Stus-List Re: A4 Running Rough

[Randy Stafford via CnC-List]

Thanks John and Tom.  In hindsight I’m not convinced I had a stuck valve, but 
did the Marvel Mystery Oil trick just for good measure.  I think it’s more 
likely that my carb’s idle jet might have been partially blocked.  Or that my 
dirty flame arrestor screen wasn’t allowing sufficient airflow at idle.  Today 
I ran some BG 44K fuel system cleaner through the A4 for ~10 minutes, with the 
flame arrestor off, and the engine idled and ran great.  I always fog the 
cylinders with Stabil fogging oil too, when laying up for winter.  And change 
the oil.  I motor at most 30 hours per year, and that’s a generous estimate.  I 
can go a whole season on one tank of gas - this year’s end-of-season refill was 
only 13 gallons (in a 20-gallon tank).

Cheers,
Randy

> On Nov 1, 2020, at 1:11 PM, Tom Buscaglia  wrote:
> 
> Randy
> 
> My 35 MK1 had an A4.  I ended up pulling the head and refacing the carb 
> before it got smooth.  I also had to flush out the cooling jacked in the 
> engine.  
> 
> AS far as rough running, yes to Marvel.  IN addition to the carb, you may 
> also want to pull the spark plug and pour a little into each cylinder.  And 
> while you have the spark plug out you can try to see the valves and release a 
> stuck valve (if that's your issue) by putting a screwdriver into the cylinder 
> through the spark plug whole and seeing if you can push the stuck valve down. 
>  Just manually rotate the crank a few times to make sure you can check them 
> all.  It is a standard flathead configuration, if that helps.  That actually 
> worked for me on one valve.
> 
> The oth4 trouble po9nt as the carb.  My 35 had been sitting for a few year 
> and the float in the carb was filled with a growth that resembled the inside 
> of a malted milk ball.  
> 
> Finally, you can get a tome of support and parts for your A4 at 
> https://moyermarine.com/ <https://moyermarine.com/>.  I could not have done 
> my engine tear down without their support.
> 
> Tom B
> 
> At 09:54 AM 11/1/2020, you wrote:
>> Content-Language: en-CA
>> Content-Type: multipart/alternative;
>>  
>> boundary="_000_DM6PR01MB5419240A001436046ABCBC91BA130DM6PR01MB5419prod_"
>> 
>> Strong  believer in this stuff. Half a bottle per tankful. If you have not 
>> emptied the tank this fall, add STABIL or a preservative. 
>> 
>>  
>> 
>> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 
>> 10
>> 
>>  
>> 
>> From: Randy Stafford via CnC-List <mailto:cnc-list@cnc-list.com>
>> Sent: November 1, 2020 9:30 AM
>> To: Stus-List <mailto:cnc-list@cnc-list.com>
>> Cc: Randy Stafford <mailto:randal.staff...@icloud.com>
>> Subject: Stus-List Re: A4 Running Rough
>> 
>>  
>> 
>> When you do this trick, how much Marvel Mystery Oil do you pour into the 
>> carb’s air intake?  A teaspoon?  An ounce?
>> 
>>  
>> 
>> Thanks,
>> 
>> Randy
>> 
>> 
>> 
>> On Oct 12, 2020, at 4:45 PM, Dennis C. > <mailto:capt...@gmail.com>> wrote:
>> 
>>  
>> 
>> Old shade tree mechanic trick.  Marvel Mystery Oil is great stuff.  However, 
>> when I did it I used automatic transmission fluid.  The AT4 I was 
>> resuscitating hadn't been run in over 10 years.  Brought it back to life.
>> 
>>  
>> 
>> I also did it late one Sunday evening after all my dock neighbors had left.  
>> I WILL make a cloud.  :)
>> 
>>   -- 
>> 
>> Dennis C.
>> 
>> Touche' 35-1 #83
>> 
>> Mandeville, LA
>> 
>>  
>> 
>>  
>> 
>> On Mon, Oct 12, 2020 at 4:32 PM james taylor > <mailto:jtsai...@gmail.com>> wrote:
>> 
>> Sounds like a sticking valve. Very common with an A4 and very easy to fix. 
>> With the engine running at moderate rpms, pour a little Marvel Mystery Oil 
>> into the carb air intake. Do this a couple of times and marvel at the smoke 
>> cloud! This will usually free up a stuck valve and return the engine to full 
>> power and smooth running!
>> 
>> James
>> 
>> Delaney
>> 
>> C 38 Mk2 #100 (with an A4)
>> 
>> Oriental, NC
>> 
>>  
>> 
>>  
>> 
>> October is the time to show your appreciation with a small contribution to 
>> this list to help offset the costs. If you want to support the list - use 
>> PayPal to send contribution --   https://www.paypal.me/stumurray 
>> <https://www.paypal.me/stumurray>  Thanks - Stu
>> 
>>  
>> 
>>  
>> October is the time to show your appreciation with a small contribu

Stus-List Re: A4 Running Rough

[Randy Stafford via CnC-List]

Thanks Josh, I did the deed today.  Removed the flame arrestor (and cleaned its 
screen thoroughly while it was off), and poured Marvel Mystery Oil into the 
carb’s air intake several times over the course of a ~10-minute engine run.  It 
did produce clouds of smoke and lower the RPM the first few times.  Probably 
used 2-3 ounces in total.  I’m confident the valves are lubed now :)  Video on 
the Facebook C owner’s group, if you’re a member.

Cheers,
Randy Stafford
S/V Grenadine
C 30 MK I #79
Ken Caryl, CO

> On Nov 1, 2020, at 8:50 AM, Josh Muckley  wrote:
> 
> You need to add just enough to do the job.  You'll know you did too much when 
> the engine dies.  You'll know you did too little when no smoke or no 
> improvement in performance.
> 
> A pinch? 
> 
> A splash?
> 
> A dash? 
> 
> A dribble?
> 
> I know, not very helpful!  Haha
> 
> If you have to pour from the bottle then just tip in a drizzle - enough for 
> smoke and rpm change.  Wait for the smoke to clear and the engine to return 
> to normal, then repeat... As the engine cleans up it will tolerate more and 
> more and the RPM will smooth.  If you want more precision, a teaspoon (5ml) 
> would be reasonable starting point.  A less messy way is to go to the epoxy 
> isle at west marine and get a 50ml syringe.  With the syringe you can just 
> meter it in nice and easy.
> 
> Josh Muckley 
> S/V Sea Hawk 
> 1989 C 37+
> Solomons, MD 
> 
> 
> On Sun, Nov 1, 2020, 09:30 Randy Stafford via CnC-List  > wrote:
> When you do this trick, how much Marvel Mystery Oil do you pour into the 
> carb’s air intake?  A teaspoon?  An ounce?
> 
> Thanks,
> Randy
> 
>> On Oct 12, 2020, at 4:45 PM, Dennis C. > > wrote:
>> 
>> Old shade tree mechanic trick.  Marvel Mystery Oil is great stuff.  However, 
>> when I did it I used automatic transmission fluid.  The AT4 I was 
>> resuscitating hadn't been run in over 10 years.  Brought it back to life.
>> 
>> I also did it late one Sunday evening after all my dock neighbors had left.  
>> I WILL make a cloud.  :)
>>   -- 
>> Dennis C.
>> Touche' 35-1 #83
>> Mandeville, LA
>> 
>> 
>> On Mon, Oct 12, 2020 at 4:32 PM james taylor > > wrote:
>> Sounds like a sticking valve. Very common with an A4 and very easy to fix. 
>> With the engine running at moderate rpms, pour a little Marvel Mystery Oil 
>> into the carb air intake. Do this a couple of times and marvel at the smoke 
>> cloud! This will usually free up a stuck valve and return the engine to full 
>> power and smooth running!
>> James
>> Delaney
>> C 38 Mk2 #100 (with an A4)
>> Oriental, NC
>> 
>> 
>> October is the time to show your appreciation with a small contribution to 
>> this list to help offset the costs. If you want to support the list - use 
>> PayPal to send contribution --   https://www.paypal.me/stumurray 
>>   Thanks - Stu
> 
> October is the time to show your appreciation with a small contribution to 
> this list to help offset the costs. If you want to support the list - use 
> PayPal to send contribution --   https://www.paypal.me/stumurray 
>   Thanks - Stu
> October is the time to show your appreciation with a small contribution to 
> this list to help offset the costs. If you want to support the list - use 
> PayPal to send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

October is the time to show your appreciation with a small contribution to this 
list to help offset the costs. If you want to support the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Stus-List Re: A4 Running Rough

[Tom Buscaglia]

Randy

My 35 MK1 had an A4.  I ended up pulling the head 
and refacing the carb before it got smooth.  I 
also had to flush out the cooling jacked in the engine.


AS far as rough running, yes to Marvel.  IN 
addition to the carb, you may also want to pull 
the spark plug and pour a little into each 
cylinder.  And while you have the spark plug out 
you can try to see the valves and release a stuck 
valve (if that's your issue) by putting a 
screwdriver into the cylinder through the spark 
plug whole and seeing if you can push the stuck 
valve down.  Just manually rotate the crank a few 
times to make sure you can check them all.  It is 
a standard flathead configuration, if that 
helps.  That actually worked for me on one valve.


The oth4 trouble po9nt as the carb.  My 35 had 
been sitting for a few year and the float in the 
carb was filled with a growth that resembled the 
inside of a malted milk ball.


Finally, you can get a tome of support and parts 
for your A4 at https://moyermarine.com/.  I could 
not have done my engine tear down without their support.


Tom B

At 09:54 AM 11/1/2020, you wrote:

Content-Language: en-CA
Content-Type: multipart/alternative;

boundary="_000_DM6PR01MB5419240A001436046ABCBC91BA130DM6PR01MB5419prod_"

Strong  believer in this stuff. Half a bottle 
per tankful. If you have not emptied the tank 
this fall, add STABIL or a preservative.




Sent from <https://go.microsoft.com/fwlink/?LinkId=550986>Mail for Windows 10



From: <mailto:cnc-list@cnc-list.com>Randy Stafford via CnC-List
Sent: November 1, 2020 9:30 AM
To: <mailto:cnc-list@cnc-list.com>Stus-List
Cc: <mailto:randal.staff...@icloud.com>Randy Stafford
Subject: Stus-List Re: A4 Running Rough



When you do this trick, how much Marvel Mystery 
Oil do you pour into the carb’s air intake?  A teaspoon?  An ounce?




Thanks,

Randy



On Oct 12, 2020, at 4:45 PM, Dennis C. 
<<mailto:capt...@gmail.com>capt...@gmail.com> wrote:




Old shade tree mechanic trick.  Marvel Mystery 
Oil is great stuff.  However, when I did it I 
used automatic transmission fluid.  The AT4 I 
was resuscitating hadn't been run in over 10 years.  Brought it back to life.




I also did it late one Sunday evening after all 
my dock neighbors had left.  I WILL make a cloud.  :)


  --

Dennis C.

Touche' 35-1 #83

Mandeville, LA





On Mon, Oct 12, 2020 at 4:32 PM james taylor 
<<mailto:jtsai...@gmail.com>jtsai...@gmail.com> wrote:


Sounds like a sticking valve. Very common with 
an A4 and very easy to fix. With the engine 
running at moderate rpms, pour a little Marvel 
Mystery Oil into the carb air intake. Do this a 
couple of times and marvel at the smoke cloud! 
This will usually free up a stuck valve and 
return the engine to full power and smooth running!


James

Delaney

C 38 Mk2 #100 (with an A4)

Oriental, NC





October is the time to show your appreciation 
with a small contribution to this list to help 
offset the costs. If you want to support the 
list - use PayPal to send contribution 
--

<https://www.paypal.me/stumurray>https://www.paypal.me/stumurray  Thanks - Stu




October is the time to show your appreciation 
with a small contribution to this list to help 
offset the costs. If you want to support the 
list - use PayPal to send contribution 
--   https://www.paypal.me/stumurray  Thanks - Stu


.¤º°`°º¤,¸¸,¤º°`°º¤¤º°`°º¤,¸¸,¤º°`°º¤.
Tom & Lynn Buscaglia
SV Alera
C 37+/40
Vashon Island WA
(206) 463-9200
www.sv-alera.com


October is the time to show your appreciation with a small contribution to this 
list to help offset the costs. If you want to support the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Stus-List Re: A4 Running Rough

[John Irvin]

Strong  believer in this stuff. Half a bottle per tankful. If you have not 
emptied the tank this fall, add STABIL or a preservative.

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

From: Randy Stafford via CnC-List<mailto:cnc-list@cnc-list.com>
Sent: November 1, 2020 9:30 AM
To: Stus-List<mailto:cnc-list@cnc-list.com>
Cc: Randy Stafford<mailto:randal.staff...@icloud.com>
Subject: Stus-List Re: A4 Running Rough

When you do this trick, how much Marvel Mystery Oil do you pour into the carb’s 
air intake?  A teaspoon?  An ounce?

Thanks,
Randy


On Oct 12, 2020, at 4:45 PM, Dennis C. 
mailto:capt...@gmail.com>> wrote:

Old shade tree mechanic trick.  Marvel Mystery Oil is great stuff.  However, 
when I did it I used automatic transmission fluid.  The AT4 I was resuscitating 
hadn't been run in over 10 years.  Brought it back to life.

I also did it late one Sunday evening after all my dock neighbors had left.  I 
WILL make a cloud.  :)
  --
Dennis C.
Touche' 35-1 #83
Mandeville, LA


On Mon, Oct 12, 2020 at 4:32 PM james taylor 
mailto:jtsai...@gmail.com>> wrote:
Sounds like a sticking valve. Very common with an A4 and very easy to fix. With 
the engine running at moderate rpms, pour a little Marvel Mystery Oil into the 
carb air intake. Do this a couple of times and marvel at the smoke cloud! This 
will usually free up a stuck valve and return the engine to full power and 
smooth running!
James
Delaney
C 38 Mk2 #100 (with an A4)
Oriental, NC


October is the time to show your appreciation with a small contribution to this 
list to help offset the costs. If you want to support the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu


October is the time to show your appreciation with a small contribution to this 
list to help offset the costs. If you want to support the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Stus-List Re: A4 Running Rough

[Josh Muckley]

You need to add just enough to do the job.  You'll know you did too much
when the engine dies.  You'll know you did too little when no smoke or no
improvement in performance.

A pinch?

A splash?

A dash?

A dribble?

I know, not very helpful!  Haha

If you have to pour from the bottle then just tip in a drizzle - enough for
smoke and rpm change.  Wait for the smoke to clear and the engine to return
to normal, then repeat... As the engine cleans up it will tolerate more and
more and the RPM will smooth.  If you want more precision, a teaspoon (5ml)
would be reasonable starting point.  A less messy way is to go to the epoxy
isle at west marine and get a 50ml syringe.  With the syringe you can just
meter it in nice and easy.

Josh Muckley
S/V Sea Hawk
1989 C 37+
Solomons, MD


On Sun, Nov 1, 2020, 09:30 Randy Stafford via CnC-List <
cnc-list@cnc-list.com> wrote:

> When you do this trick, how much Marvel Mystery Oil do you pour into the
> carb’s air intake?  A teaspoon?  An ounce?
>
> Thanks,
> Randy
>
> On Oct 12, 2020, at 4:45 PM, Dennis C.  wrote:
>
> Old shade tree mechanic trick.  Marvel Mystery Oil is great stuff.
> However, when I did it I used automatic transmission fluid.  The AT4 I was
> resuscitating hadn't been run in over 10 years.  Brought it back to life.
>
> I also did it late one Sunday evening after all my dock neighbors had
> left.  I WILL make a cloud.  :)
>   --
> Dennis C.
> Touche' 35-1 #83
> Mandeville, LA
>
>
> On Mon, Oct 12, 2020 at 4:32 PM james taylor  wrote:
>
>> Sounds like a sticking valve. Very common with an A4 and very easy to
>> fix. With the engine running at moderate rpms, pour a little Marvel Mystery
>> Oil into the carb air intake. Do this a couple of times and marvel at the
>> smoke cloud! This will usually free up a stuck valve and return the engine
>> to full power and smooth running!
>> James
>> Delaney
>> C 38 Mk2 #100 (with an A4)
>> Oriental, NC
>>
>>
>> October is the time to show your appreciation with a small contribution
> to this list to help offset the costs. If you want to support the list -
> use PayPal to send contribution --   https://www.paypal.me/stumurray
>  Thanks - Stu
>
>
> October is the time to show your appreciation with a small contribution to
> this list to help offset the costs. If you want to support the list - use
> PayPal to send contribution --   https://www.paypal.me/stumurray  Thanks
> - Stu
October is the time to show your appreciation with a small contribution to this 
list to help offset the costs. If you want to support the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Stus-List Re: A4 Running Rough

[Randy Stafford via CnC-List]

When you do this trick, how much Marvel Mystery Oil do you pour into the carb’s 
air intake?  A teaspoon?  An ounce?

Thanks,
Randy

> On Oct 12, 2020, at 4:45 PM, Dennis C.  wrote:
> 
> Old shade tree mechanic trick.  Marvel Mystery Oil is great stuff.  However, 
> when I did it I used automatic transmission fluid.  The AT4 I was 
> resuscitating hadn't been run in over 10 years.  Brought it back to life.
> 
> I also did it late one Sunday evening after all my dock neighbors had left.  
> I WILL make a cloud.  :)
>   -- 
> Dennis C.
> Touche' 35-1 #83
> Mandeville, LA
> 
> 
> On Mon, Oct 12, 2020 at 4:32 PM james taylor  > wrote:
> Sounds like a sticking valve. Very common with an A4 and very easy to fix. 
> With the engine running at moderate rpms, pour a little Marvel Mystery Oil 
> into the carb air intake. Do this a couple of times and marvel at the smoke 
> cloud! This will usually free up a stuck valve and return the engine to full 
> power and smooth running!
> James
> Delaney
> C 38 Mk2 #100 (with an A4)
> Oriental, NC
> 
> 
> October is the time to show your appreciation with a small contribution to 
> this list to help offset the costs. If you want to support the list - use 
> PayPal to send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

October is the time to show your appreciation with a small contribution to this 
list to help offset the costs. If you want to support the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Stus-List Re: A4 Running Rough

[Dennis C.]

Old shade tree mechanic trick.  Marvel Mystery Oil is great stuff.
However, when I did it I used automatic transmission fluid.  The AT4 I was
resuscitating hadn't been run in over 10 years.  Brought it back to life.

I also did it late one Sunday evening after all my dock neighbors had
left.  I WILL make a cloud.  :)
  --
Dennis C.
Touche' 35-1 #83
Mandeville, LA


On Mon, Oct 12, 2020 at 4:32 PM james taylor  wrote:

> Sounds like a sticking valve. Very common with an A4 and very easy to fix.
> With the engine running at moderate rpms, pour a little Marvel Mystery Oil
> into the carb air intake. Do this a couple of times and marvel at the smoke
> cloud! This will usually free up a stuck valve and return the engine to
> full power and smooth running!
> James
> Delaney
> C 38 Mk2 #100 (with an A4)
> Oriental, NC
>
>
>
October is the time to show your appreciation with a small contribution to this 
list to help offset the costs. If you want to support the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Stus-List Re: A4 Running Rough

[John Irvin]

Don’t forget the Marvel Mystery Oil whatever you do!

Sent from my iPhone

On Oct 12, 2020, at 5:42 PM, Randy Stafford via CnC-List 
 wrote:

 Thanks James, that’s a good hypothesis.  The observed behavior almost strikes 
me as one of the cylinders missing, as if it’s running on three cylinders.  
I’ll go pick up a bottle of Marvel Mystery Oil and try the procedure you 
recommend.

Cheers,
Randy

On Oct 12, 2020, at 3:32 PM, james taylor 
mailto:jtsai...@gmail.com>> wrote:

Sounds like a sticking valve. Very common with an A4 and very easy to fix. With 
the engine running at moderate rpms, pour a little Marvel Mystery Oil into the 
carb air intake. Do this a couple of times and marvel at the smoke cloud! This 
will usually free up a stuck valve and return the engine to full power and 
smooth running!
James
Delaney
C 38 Mk2 #100 (with an A4)
Oriental, NC

On Mon, Oct 12, 2020 at 4:03 PM Robert Mazza 
mailto:robertlma...@gmail.com>> wrote:
Could be a clogged idle jet in the carburetor. Moyer has an excellent video on 
YouTube on clearing the carburetor jets.

On Mon, Oct 12, 2020 at 3:55 PM Randy Stafford via CnC-List 
mailto:cnc-list@cnc-list.com>> wrote:
Hello Listers,

The last several times I’ve taken out my 30 MK I, her A4 has been running 
rough, especially at low RPM (sometimes quitting at idle).

I have the Moyer manuals, and will start a diagnostic procedure.  But wanted to 
check the collective wisdom here.

My first instinct is fuel flow.  I motor so little I can generally go all 
season on one tank.  This being late in the season, I wonder if I’m down to 
some sludge in the tank and my fuel filter is clogged.

Cheers,
Randy
S/V Grenadine
C 30 MK I #79
Ken Caryl, CO
October is the time to show your appreciation with a small contribution to this 
list to help offset the costs. If you want to support the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu
October is the time to show your appreciation with a small contribution to this 
list to help offset the costs. If you want to support the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu
October is the time to show your appreciation with a small contribution to this 
list to help offset the costs. If you want to support the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

October is the time to show your appreciation with a small contribution to this 
list to help offset the costs. If you want to support the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu
October is the time to show your appreciation with a small contribution to this 
list to help offset the costs. If you want to support the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Stus-List Re: A4 Running Rough

[Paul Vint]

The fuel could well be it if it's getting old. Open the fuel cap and give
it sniff and see if it smells foul.

Next things I would do:
1. Pull the spark plugs out and give them a look - see if one looks
different than the others (best to do right after having the issue... you
might find one is wet and hence not firing)
2. Pop the distrubutor cap off and give the points a look - if noting looks
obviously bad, give'm a little scuff with some fine sandpaper to clean them
up a bit.

Might if the tank is getting low it might be worth trying to burn up the
remaining fuel and try with fresh fuel and filter.

Paul
Resolute 33 MkI


On Mon, Oct 12, 2020 at 5:03 PM David Risch  wrote:

> That and the low speed in the carb jets get easily clogged...
>
> -Original Message-
> From: Randy Stafford via CnC-List 
> Sent: Monday, October 12, 2020 3:55 PM
> To: cnc-list 
> Cc: Randy Stafford 
> Subject: Stus-List A4 Running Rough
>
> Hello Listers,
>
> The last several times I’ve taken out my 30 MK I, her A4 has been running
> rough, especially at low RPM (sometimes quitting at idle).
>
> I have the Moyer manuals, and will start a diagnostic procedure.  But
> wanted to check the collective wisdom here.
>
> My first instinct is fuel flow.  I motor so little I can generally go all
> season on one tank.  This being late in the season, I wonder if I’m down to
> some sludge in the tank and my fuel filter is clogged.
>
> Cheers,
> Randy
> S/V Grenadine
> C 30 MK I #79
> Ken Caryl, CO
> October is the time to show your appreciation with a small contribution to
> this list to help offset the costs. If you want to support the list - use
> PayPal to send contribution --   https://www.paypal.me/stumurray  Thanks
> - Stu
> October is the time to show your appreciation with a small contribution to
> this list to help offset the costs. If you want to support the list - use
> PayPal to send contribution --   https://www.paypal.me/stumurray  Thanks
> - Stu
October is the time to show your appreciation with a small contribution to this 
list to help offset the costs. If you want to support the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Stus-List Re: A4 Running Rough

[Randy Stafford via CnC-List]

Thanks James, that’s a good hypothesis.  The observed behavior almost strikes 
me as one of the cylinders missing, as if it’s running on three cylinders.  
I’ll go pick up a bottle of Marvel Mystery Oil and try the procedure you 
recommend.

Cheers,
Randy

> On Oct 12, 2020, at 3:32 PM, james taylor  wrote:
> 
> Sounds like a sticking valve. Very common with an A4 and very easy to fix. 
> With the engine running at moderate rpms, pour a little Marvel Mystery Oil 
> into the carb air intake. Do this a couple of times and marvel at the smoke 
> cloud! This will usually free up a stuck valve and return the engine to full 
> power and smooth running!
> James
> Delaney
> C 38 Mk2 #100 (with an A4)
> Oriental, NC
> 
> On Mon, Oct 12, 2020 at 4:03 PM Robert Mazza  > wrote:
> Could be a clogged idle jet in the carburetor. Moyer has an excellent video 
> on YouTube on clearing the carburetor jets. 
> 
> On Mon, Oct 12, 2020 at 3:55 PM Randy Stafford via CnC-List 
> mailto:cnc-list@cnc-list.com>> wrote:
> Hello Listers,
> 
> The last several times I’ve taken out my 30 MK I, her A4 has been running 
> rough, especially at low RPM (sometimes quitting at idle).
> 
> I have the Moyer manuals, and will start a diagnostic procedure.  But wanted 
> to check the collective wisdom here.
> 
> My first instinct is fuel flow.  I motor so little I can generally go all 
> season on one tank.  This being late in the season, I wonder if I’m down to 
> some sludge in the tank and my fuel filter is clogged.
> 
> Cheers,
> Randy
> S/V Grenadine
> C 30 MK I #79
> Ken Caryl, CO
> October is the time to show your appreciation with a small contribution to 
> this list to help offset the costs. If you want to support the list - use 
> PayPal to send contribution --   https://www.paypal.me/stumurray 
>   Thanks - Stu
> October is the time to show your appreciation with a small contribution to 
> this list to help offset the costs. If you want to support the list - use 
> PayPal to send contribution --   https://www.paypal.me/stumurray 
>   Thanks - Stu
> October is the time to show your appreciation with a small contribution to 
> this list to help offset the costs. If you want to support the list - use 
> PayPal to send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

October is the time to show your appreciation with a small contribution to this 
list to help offset the costs. If you want to support the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Stus-List Re: A4 Running Rough

[james taylor]

Sounds like a sticking valve. Very common with an A4 and very easy to fix.
With the engine running at moderate rpms, pour a little Marvel Mystery Oil
into the carb air intake. Do this a couple of times and marvel at the smoke
cloud! This will usually free up a stuck valve and return the engine to
full power and smooth running!
James
Delaney
C 38 Mk2 #100 (with an A4)
Oriental, NC

On Mon, Oct 12, 2020 at 4:03 PM Robert Mazza  wrote:

> Could be a clogged idle jet in the carburetor. Moyer has an excellent
> video on YouTube on clearing the carburetor jets.
>
> On Mon, Oct 12, 2020 at 3:55 PM Randy Stafford via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
>> Hello Listers,
>>
>> The last several times I’ve taken out my 30 MK I, her A4 has been running
>> rough, especially at low RPM (sometimes quitting at idle).
>>
>> I have the Moyer manuals, and will start a diagnostic procedure.  But
>> wanted to check the collective wisdom here.
>>
>> My first instinct is fuel flow.  I motor so little I can generally go all
>> season on one tank.  This being late in the season, I wonder if I’m down to
>> some sludge in the tank and my fuel filter is clogged.
>>
>> Cheers,
>> Randy
>> S/V Grenadine
>> C 30 MK I #79
>> Ken Caryl, CO
>> October is the time to show your appreciation with a small contribution
>> to this list to help offset the costs. If you want to support the list -
>> use PayPal to send contribution --   https://www.paypal.me/stumurray
>> Thanks - Stu
>
> October is the time to show your appreciation with a small contribution to
> this list to help offset the costs. If you want to support the list - use
> PayPal to send contribution --   https://www.paypal.me/stumurray  Thanks
> - Stu
October is the time to show your appreciation with a small contribution to this 
list to help offset the costs. If you want to support the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Stus-List Re: A4 Running Rough

[David Risch]

That and the low speed in the carb jets get easily clogged...

-Original Message-
From: Randy Stafford via CnC-List  
Sent: Monday, October 12, 2020 3:55 PM
To: cnc-list 
Cc: Randy Stafford 
Subject: Stus-List A4 Running Rough

Hello Listers,

The last several times I’ve taken out my 30 MK I, her A4 has been running 
rough, especially at low RPM (sometimes quitting at idle).

I have the Moyer manuals, and will start a diagnostic procedure.  But wanted to 
check the collective wisdom here.

My first instinct is fuel flow.  I motor so little I can generally go all 
season on one tank.  This being late in the season, I wonder if I’m down to 
some sludge in the tank and my fuel filter is clogged.

Cheers,
Randy
S/V Grenadine
C 30 MK I #79
Ken Caryl, CO
October is the time to show your appreciation with a small contribution to this 
list to help offset the costs. If you want to support the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu
October is the time to show your appreciation with a small contribution to this 
list to help offset the costs. If you want to support the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Stus-List Re: A4 Running Rough

[Randy Stafford via CnC-List]

At that time when we were heading out, we were motoring into ~50mph gusts.  I 
have another problem (which I know how to fix, and have the gasket to do the 
job), which is that my A4 slips out of gear when under too much load.  So I 
couldn’t throttle up more in that video you saw.

Cheers,
Randy

> On Oct 12, 2020, at 2:21 PM, Bill Coleman  wrote:
> 
> I see what you mean, I noticed you were motoring pretty slowly into the wind 
> yesterday.  Or was that the 50 Knots winds . . .?
> 
> 
> Bill Coleman
> Entrada, Erie, PA
> 
> 
> Subject: Stus-List A4 Running Rough
> 
> Hello Listers,
> 
> The last several times I’ve taken out my 30 MK I, her A4 has been running 
> rough, especially at low RPM (sometimes quitting at idle).
> 
> I have the Moyer manuals, and will start a diagnostic procedure.  But wanted 
> to check the collective wisdom here.
> 
> My first instinct is fuel flow.  I motor so little I can generally go all 
> season on one tank.  This being late in the season, I wonder if I’m down to 
> some sludge in the tank and my fuel filter is clogged.
> 
> Cheers,
> Randy
> S/V Grenadine
> C 30 MK I #79
> Ken Caryl, CO
> October is the time to show your appreciation with a small contribution to 
> this list to help offset the costs. If you want to support the list - use 
> PayPal to send contribution --   https://www.paypal.me/stumurray  Thanks - Stu
> October is the time to show your appreciation with a small contribution to 
> this list to help offset the costs. If you want to support the list - use 
> PayPal to send contribution --   https://www.paypal.me/stumurray  Thanks - Stu
October is the time to show your appreciation with a small contribution to this 
list to help offset the costs. If you want to support the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Stus-List Re: A4 Running Rough

[Bill Coleman]

I see what you mean, I noticed you were motoring pretty slowly into the wind 
yesterday.  Or was that the 50 Knots winds . . .?


Bill Coleman
Entrada, Erie, PA


Subject: Stus-List A4 Running Rough

Hello Listers,

The last several times I’ve taken out my 30 MK I, her A4 has been running 
rough, especially at low RPM (sometimes quitting at idle).

I have the Moyer manuals, and will start a diagnostic procedure.  But wanted to 
check the collective wisdom here.

My first instinct is fuel flow.  I motor so little I can generally go all 
season on one tank.  This being late in the season, I wonder if I’m down to 
some sludge in the tank and my fuel filter is clogged.

Cheers,
Randy
S/V Grenadine
C 30 MK I #79
Ken Caryl, CO
October is the time to show your appreciation with a small contribution to this 
list to help offset the costs. If you want to support the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu
October is the time to show your appreciation with a small contribution to this 
list to help offset the costs. If you want to support the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Stus-List Re: A4 Running Rough

[Robert Mazza]

Could be a clogged idle jet in the carburetor. Moyer has an excellent video
on YouTube on clearing the carburetor jets.

On Mon, Oct 12, 2020 at 3:55 PM Randy Stafford via CnC-List <
cnc-list@cnc-list.com> wrote:

> Hello Listers,
>
> The last several times I’ve taken out my 30 MK I, her A4 has been running
> rough, especially at low RPM (sometimes quitting at idle).
>
> I have the Moyer manuals, and will start a diagnostic procedure.  But
> wanted to check the collective wisdom here.
>
> My first instinct is fuel flow.  I motor so little I can generally go all
> season on one tank.  This being late in the season, I wonder if I’m down to
> some sludge in the tank and my fuel filter is clogged.
>
> Cheers,
> Randy
> S/V Grenadine
> C 30 MK I #79
> Ken Caryl, CO
> October is the time to show your appreciation with a small contribution to
> this list to help offset the costs. If you want to support the list - use
> PayPal to send contribution --   https://www.paypal.me/stumurray  Thanks
> - Stu
October is the time to show your appreciation with a small contribution to this 
list to help offset the costs. If you want to support the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu