Have a Craftsman gas push mower that I just bought at the beginning of
this summer. Suddenly the last two times I have used it it sounds like
it's going to stall although it never does. It hums along fine for a
few seconds then sounds like it's about to stall then it picks up and
hums along again for a few seconds, almost like clockwork. When I
push down on the handle to lift the front wheels off the grass, the
engine runs fine. Any ideas?
Cleaned the air filter yet?
Make sure the throttle linkage is clear of debris/dirt.
DAGS for "surging" or "hunting" and small engines. B&S has a pretty
good FAQ site that leads thru troubleshooting process.
When I had that symptom it was diagnosed as a bad carb.
Between that, 2 bald front wheels, a dull blade and a broken blade
mounting bracket, I opted for new.
Couldn't be happier. Honda engine with an automatic choke. Starts with
one pull (or less) everytime.
Hopefully it'll do the same after being stored for it's first winter.
On Mon, 12 Oct 2009 10:44:57 -0700 (PDT), DerbyDad03
One is supposed to run the engine until it runs out of gas, but even
that leaves some gas in the carburetor.
I'VE HAD GREAT RESULTS USING STA-BIL FOR THE LAST TWO FILL-UPS OF THE
SUMMER. ONE MOWER I DIDN'T USE FOR 18 MONTHS AND IT STARTED RIGHT UP.
I would never go into winter or fall without using it.
Before you do anything, put in a new plug. A plug can break down over
time, but still start and run. If that dosen't fix it, then you can
move on to other things like carb, timing (shear pin), valves and
That's familiar to me. It often means the gas tank is nearly empty. I
think the carburetor is set to run as lean as possible at normal speed.
If it gets too lean and the engine slows, the governor opens the
throttle, which enriches the mixture enough to prevent stalling.
If it's a bowl carburetor, I'd shut off or clamp the fuel line and
unscrew the screw at the bottom of the bowl and catch the gas to see if
it has water or crud. I'd make sure the jets in the screw are clear.
I'd open the fuel line for a moment to see if the flow from the tank is
ample and see if there is any water coming from the tank.
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