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Subject Author Date
Briggs & Stratton Engine Problem Manjo 04-16-2008
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Posted by Manjo on April 17, 2008, 8:31 am
>
> > the
> > engine still will not stay running for more than 30 - 40 seconds.
>
> Got to be spark or fuel, sounds like fuel. =A0Assuming this is a 2-
> cycle, how's the fuel mix? =A0I always like to check the simplest thing
> first.
>
> Other than that, you'll have to hold it up to the interweb so I can
> hear it.
> =A0-----
>
> - gpsman

gpsman,

Nope, I wish it were. It's a 4-cycle.

I have unlimited web phone. I could call you, but I think I can
describe just as well:
It starts normally and revs up fine. The governor is NOT NOT pulling
the throttle butterfly closed. After 4-5 seconds of running fine, the
rpms start to drop and within 10-15 seconds the rpms drop to zero.
When it dies, sometimes there's a small puff of exhaust out the carb,
and once I could feel a slight spray-back of fuel out of the carb.

Manjo (see other replies below)

Special 468x60
Posted by S. Barker on April 17, 2008, 1:00 am
try it with the gas cap off.

s


>I have a leaf blower that uses a 5 hp B&S "L" head engine. The carb
> is pretty simple with a choke butterfly, throttle butterfly, and
> rubber diaphragm fuel pump. The carb sits on top of the fule tank.
> The carb has no bowl. The governor linakges are clean and the
> governor appears to be working fine.
>
> The leaf blower was starting to run poorly last fall. This spring it
> started right up, but after4-5 seconds after running smoothly at
> proper speed, it will slowly loose rpms and finally stop after 15-20
> seconds.
>
> I have cleaned the pick-up tube, replaced the carburetor diaphragm
> fuel pump along with the gaskets between the carb and the fuel tank,
> and the gasket between the carb and the engine. I've also
> disconnected the engine ground wire that normally kills the engine
> when the throttle is tuned full off. But after doing all this the
> engine still will not stay running for more than 30 - 40 seconds.
>
> Thanks in advance for any tips, suggestions, or coments.
>
> Manjo



Posted by Manjo on April 17, 2008, 8:35 am
> try it with the gas cap off.
>
> s
>
>
>
>
>
> >I have a leaf blower that uses a 5 hp B&S "L" head engine. =A0The carb
> > is pretty simple with a choke butterfly, throttle butterfly, and
> > rubber diaphragm fuel pump. =A0The carb sits on top of the fule tank.
> > The carb has no bowl. =A0The governor linakges are clean and the
> > governor appears to be working fine.
>
> > The leaf blower was starting to run poorly last fall. =A0This spring it
> > started right up, but after4-5 seconds after running smoothly at
> > proper speed, it will slowly loose rpms and finally stop after 15-20
> > seconds.
>
> > I have cleaned the pick-up tube, replaced the carburetor diaphragm
> > fuel pump along with the gaskets between the carb and the fuel tank,
> > and the gasket between the carb and the engine. =A0I've also
> > disconnected the engine ground wire that normally kills the engine
> > when the throttle is tuned full off. =A0But after doing all this the
> > engine still will not stay running for more than 30 - 40 seconds.
>
> > Thanks in advance for any tips, suggestions, or coments.
>
> > Manjo- Hide quoted text -
>
> - Show quoted text -

s,

I don't think it's a gas tank vacuum problem. I did remove the cap
completely and got the same symptoms with no changes (engine ran for a
little while then slowly died).

Manjo


Posted by Oren on April 17, 2008, 1:04 am
wrote:

>I have a leaf blower that uses a 5 hp B&S "L" head engine. The carb
>is pretty simple with a choke butterfly, throttle butterfly, and
>rubber diaphragm fuel pump. The carb sits on top of the fule tank.
>The carb has no bowl. The governor linakges are clean and the
>governor appears to be working fine.
>
>The leaf blower was starting to run poorly last fall. This spring it
>started right up, but after4-5 seconds after running smoothly at
>proper speed, it will slowly loose rpms and finally stop after 15-20
>seconds.
>
>I have cleaned the pick-up tube, replaced the carburetor diaphragm
>fuel pump along with the gaskets between the carb and the fuel tank,
>and the gasket between the carb and the engine. I've also
>disconnected the engine ground wire that normally kills the engine
>when the throttle is tuned full off. But after doing all this the
>engine still will not stay running for more than 30 - 40 seconds.
>
>Thanks in advance for any tips, suggestions, or coments.
>
>Manjo

Examine the spark plug or just replace it. Check for fuel /air mixture
adjustment. Make sure air filter is clean.

Compare sprak plug to this chart.

http://hawkworks.net/sparkplug-chart/

Posted by Manjo on April 17, 2008, 8:51 am
> wrote:
>
>
>
>
>
> >I have a leaf blower that uses a 5 hp B&S "L" head engine. =A0The carb
> >is pretty simple with a choke butterfly, throttle butterfly, and
> >rubber diaphragm fuel pump. =A0The carb sits on top of the fule tank.
> >The carb has no bowl. =A0The governor linakges are clean and the
> >governor appears to be working fine.
>
> >The leaf blower was starting to run poorly last fall. =A0This spring it
> >started right up, but after4-5 seconds after running smoothly at
> >proper speed, it will slowly loose rpms and finally stop after 15-20
> >seconds.
>
> >I have cleaned the pick-up tube, replaced the carburetor diaphragm
> >fuel pump along with the gaskets between the carb and the fuel tank,
> >and the gasket between the carb and the engine. =A0I've also
> >disconnected the engine ground wire that normally kills the engine
> >when the throttle is tuned full off. =A0But after doing all this the
> >engine still will not stay running for more than 30 - 40 seconds.
>
> >Thanks in advance for any tips, suggestions, or coments.
>
> >Manjo
>
> Examine the spark plug or just replace it. Check for fuel /air mixture
> adjustment. Make sure air filter is clean.
>
> Compare sprak plug to this chart.
>
> http://hawkworks.net/sparkplug-chart/- Hide quoted text -
>
> - Show quoted text -

The old spark plug was installed last fall. But I did replace the
spark plug yesterday just in case, but with no improvement.

I'll check the idle screw. There seem to be no other carb fuel
adjustment screws per the parts list and B&S repair manual.

Manjo

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