[Mo]

I voted "annually". I do remove the carb every fall, when the boat comes out of the water, once I've run the antifreeze into the engine and exhaust.

Then take it home, take it apart, remove all jets, float and needle...then clean it all with brake clean or combustion chamber cleaner (either will work fine). Then reassemble and put it back on the engine the day I start her up in spring.

It's not a rebuild but I keep it maintained annually.

EDIT - additional info: Fuel filters: one filter / water separator and an additional automotive style in-line filter. I strongly suggest changing the element in the separator yearly and the in-line filter yearly as well.

Maintenance: Carb and filters...yearly....always done in the spring on start-up day so that they are fresh and gas not sitting in them for months. So change element, change in-line filter, tighten all clamps, install carb...and fire up.