On Apr 20, 7:27*am, Gary Dyrkacz.
wrote:
On Sat, 19 Apr 2008 10:00:24 -0500, 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...

How about checking around the head gasket for leaks. I had a lawnmower
engine that exhibited a similar problem.- Hide quoted text -

- Show quoted text -

I know it doesn't do much good, but I did do a visual check of the
head gasket edges. Nothing unusual, but I'll check it with some sudsy
water today. I lent out my leak down tester (I hope to get back soon)
so I had to use a standard cylinder compression tester. I got
consistent readings of 74 psi with a warm (not hot) engine. I think
this is a good reading since it's a small cylinder, unlike an auto
engine cylinder. Manjo