[alanw]

It looks like you are replacing the sprockets and retaining the old chain? Mechanically speaking, it's usually not a good idea to replace sprockets without new chains to go with it. An old (stretched) chain will cause unusual wear on a new sprocket. A new chain on an old (worn) sprocket will decrease the life of the chain. I'm not sure how much wear is involved in the Hobie parts, but it's something to think about at least.