I would while I had it apart. Wouldn't want to have a boating day ruined for such a low cost item. I also wouldn't want to have to take everything apart again and do a link and sync a second time.
Amateur mechanic question.. Is there much more to syncing these carbs together than idle mixtures being the same? That's all my manual has to say. Here are the carbs..
Float levels, linkage adjustment, and idle mixture will effect the way the carbs function. You need to do a link and sync and then adjust idle mixture and idle speed.