Re: Starcraft FM 1800
The horsepower rating should be on the capacity plate on the boat. If the plate is missing, call the manufacturer. I have a 1972 Starcraft and called them for this information because my capacity plate had been partially painted over.
As for the horsepower rating, it is set by the manufacturer, not the Coast Guard. The horsepower rating formulas are for maximum rating, but the manufacturer can and sometimes does list a lower power rating. Also, the manufacturer can also do a performance test method to determine the maximum rating.
Pedestal seat bases are available from just about every maring supplier out there. You will have to be more specific if you want a better answer.