Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Does the engine surge all the time? Only at idle? Only with no load? When replacing the carburetor did you do so with a new carburetor or just a different carburetor?
Was the different carburetor made for this machine? It may not have the same size jet in it which would cause a surge if the jet were smaller and not allowing enough fuel through.
The only reason that the engine would surge is a fuel restriction or bad fuel. Have you tried changing the fuel that you are running to see if it makes a difference? What happens if you manually hold the governor linkage steady with the engine running? Will it continue to run or does it die? Can you steady the rpm and remove the surge?
If the engine dies when you try to hold the governor linkage then it has to be a fuel restriction. You are not getting enough fuel through the carburetor jet or main nozzle to keep the engine running smoothly. Can you pull the choke closed slightly to smooth the engine performance?
it still surges when? After doing what? Did you clean the main jet and fuel nozzle that is in the stem of the carburetor, the main jet screws up into the center of the stem that is sticking down when you remove the bowl.