On Aug 9, 5:26�pm, "Calab" wrote:
Howdy!

I just received a three year old B&S 3.5 horsepower mower from a friend.
Currently, it starts easy but starts pulsing once it's been running for a
few minutes.

I've been told that the mower ran fine until it was tipped onto it's side to
be cleaned out.

What I've done so far...
�- cleaned the sponge air filter
�- drained the gas and filled with new
�- sprayed the carb with carb cleaner
�- checked oil levels
�- ensured that the throttle moves freely

The only thing that I can think of is that it's internal to the carb, or
that the springs on the carb are not in their correct location.

Photo's of the carb and linkage.

http://members.shaw.ca/linkto/temp/carb1.jpg

http://members.shaw.ca/linkto/temp/carb2.jpg

Any ideas on how to fix this?

It appears that your linkage has been modified. Go to the B&S website
and download the PDF file that will show the proper parts. Then
install the proper parts correctly. The linkage that the arrow is
pointing to is not the correct part. I am not sure about the springs.

Hank