What are the consequences of adjusting a carburetor's float level too high (resulting in a high fuel level in the float bowl)?

1. The engine will run rich, fuel may overflow from the carburetor vent tubes, and the spark plug may carbon foul.
2. The engine will run lean, causing high-speed hesitation and backfiring.
3. Fuel will fail to enter the carburetor bowl entirely, causing engine starvation.
4. The oil level in the crankcase will drop rapidly due to increased oil combustion.