I agree that in our common lexicon cyclist is more apt to mean a bicyclist and biker is more apt to mean motorcyclist. However, if you look at the words they come from it makes more sense to switch the terms as there is no 'bike' found in the word motorcycle while there is in bicyclist. How did motorcyclists hijack our word 'biker'? I propose a worldwide campaign to correct the meanings of these words! ;-)
Hjeand