Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Richard, many times when an engine surges, it is due to your carburetor starving for fuel. You likely have either a clogged jet, or a clogged fuel passage in the body of your carburetor.
First, check to see if you are getting a good and steady flow of fuel to your carburetor. If so, then your carburetor will likely need to be cleaned.
We can continue from here.