If you were Registered and logged in, you could reply and use other advanced thread options
|
Posted by Jules on October 26, 2009, 7:02 pm
On Mon, 26 Oct 2009 16:39:08 -0400, gfretwell wrote:
> I had 2 with exactly the same symptom (start, won't run) and both
> would not flow fuel from the chamber with the diaphragm and inlet
> needle through the metering jet. I got one open and things were fine.
> The other is still hopelessly plugged. I bought a carb and fixed that
> one. I would still like to fix the original for a spare.
Definitely not a diaphragm issue? I've heard that they can stretch over
the years and stop pumping properly...
|
|
Posted by on October 26, 2009, 7:41 pm
On Mon, 26 Oct 2009 18:02:02 -0500, Jules
>On Mon, 26 Oct 2009 16:39:08 -0400, gfretwell wrote:
>> I had 2 with exactly the same symptom (start, won't run) and both
>> would not flow fuel from the chamber with the diaphragm and inlet
>> needle through the metering jet. I got one open and things were fine.
>> The other is still hopelessly plugged. I bought a carb and fixed that
>> one. I would still like to fix the original for a spare.
>Definitely not a diaphragm issue? I've heard that they can stretch over
>the years and stop pumping properly...
The jet is definitely plugged. Having 2 carbs that are basically the
same is a handy trouble shooting tool. You can compare what happens
when you shoot carb spray in each hole.
BTW in my foray through the net I heard several times not to blow out
these things until you take it apart, particularly the "big screw"
side since that is where the fuel pump is and you will blow the little
check valves (just flaps of mylar)
The way I finally cleared the jet I could blow open (another carb) was
to plug one end of the venturi with a test tube size rubber stopper,
fill it with lacquer thinner and blow air in the other side. Do this
outside and use a face shield. I had the whole thing wrapped in a shop
towel and it still blew thinner everywhere. (150PSI air).
It did blow the jet open tho. The other one, no joy. Plugged solid.
I am going to try soaking in carb cleaner now that I have my machine
going with a new carb and when I think I have the old one fixed I am
going to swap it back. Then I know I have a good hot spare. Yes I will
be sure I blow all the gas out ;-)
|
|
Posted by on October 26, 2009, 9:23 pm
On Mon, 26 Oct 2009 19:41:10 -0400, gfretwell@aol.com wrote:
>On Mon, 26 Oct 2009 18:02:02 -0500, Jules
>>On Mon, 26 Oct 2009 16:39:08 -0400, gfretwell wrote:
>>> I had 2 with exactly the same symptom (start, won't run) and both
>>> would not flow fuel from the chamber with the diaphragm and inlet
>>> needle through the metering jet. I got one open and things were fine.
>>> The other is still hopelessly plugged. I bought a carb and fixed that
>>> one. I would still like to fix the original for a spare.
>>Definitely not a diaphragm issue? I've heard that they can stretch over
>>the years and stop pumping properly...
>The jet is definitely plugged. Having 2 carbs that are basically the
>same is a handy trouble shooting tool. You can compare what happens
>when you shoot carb spray in each hole.
>BTW in my foray through the net I heard several times not to blow out
>these things until you take it apart, particularly the "big screw"
>side since that is where the fuel pump is and you will blow the little
>check valves (just flaps of mylar)
>The way I finally cleared the jet I could blow open (another carb) was
>to plug one end of the venturi with a test tube size rubber stopper,
>fill it with lacquer thinner and blow air in the other side. Do this
>outside and use a face shield. I had the whole thing wrapped in a shop
>towel and it still blew thinner everywhere. (150PSI air).
>It did blow the jet open tho. The other one, no joy. Plugged solid.
>I am going to try soaking in carb cleaner now that I have my machine
>going with a new carb and when I think I have the old one fixed I am
>going to swap it back. Then I know I have a good hot spare. Yes I will
>be sure I blow all the gas out ;-)
Try soaking in "SeaFoam" - buy it at NAPA
|
|
Posted by Jules on October 27, 2009, 9:06 am
On Mon, 26 Oct 2009 19:41:10 -0400, gfretwell wrote:
> On Mon, 26 Oct 2009 18:02:02 -0500, Jules
>
>>On Mon, 26 Oct 2009 16:39:08 -0400, gfretwell wrote:
>>> I had 2 with exactly the same symptom (start, won't run) and both
>>> would not flow fuel from the chamber with the diaphragm and inlet
>>> needle through the metering jet. I got one open and things were fine.
>>> The other is still hopelessly plugged. I bought a carb and fixed that
>>> one. I would still like to fix the original for a spare.
>>Definitely not a diaphragm issue? I've heard that they can stretch over
>>the years and stop pumping properly...
>
> The jet is definitely plugged. Having 2 carbs that are basically the
> same is a handy trouble shooting tool. You can compare what happens
> when you shoot carb spray in each hole.
Heh, yeah. I've got a couple of 'em here (little Walbro things) that were
DoA but _seem_ to have clear pathways. Problem is they'd both been screwed
around with before I inherited them, so the mixture settings were a mess,
but there's also no guarantee that someone didn't screw with the needle
valve settings.
I got one to the stage where it'll run, but has a habit of dying after
5-10 minutes - but I can immediately start it up and get another few
minutes out of it. Something's obviously not doing its thing right, but I
don't know if it's pump or needle (I don't think it's mixture, not when it
runs that long before flaking out)
The other one's still sick - it'll do that thing where it'll start and
hold idle, but die as soon as the throttle's opened, no matter what the
mixture setting, so I wonder if that one's got a partial blockage
somewhere.
One day I'll motivate myself to treat one of them to a new
needle and diaphragm set and see where I get... it's too cold here now to
be playing with them until April or so, though :-)
> BTW in my foray through the net I heard several times not to blow out
> these things until you take it apart, particularly the "big screw" side
> since that is where the fuel pump is and you will blow the little check
> valves (just flaps of mylar)
Yeah, that makes sense if yours are anything like mine - it'd probably do
more harm than good. Thankfully they come apart (mostly) pretty easily :-)
cheers
Jules
|
|
Posted by Stormin Mormon on October 26, 2009, 7:47 pm
I've heard of Briggs and Stratton diaphragms harden up, and
don't pump properly. Pulsa - Jet comes to mind.
--
Christopher A. Young
Learn more about Jesus
www.lds.org
.
in message
Definitely not a diaphragm issue? I've heard that they can
stretch over
the years and stop pumping properly...
|
Page 8 of 10 < 1 2 3 > last >>
| Similar Threads | Posted | | Re: How did water get in my mower carburetor? | June 24, 2005, 9:45 am |
| Re: How did water get in my mower carburetor? | June 25, 2005, 8:47 am |
| Re: How did water get in my mower carburetor? | June 25, 2005, 11:10 am |
| New Small Engine Carburetor Lacks Port for Crankcase Breather Hose | July 25, 2007, 9:48 pm |
| New Small Engine Carburetor Lacks Port for Crankcase Breather Hose | July 27, 2007, 11:36 am |
| Concrete question (regarding previous plumbing question) | October 17, 2006, 2:29 pm |
| AC and fan question | July 17, 2005, 6:59 pm |
| Yet another A/C question............... | July 19, 2005, 11:33 pm |
| AC question | August 21, 2005, 10:29 pm |
| A/C Question | August 24, 2005, 10:21 pm |
|
|
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap
> would not flow fuel from the chamber with the diaphragm and inlet
> needle through the metering jet. I got one open and things were fine.
> The other is still hopelessly plugged. I bought a carb and fixed that
> one. I would still like to fix the original for a spare.