The chain wasn't in good shape either. Although the factory chain is o-ring, the chain that was on it was not. The chain was rusty as well, and the master link was missing rollers.
When I removed the front sprocket cover, there was a lot of rust and metal shavings present.
The front sprocket also had noticable wear. The teeth had indentations on one side of them.
I ended up replacing both sprockets and the chain as a set. I bought a 530 chain, left the front sprocket stock (14-tooth), and left the rear sprocket at +2 (47-tooth).
Copyright (c) 2009 Paul Miner <$email@example.com>