message 3
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| Subject: | Re: CJ cough/miss fire/hesitation in flight |
Bad coil.=C2- Typical problem after 20-40 minutes of flight.=C2- It tak
es that long for the heat to permeate the coil.=C2- That's when the coil
breaks down.=C2- Contact George Coy in Swanton, VT.=C2- I believe he ha
s them.Dennis
From: Harv <martin.harvey@kbr.com>
To: yak-list@matronics.com
Sent: Tuesday, October 10, 2017 4:57 PM
Subject: Yak-List: CJ cough/miss fire/hesitation in flight
Gents
Advice sought as I have a slight misfire in flight after 25mins so.
Always seems fine on the ground run up from cold, no mag drop, t's & p's al
l good. Take off fine but then once in the cruise after above amount of tim
e engine seems to skip a beat and get rougher. Tried leaning, richening, ca
rb heat, fuel primer locked, hotter and cooler cyl head temps all with no d
ifference and my gut feeling is a mag is going bad.
Can this be isolated on the ground via prolonged warm up? I've not tried as
yet.
Any ideas sought.
If it's indeed a mag coil then anyone got a source for new ones (should bot
h be changed as a precaution for age)? I've asked Doug but he hasn't any st
ock.
Are the old ones re build able?
Thanks in advance.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=473443#473443
S -
WIKI -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 4
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| Subject: | Re: CJ cough/miss fire/hesitation in flight |
I agree, bad coil. Had similar problem, bought a coil from Richard Goode, i
nstalled it and problem fixed.
Cheers
Michael Wikstr=C3=B6m [iPhone]
Marine Satellite Systems
Les Espaces de Sophia
80 Route des Lucioles
06560 Valbonne
France
Tel: +33 493 958 093
Gsm: +33 607 44 40 11
Fax: +33 493 958 042
Email: michael@mssfrance.com
Web: www.mssfrance.com
VAT No: FR69347398729
> On 10 Oct 2017, at 22:59, Ernest Martinez <erniel29@gmail.com> wrote:
>
> Probably a bad coil in the mag.
>
> Ernie
>
>> On Tue, Oct 10, 2017 at 4:55 PM, Harv <martin.harvey@kbr.com> wrote:
>>
>> Gents
>>
>> Advice sought as I have a slight misfire in flight after 25mins so.
>>
>> Always seems fine on the ground run up from cold, no mag drop, t's & p's a
ll good. Take off fine but then once in the cruise after above amount of tim
e engine seems to skip a beat and get rougher. Tried leaning, richening, car
b heat, fuel primer locked, hotter and cooler cyl head temps all with no dif
ference and my gut feeling is a mag is going bad.
>>
>> Can this be isolated on the ground via prolonged warm up? I've not tried a
s yet.
>>
>> Any ideas sought.
>>
>> If it's indeed a mag coil then anyone got a source for new ones (should b
oth be changed as a precaution for age)? I've asked Doug but he hasn't any s
tock.
>>
>>
>>
>> Are the old ones re build able?
>>
>> Thanks in advance.
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=473443#473443
>>
>>
>>
>>
>>
>>
>> =========================
>> List" rel="noreferrer" target="_blank">http://www.matronics.com/Navig
ator?Yak-List
>> =========================
>> FORUMS -
>> eferrer" target="_blank">http://forums.matronics.com
>> =========================
>> WIKI -
>> errer" target="_blank">http://wiki.matronics.com
>> =========================
>> b Site -
>> -Matt Dralle, List Admin.
>> rel="noreferrer" target="_blank">http://www.matronics.com/contributio
n
>> =========================
>>
>>
>>
>
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| Subject: | Re: CJ cough/miss fire/hesitation in flight |
George Coy has them
On Tue, Oct 10, 2017 at 3:55 PM, Harv <martin.harvey@kbr.com> wrote:
>
> Gents
>
> Advice sought as I have a slight misfire in flight after 25mins so.
>
> Always seems fine on the ground run up from cold, no mag drop, t's & p's
> all good. Take off fine but then once in the cruise after above amount of
> time engine seems to skip a beat and get rougher. Tried leaning, richening,
> carb heat, fuel primer locked, hotter and cooler cyl head temps all with no
> difference and my gut feeling is a mag is going bad.
>
> Can this be isolated on the ground via prolonged warm up? I've not tried
> as yet.
>
> Any ideas sought.
>
> If it's indeed a mag coil then anyone got a source for new ones (should
> both be changed as a precaution for age)? I've asked Doug but he hasn't any
> stock.
>
>
> Are the old ones re build able?
>
> Thanks in advance.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=473443#473443
>
>
Message 6
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| Subject: | Re: CJ cough/miss fire/hesitation in flight |
It does indeed sound like a coil. I would think M-14P has them.
Bill
Red Star Aero Services
Sent from my iPhone
> On Oct 10, 2017, at 3:55 PM, Harv <martin.harvey@kbr.com> wrote:
>
>
> Gents
>
> Advice sought as I have a slight misfire in flight after 25mins so.
>
> Always seems fine on the ground run up from cold, no mag drop, t's & p's all
good. Take off fine but then once in the cruise after above amount of time engine
seems to skip a beat and get rougher. Tried leaning, richening, carb heat,
fuel primer locked, hotter and cooler cyl head temps all with no difference and
my gut feeling is a mag is going bad.
>
> Can this be isolated on the ground via prolonged warm up? I've not tried as yet.
>
> Any ideas sought.
>
> If it's indeed a mag coil then anyone got a source for new ones (should both
be changed as a precaution for age)? I've asked Doug but he hasn't any stock.
>
>
>
> Are the old ones re build able?
>
> Thanks in advance.
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=473443#473443
>
>
>
>
>
>
>
>
>
Message 7
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| Subject: | Re: CJ cough/miss fire/hesitation in flight |
I think I have at least one in stock. I can order more. They are new product
ion. Contact off list.
George coy
Sent from my iPad
> On Oct 10, 2017, at 5:09 PM, A. Dennis Savarese <dsavarese0812@bellsouth.n
et> wrote:
>
> Bad coil. Typical problem after 20-40 minutes of flight. It takes that l
ong for the heat to permeate the coil. That's when the coil breaks down. C
ontact George Coy in Swanton, VT. I believe he has them.
> Dennis
>
>
> From: Harv <martin.harvey@kbr.com>
> To: yak-list@matronics.com
> Sent: Tuesday, October 10, 2017 4:57 PM
> Subject: Yak-List: CJ cough/miss fire/hesitation in flight
>
>
> Gents
>
> Advice sought as I have a slight misfire in flight after 25mins so.
>
> Always seems fine on the ground run up from cold, no mag drop, t's & p's a
ll good. Take off fine but then once in the cruise after above amount of tim
e engine seems to skip a beat and get rougher. Tried leaning, richening, car
b heat, fuel primer locked, hotter and cooler cyl head temps all with no dif
ference and my gut feeling is a mag is going bad.
>
> Can this be isolated on the ground via prolonged warm up? I've not tried a
s yet.
>
> Any ideas sought.
>
> If it's indeed a mag coil then anyone got a source for new ones (should bo
th be changed as a precaution for age)? I've asked Doug but he hasn't any st
ock.
>
>
>
> Are the old ones re build able?
>
> Thanks in advance.
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=473443#473443
>
>
>
>
>
> http://www.matronics.com/Np; - MATRONICS WEB FORUMS -
> <; --> http:/nbsp; - NEW MATRONICS LIST WIKI -matronics.com/" t
arget="_blank">http://wiki.matronics.com
> ; -Matt Draltp://www.matronics.com/contribution" target=
"_blank">http://www.matronics=
>
>
>
>
>
Message 8
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| Subject: | Re: CJ cough/miss fire/hesitation in flight |
Check the gap on the points. Been there done that. Fixed the problem. This may
not be your problem. Remember the gap is in millimeters. Gary. LAS. CJ-22YK
Sent from my iPhone
> On Oct 10, 2017, at 15:25, Bill Culberson <migfighter42@gmail.com> wrote:
>
>
> It does indeed sound like a coil. I would think M-14P has them.
>
> Bill
> Red Star Aero Services
>
> Sent from my iPhone
>
>> On Oct 10, 2017, at 3:55 PM, Harv <martin.harvey@kbr.com> wrote:
>>
>>
>> Gents
>>
>> Advice sought as I have a slight misfire in flight after 25mins so.
>>
>> Always seems fine on the ground run up from cold, no mag drop, t's & p's all
good. Take off fine but then once in the cruise after above amount of time engine
seems to skip a beat and get rougher. Tried leaning, richening, carb heat,
fuel primer locked, hotter and cooler cyl head temps all with no difference
and my gut feeling is a mag is going bad.
>>
>> Can this be isolated on the ground via prolonged warm up? I've not tried as
yet.
>>
>> Any ideas sought.
>>
>> If it's indeed a mag coil then anyone got a source for new ones (should both
be changed as a precaution for age)? I've asked Doug but he hasn't any stock.
>>
>>
>>
>> Are the old ones re build able?
>>
>> Thanks in advance.
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=473443#473443
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
Message 9
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| Subject: | Re: CJ cough/miss fire/hesitation in flight |
Yes could be a coil most like. My was the oil wick had to much oil in it and keep
filling the points with oil. Been fine for the last 100 hrs.
Thug
Sent from my iPhone
> On Oct 10, 2017, at 5:25 PM, Bill Culberson <migfighter42@gmail.com> wrote:
>
>
> It does indeed sound like a coil. I would think M-14P has them.
>
> Bill
> Red Star Aero Services
>
> Sent from my iPhone
>
>> On Oct 10, 2017, at 3:55 PM, Harv <martin.harvey@kbr.com> wrote:
>>
>>
>> Gents
>>
>> Advice sought as I have a slight misfire in flight after 25mins so.
>>
>> Always seems fine on the ground run up from cold, no mag drop, t's & p's all
good. Take off fine but then once in the cruise after above amount of time engine
seems to skip a beat and get rougher. Tried leaning, richening, carb heat,
fuel primer locked, hotter and cooler cyl head temps all with no difference
and my gut feeling is a mag is going bad.
>>
>> Can this be isolated on the ground via prolonged warm up? I've not tried as
yet.
>>
>> Any ideas sought.
>>
>> If it's indeed a mag coil then anyone got a source for new ones (should both
be changed as a precaution for age)? I've asked Doug but he hasn't any stock.
>>
>>
>>
>> Are the old ones re build able?
>>
>> Thanks in advance.
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=473443#473443
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
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| Subject: | CJ cough/miss fire/hesitation in flight |
Hello Harv,
I have had the same problem on the M14P in a Yak 55M. Not sure if you are
talking about a Housai. Was your flight at high altitude when you ran into
the problem? Intermittent Mag problems and spark plug problems are worse at
high altitude.
In flight, when the problem occurs, try turning one mag off and see if
engine runs smoothly. Then then switch that one on and the other mag off and
check for smooth running again. If it runs rough or with an occasional
skipping a beat on each mag one by one it's unlikely to be a mag problem as
it's unlikely both mag coils would start to fail simultaneously.
In my case of missing a beat, it was on a freshly overhauled engine and it
turned out to be the pressure carb. They are supposed to be overhauled every
six years when all rubber parts are replaced. I had a spare carb that had
been recently overhauled which I canalized off a second old engine. Swapped
it out and that got rid of the missing beat.
On another more recent occasion, had a slightly rough running engine about 2
hours into a flight at 3000 ft and at 70% RPM . I thought it might be fuel
hanging up in a slightly clogged air vent, but increasing power to 80% to
85% to 90% didn't make it worse or better. The roughness was obvious from
vibration and sound and also from a slightly wavering tach needle. Even
though mags were 3% drop on each at run-up - it happened again the next week
about 1 hour into a flight at 2500 ft. Not nice - it was over water. That
was followed immediately by annual inspection. Plugs were rather sooty -
maybe carb is a bit rich. Nothing else untoward was found. Plugs were
cleaned - haven't has a problem since , albeit, have only done one short
flight and two longer flights of around 1 hour each. So the jury is still
out on that problem, at least until I do a longer flight.
Best regards
Royden
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Harv
Sent: Tuesday, October 10, 2017 1:56 PM
Subject: Yak-List: CJ cough/miss fire/hesitation in flight
Gents
Advice sought as I have a slight misfire in flight after 25mins so.
Always seems fine on the ground run up from cold, no mag drop, t's & p's all
good. Take off fine but then once in the cruise after above amount of time
engine seems to skip a beat and get rougher. Tried leaning, richening, carb
heat, fuel primer locked, hotter and cooler cyl head temps all with no
difference and my gut feeling is a mag is going bad.
Can this be isolated on the ground via prolonged warm up? I've not tried as
yet.
Any ideas sought.
If it's indeed a mag coil then anyone got a source for new ones (should both
be changed as a precaution for age)? I've asked Doug but he hasn't any
stock.
Are the old ones re build able?
Thanks in advance.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=473443#473443
Message 11
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|
| Subject: | Re: CJ cough/miss fire/hesitation in flight |
Nope. One bad coil will affect both sides. Must be a design flaw but it is
a well known fact.
On Wed, Oct 11, 2017 at 12:58 AM Royden Heays <heaysr@telus.net> wrote:
>
> Hello Harv,
>
> I have had the same problem on the M14P in a Yak 55M. Not sure if you are
> talking about a Housai. Was your flight at high altitude when you ran into
> the problem? Intermittent Mag problems and spark plug problems are worse at
> high altitude.
>
> In flight, when the problem occurs, try turning one mag off and see if
> engine runs smoothly. Then then switch that one on and the other mag off
> and
> check for smooth running again. If it runs rough or with an occasional
> skipping a beat on each mag one by one it's unlikely to be a mag problem as
> it's unlikely both mag coils would start to fail simultaneously.
>
> In my case of missing a beat, it was on a freshly overhauled engine and it
> turned out to be the pressure carb. They are supposed to be overhauled
> every
> six years when all rubber parts are replaced. I had a spare carb that had
> been recently overhauled which I canalized off a second old engine. Swapped
> it out and that got rid of the missing beat.
>
> On another more recent occasion, had a slightly rough running engine about
> 2
> hours into a flight at 3000 ft and at 70% RPM . I thought it might be fuel
> hanging up in a slightly clogged air vent, but increasing power to 80% to
> 85% to 90% didn't make it worse or better. The roughness was obvious from
> vibration and sound and also from a slightly wavering tach needle. Even
> though mags were 3% drop on each at run-up - it happened again the next
> week
> about 1 hour into a flight at 2500 ft. Not nice - it was over water. That
> was followed immediately by annual inspection. Plugs were rather sooty -
> maybe carb is a bit rich. Nothing else untoward was found. Plugs were
> cleaned - haven't has a problem since , albeit, have only done one short
> flight and two longer flights of around 1 hour each. So the jury is still
> out on that problem, at least until I do a longer flight.
>
> Best regards
>
> Royden
>
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Harv
> Sent: Tuesday, October 10, 2017 1:56 PM
> To: yak-list@matronics.com
> Subject: Yak-List: CJ cough/miss fire/hesitation in flight
>
>
> Gents
>
> Advice sought as I have a slight misfire in flight after 25mins so.
>
> Always seems fine on the ground run up from cold, no mag drop, t's & p's
> all
> good. Take off fine but then once in the cruise after above amount of time
> engine seems to skip a beat and get rougher. Tried leaning, richening, carb
> heat, fuel primer locked, hotter and cooler cyl head temps all with no
> difference and my gut feeling is a mag is going bad.
>
> Can this be isolated on the ground via prolonged warm up? I've not tried as
> yet.
>
> Any ideas sought.
>
> If it's indeed a mag coil then anyone got a source for new ones (should
> both
> be changed as a precaution for age)? I've asked Doug but he hasn't any
> stock.
>
>
> Are the old ones re build able?
>
> Thanks in advance.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=473443#473443
>
>
Message 12
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|
| Subject: | Re: CJ cough/miss fire/hesitation in flight |
Agreed. Same on a 52 from first hand experience. Bad coil affects both mags s
trangely.
Regards,
Nigel Willson
Flying Instructor & Examiner | Airshow Organiser | Display Pilot
Tel. 07809 116676
www.yakdisplay.com
Sent from my iPad
> On 11 Oct 2017, at 06:01, Ernest Martinez <erniel29@gmail.com> wrote:
>
> Nope. One bad coil will affect both sides. Must be a design flaw but it is
a well known fact.
>
>> On Wed, Oct 11, 2017 at 12:58 AM Royden Heays <heaysr@telus.net> wrote:
>>
>> Hello Harv,
>>
>> I have had the same problem on the M14P in a Yak 55M. Not sure if you are
>> talking about a Housai. Was your flight at high altitude when you ran int
o
>> the problem? Intermittent Mag problems and spark plug problems are worse a
t
>> high altitude.
>>
>> In flight, when the problem occurs, try turning one mag off and see if
>> engine runs smoothly. Then then switch that one on and the other mag off a
nd
>> check for smooth running again. If it runs rough or with an occasional
>> skipping a beat on each mag one by one it's unlikely to be a mag problem a
s
>> it's unlikely both mag coils would start to fail simultaneously.
>>
>> In my case of missing a beat, it was on a freshly overhauled engine and i
t
>> turned out to be the pressure carb. They are supposed to be overhauled ev
ery
>> six years when all rubber parts are replaced. I had a spare carb that ha
d
>> been recently overhauled which I canalized off a second old engine. Swapp
ed
>> it out and that got rid of the missing beat.
>>
>> On another more recent occasion, had a slightly rough running engine abou
t 2
>> hours into a flight at 3000 ft and at 70% RPM . I thought it might be fue
l
>> hanging up in a slightly clogged air vent, but increasing power to 80% to
>> 85% to 90% didn't make it worse or better. The roughness was obvious fro
m
>> vibration and sound and also from a slightly wavering tach needle. Even
>> though mags were 3% drop on each at run-up - it happened again the next w
eek
>> about 1 hour into a flight at 2500 ft. Not nice - it was over water. That
>> was followed immediately by annual inspection. Plugs were rather sooty -
>> maybe carb is a bit rich. Nothing else untoward was found. Plugs were
>> cleaned - haven't has a problem since , albeit, have only done one short
>> flight and two longer flights of around 1 hour each. So the jury is still
>> out on that problem, at least until I do a longer flight.
>>
>> Best regards
>>
>> Royden
>>
>>
>>
>> -----Original Message-----
>> From: owner-yak-list-server@matronics.com
>> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Harv
>> Sent: Tuesday, October 10, 2017 1:56 PM
>> To: yak-list@matronics.com
>> Subject: Yak-List: CJ cough/miss fire/hesitation in flight
>>
>>
>> Gents
>>
>> Advice sought as I have a slight misfire in flight after 25mins so.
>>
>> Always seems fine on the ground run up from cold, no mag drop, t's & p's a
ll
>> good. Take off fine but then once in the cruise after above amount of tim
e
>> engine seems to skip a beat and get rougher. Tried leaning, richening, ca
rb
>> heat, fuel primer locked, hotter and cooler cyl head temps all with no
>> difference and my gut feeling is a mag is going bad.
>>
>> Can this be isolated on the ground via prolonged warm up? I've not tried a
s
>> yet.
>>
>> Any ideas sought.
>>
>> If it's indeed a mag coil then anyone got a source for new ones (should b
oth
>> be changed as a precaution for age)? I've asked Doug but he hasn't any
>> stock.
>>
>>
>>
>> Are the old ones re build able?
>>
>> Thanks in advance.
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=473443#473443
>>
>>
>>
>>
>>
>>
>>
>>
>>
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