If this is the fox carb that has ears to mount to the engine, the epoxy is probably there to stop air leaks. I would take off the carb, disassemble and clean it real good. Run a piece of fine wire through the spray bar to clean any debris out. Reassemble the carb, and mount it with some RTV gasket sealant. Be sure to clean the carb ears and crankcase with alcohol to remove any oil. Set the needles at two turns out each, prime the engine and give it a try. Good Luck!