Hi, I just bought a used 1996 zl, it seams to be running very rich. The plugs are all black, the air filter is very old, and the ideal seams to be off. The day I bought the bike it would ownly run with the chocke open. The bike has 13000 miles, where should I start? Take it to a dealer or should I work on the bike? Thanks for any help you can give me.