Thank You for Your Question,
With the carburetor. body turned upside down, and all internal pieces in place (No Float Bowl) Hold carberator at eye level and check for the float to be level and straight in comparison to the carberator body. If this is good, adjust the level so that the gap between the float and the body is at 1/16th of an inch when looking directly from the side. Adjust by bending the float arm with a pair of needle nose pliers. Bend both arms as one and don't apply any pressure to the needle. Check again for straightness.
Also some good checks: The float is on correctly with the rounded edge up towards the body. / Check the float to be sure it isn't leaking by shaking and feeling for fuel inside of float / When the carberator is assembled fully, lightly blow air into the fuel line connection with your mouth and short piece of fuel line, flow should be impossible with the carberator. upside down and good flow with slight resistance right side up.
Be sure the carberator is clean, We soak all outboard carburetors with "Outboard Engine Decarbon Chemical" which won't hurt anything inside the carberator. and then wash off with soap and water and complete with drying off with compressed air.
Usually the problem I most often get is when a customer attempted to clean the carberator and missed one or two tiny passages. You can't spot clean it, disassemble completely and clean with the chemical. Don't remove any "Welch' plugs.
If you have any questions please don't hesitate to ask...