Jim, it is easier if you post the details (Model, Type and Code) so we can see what kind of carburetor it has from the Illustrated Parts List.
Essentially, the water will have entered the carburetor so it will have to be stripped and cleaned, which is no big deal if it is a One or Two Piece Flo-Jet but a bit harder if it's a Walbro LMS or LMT. However depending on carburetor type the water may have gone into the cylinder and rusted everything into a single lump. If that has happened it will be a fair amount of work. There may be water in the sump as well, so that will need attention.
Once the engine type is identified, we can go through it step by step.
