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First thing you need to do is a compression test. And spark check I know you said you had spark but lets double check. If you have spark and good compression that leaves the fuel system. Remove the cover off the front of the carburetor,remove the lower drain plug # XXXXX see what comes out, water will bead and you may find some debris, if you find anything remove the carburetor tear down and install a carb kit p/n(NNN) NNN-NNNN Make sure you remove the high speed jet # XXXXX and clean this is where all your fuel get to the engine.There are no fuel adjustments on this carburetor. Thanks click "Accept" button. Post back with questions..Tan