On Apr 29, 10:26 pm, George wrote:
On Sun, 20 Apr 2008 05:41:16 -0700 (PDT), Manjo
wrote:



On Apr 19, 11:00 am, dpb wrote:
Manjo wrote:
I have a leaf blower that uses a 5 hp B&S "L" head engine. ...
...
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.

I've not read the rest of the thread but noted you were apparently still
searching --

Anybody suggested checking the exhaust screen (I'm assuming it has one)
for C deposits? Sounds like it could be clogged w/ buildup which will
cause such symptoms...

--- Hide quoted text -

- Show quoted text -

The exhaust has not been checked. I did put my hand near the exhaust
canister and I could feel puffs of air as the engine ran at normal
rpm. But now that you mention this, the air pressure felt a little
low or soft. I'll pull the can and check it today. Manjo

Really, take a good look at it. I had a string trimmer with similar
start/die problems, that I spent weeks on. Rebuilt the fuel pump, etc.
Then I cleaned the 'spark suppressor' screen, and it's run perfectly
since.

I've since been told that running small engines at less than WOT will
load them up with carbon.

George

Geo, this is a 4-cycle, I know...the thread is a little long!