Removed carb and cleaned with carb cleaner. Outboard is a 2001 15hp Mariner. Starts with a little help with the throttle but will not idle and runs rough with a lot of smoke. Did not mess with idle speed mixture setting. Did not use new gaskets. Will have to order a kit. Could the carb not be tight enough against the manifold? The gas is about a week old. There is Gumout carb. and fuel injector cleaner mixed in with the two cylce oil.
