In the past couple of weeks, I had the carburator cleaned without
success. The fuel hoses were replaced as well. Finally, I drained the
tank and replaced the gas; there was some water in the tank.

The key symptom is rough running at low speed; high speed seems OK.
The idle speed was turned up; the motor doesn't cut completely off any
more.

I would appreciate any suggestions or hints. I have thought about
changing the spark plugs and fuel filter. I will likely contact the
boat dealer about picking up the boat or motor for servicing.

Seb