Most likely the Carburetor. Agree with Topspinmo’s suggestions, try the gum out first before pulling the carb., once pulled and cleaned you will probably need new gaskets and a carb. bowl O ring (and possibly a new float bowl needle) to complete clean out and re-build. Once problem is fixed never put gas containing ethanol in the mower again and it should be good to go indefinitely. I just cleaned and rebuilt the carburetor on our power washer that had the typical ethanol gum up clogging the carb. jets and had to order the gaskets and O ring from Amazon. I like to use a torch tip cleaning set (found in the welding area of either Lowel’s or Home Depot) to clean out the jet ports in the Carb. And then clean everything up before reassembling with an air compressor blower. Good luck.
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