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Briggs & Stratton Engine Problem

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Briggs & Stratton Engine Problem Manjo 04-16-2008
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Posted by on April 22, 2008, 8:34 am
> On Apr 21, 6:59 pm, pheeh.z...@gmail.com wrote:
>
> > I agree 100% with Husky.
> > I have only worked on a couple carbs like this a what he said brought
> > back memories of working on them.
>
> > Maybe Husky lives near you Manjo!
>
> > I live in Central WI.
>
> I live in eastern MA. I also agree with Husky 99%. I went to the leaf
> blower manufacturer and they only had a four-page assembly manual with
> no engine information or details. I went to B&S's web site and then
> called Customer Service. I was told by B&S the only repair manual
> they offered (to sell me and I bought) was the "Single Cylinder "L"
> Head (built after 1981) Repair manual". That B&S manual covers plenty
> of different models and carbs including mine, but it contains no
> "principals of operation", or explanation of how any of the carbs
> actually work. My carb experience is limited to motorcycle float
> carbs, but I was lucky enough at the time to find an expert forum that
> filled in the bike=92s official service manual carb blank spots.
>
> And that's why I came to this forum. I needed to fill in the big
> blanks and have been very lucky to learn from all of you and to read
> Husky's carb tutorial that has filled in a lot of carb blanks, also.
> IF ANYONE knows of a manual or web site that has an operational
> description of my carb or a similar small engine diaphragm carb, I'm
> more than happy and willing to read it and learn.
>
> (The 1% I don't agree with is the implication that I am lazy, stupid,
> and cheap. I work hard to gather any and all information and data
> available, I=92m of fair intelligence, and have and will spend money to
> buy tools and manuals to help and guide me to fix engines and
> appliances I don't feel it's necessary to pay someone $50 an hour to
> repair for me. To imply otherwise is unfair and demeaning.)
>
> Have you checked to see if the plug is wet when it dies? ---- YES,
> IT"S a little wet.
>
> Can you keep it running by spraying fuel (use WD-40, not starting
> fluid) into the carb
> intake? ---- No, the starter fluid will NOT keep the engine running,
> but will start it. But I will try WD-40.
>
> Have you tried running the engine with a spark tester in the
> plug wire? ---- No. I lost my spark tester and I'm buying a
> replacement.
>
> With the tank half full, does the inner reservoir fill up after a few
> pulls of the rope?
> ----- I DON=92T KNOW. The tank-top carb covers any possible view of the
> reservoir. IS there some trick to looking into the reservoir with the
> carb in place??
>
> Are the little "flaps" cut in the diaphragm curling up or laying flat
> against the side face of the carb? Did you use a new diaphragm, or
> just reinstall the old one? ----- THE FLAPS are laying flat against
> the carb body. YES, I did buy and install a new diaphragm, and when I
> blew out the carb body, the diaphragm and cover were OFF the carb and
> not damaged.
>
> Thanks,
>
> Manjo
>
> Manjo

You're doing a fine job of trying to isolate the problem and learn at
the same time.
This carb is NOT the easiest to understand. It is an amazing
design...but it's almost like they got one person to design this...and
them put him back in the asylum.

Posted by Manjo on April 23, 2008, 3:17 pm
On Apr 22, 8:34=A0am, pheeh.z...@gmail.com wrote:
>
>
>
>
>
> > On Apr 21, 6:59 pm, pheeh.z...@gmail.com wrote:
>
> > > I agree 100% with Husky.
> > > I have only worked on a couple carbs like this a what he said brought
> > > back memories of working on them.
>
> > > Maybe Husky lives near you Manjo!
>
> > > I live in Central WI.
>
> > I live in eastern MA. I also agree with Husky 99%. =A0I went to the leaf=

> > blower manufacturer and they only had a four-page assembly manual with
> > no engine information or details. =A0I went to B&S's web site and then
> > called Customer Service. =A0I was told by B&S the only repair manual
> > they offered (to sell me and I bought) was the "Single Cylinder "L"
> > Head (built after 1981) Repair manual". =A0That B&S manual covers plenty=

> > of different models and carbs including mine, but it contains no
> > "principals of operation", or explanation of how any of the carbs
> > actually work. =A0My carb experience is limited to motorcycle float
> > carbs, but I was lucky enough at the time to find an expert forum that
> > filled in the bike=92s official service manual carb blank spots.
>
> > And that's why I came to this forum. =A0I needed to fill in the big
> > blanks and have been very lucky to learn from all of you and to read
> > Husky's carb tutorial that has filled in a lot of carb blanks, also.
> > IF ANYONE knows of a manual or web site that has an operational
> > description of my carb or a similar small engine diaphragm carb, I'm
> > more than happy and willing to read it and learn.
>
> > (The 1% I don't agree with is the implication that I am lazy, stupid,
> > and cheap. =A0I work hard to gather any and all information and data
> > available, I=92m of fair intelligence, and have and will spend money to
> > buy tools and manuals to help and guide me to fix engines and
> > appliances I don't feel it's necessary to pay someone $50 an hour to
> > repair for me. =A0To imply otherwise is unfair and demeaning.)
>
> > Have you checked to see if the plug is wet when it dies? ---- YES,
> > IT"S a little wet.
>
> > Can you keep it running by spraying fuel (use WD-40, not starting
> > fluid) into the carb
> > intake? =A0---- No, the starter fluid will NOT keep the engine running,
> > but will start it. But I will try WD-40.
>
> > Have you tried running the engine with a spark tester in the
> > plug wire? =A0---- No. =A0I lost my spark tester and I'm buying a
> > replacement.
>
> > With the tank half full, does the inner reservoir fill up after a few
> > pulls of the rope?
> > ----- I DON=92T KNOW. =A0The tank-top carb covers any possible view of t=
he
> > reservoir. =A0IS there some trick to looking into the reservoir with the=

> > carb in place??
>
> > Are the little "flaps" cut in the diaphragm curling up or laying flat
> > against the side face of the carb? =A0Did you use a new diaphragm, or
> > just reinstall the old one? =A0 ----- THE FLAPS are laying flat against
> > the carb body. =A0YES, I did buy and install a new diaphragm, and when I=

> > blew out the carb body, the diaphragm and cover were OFF the carb and
> > not damaged.
>
> > Thanks,
>
> > Manjo
>
> > Manjo
>
> You're doing a fine job of trying to isolate the problem and learn at
> the same time.
> This carb is NOT the easiest to understand. =A0It is an amazing
> design...but it's almost like they got one person to design this...and
> them put him back in the asylum.- Hide quoted text -
>
> - Show quoted text -

Thanks. Designing carbs has to be one of the black arts. Trying to
understand them without all the documentation is a real challenge.

I'll just keep plugging along. Since I can start it and keep it
running at 1/2 choke until it warms up, then go to no choke, I'm good
for the short term.

Again, my thanks to everyone here for their input. When I get this
fixed so I have full power and it starts with one pull as it did when
I bought it, I'll post whatever I found.

Manjo

Posted by Oren on April 23, 2008, 4:50 pm
wrote:

>> > Manjo
>>
>> You're doing a fine job of trying to isolate the problem and learn at
>> the same time.
>> This carb is NOT the easiest to understand.  It is an amazing
>> design...but it's almost like they got one person to design this...and
>> them put him back in the asylum.- Hide quoted text -
>>
>> - Show quoted text -
>
>Thanks. Designing carbs has to be one of the black arts. Trying to
>understand them without all the documentation is a real challenge.
>
>I'll just keep plugging along. Since I can start it and keep it
>running at 1/2 choke until it warms up, then go to no choke, I'm good
>for the short term.
>

One more thing I can think of is, if the plug is the right heat range
(correct plug number) and the gap is set properly.

As to carbs.. it's fun when they run and you still have ten parts left
in the kit box :-))

>Again, my thanks to everyone here for their input. When I get this
>fixed so I have full power and it starts with one pull as it did when
>I bought it, I'll post whatever I found.

Posted by on April 23, 2008, 6:38 pm
> wrote:
>
>
>
> >> > Manjo
>
> >> You're doing a fine job of trying to isolate the problem and learn at
> >> the same time.
> >> This carb is NOT the easiest to understand. It is an amazing
> >> design...but it's almost like they got one person to design this...and
> >> them put him back in the asylum.- Hide quoted text -
>
> >> - Show quoted text -
>
> >Thanks. Designing carbs has to be one of the black arts. Trying to
> >understand them without all the documentation is a real challenge.
>
> >I'll just keep plugging along. Since I can start it and keep it
> >running at 1/2 choke until it warms up, then go to no choke, I'm good
> >for the short term.
>
> One more thing I can think of is, if the plug is the right heat range
> (correct plug number) and the gap is set properly.
>
> As to carbs.. it's fun when they run and you still have ten parts left
> in the kit box :-))
>
> >Again, my thanks to everyone here for their input. When I get this
> >fixed so I have full power and it starts with one pull as it did when
> >I bought it, I'll post whatever I found.

Especially with the price of gas as it is...people will try to use old
gas and not have any luck starting.
Drain the gas if you haven't done it last fall and use fresh gas.
(even Sta-Bil has its limitations)

Posted by Manjo on April 28, 2008, 9:32 am
> wrote:
>
>
>
>
>
> >> > Manjo
>
> >> You're doing a fine job of trying to isolate the problem and learn at
> >> the same time.
> >> This carb is NOT the easiest to understand. =A0It is an amazing
> >> design...but it's almost like they got one person to design this...and
> >> them put him back in the asylum.- Hide quoted text -
>
> >> - Show quoted text -
>
> >Thanks. =A0Designing carbs has to be one of the black arts. =A0Trying to
> >understand them without all the documentation is a real challenge.
>
> >I'll just keep plugging along. =A0Since I can start it and keep it
> >running at 1/2 choke until it warms up, then go to no choke, I'm good
> >for the short term.
>
> One more thing I can think of is, if the plug is the right heat range
> (correct plug number) =A0and the gap is set properly.
>
> As to carbs.. it's fun when they run and you still have ten parts left
> in the kit box :-))
>
>
>
> >Again, my thanks to everyone here for their input. =A0When I get this
> >fixed so I have full power and it starts with one pull as it did when
> >I bought it, I'll post whatever I found.- Hide quoted text -
>
> - Show quoted text -- Hide quoted text -
>
> - Show quoted text -

I'm using the spec Champion spark plug at spec gap and I used 2
different spec spark plugs (the last is brand new).

I'm now assuming and testing for a carb fuel flow problem. I've
ordered a new pick-up tube and a spring for the idle screw just to be
on the safe side. I have turned the idle screw to several different
setting with no starting improvement. I'm going to pull the carb
today for the last time and take off all the rubber parts and soak it
in Berrymans Carb Cleaner (I have a gallon can with a screen tray for
dipping). I did use spray carb cleaner a week ago that "seemed" to
help. So I'm thinking a 3-5 minute soak should get any crap and
varnish that might still be in the circuits.

As for old gas, I have removed, drained and flushed the tank already
and adding freshest gas provides little improvement. The leaf blower
seems to run better with 2-3 ounces of Berrymans Carb Fluid mixed with
a full tank of gas. Even with the carb cleaner fluid it still takes
2-3 starts before the engine keeps running on 1/2 choke and then after
9-12 minutes I can turn the choke off completely, but the engine does
run a lot longer than 2 weeks ago.

(I have been using WD-40, but I haven't needed it the last couple of
days. WD-40 doesn't make starting that much easier, but reading about
all the down sides of starter fluid in the earlier posts makes it
easier to accept a little harder starting using WD-40 when I have to).

Best regards,

Manjo



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