Yeah....ok, I've caught up now......errr yeah....congrats on the new bike mate...... You could take a wire brush to the rear sprocket if you want......I think I'd be checking the condition of the chain and sprockets anyway mate, as you don't really know the history of the bike..... And here starts your first lesson in motorbike ownership.....you're hand will be permanently in your pocket from now on, because there's always something that needs replacing or servicing.....or a nice new shiny thing that needs adding (BTW....These are called Farkles ), because bikers are really just magpies in disguise!.....