I found the message I pasted below on this group a few days ago. I had this exact same problem with the same motor (10A902) 4HP. after reading all the replies I went and replaced the diaphragm. The mower now has a steady idle but it is much much higher than it was before. The mower also seems to run twice as loud as it used to. What do I do to fix this problem.
Tim
CanadianCowboy
My briggs and Strattan mover was working fine up until I ran it dry using every drop of gas. The next time I used the mover it runs rough with RPM's going up and down but never stalling. Is there a block in the carberator from the garbage at the bottom of the tank ? Do I have to take it apart and clean ?
Any help would be appreciated !!