Manjo 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


Any chance the choke butterfly is oozing closed somehow?

Last year I had a similar frustrating problem with the vertical shaft
Tecumseh on my rotary mower. If I pushed down on the handle to raise the
front of the mower the engine would slow down noticably, but not stop.

I tried all the usuals, including draining and cleaning the fuel tank
and disassembling, cleaning and reassembling the carb with new caskets, etc.

Nothing changed, the engine still slowed down when tilted slightly back.
Not wanting to make a PhD thesis out of it I just bought a new carb
online, installed it and "Bob's yer uncle", problem gone.

Jeff

--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.8*10^12 furlongs per fortnight.