QUOTE(sredish @ Mar 3 2009, 10:08 AM)

get a service manual, it'll walk you through it.
did you try a new plug? know anyone else with a cr500, you could swap the cdi and see if that fixes it. you can put a voltmeter on the magneto to see if voltage is getting put out.
no dont know anyone with another 500 its definitly not the plug . could hang on to the bare wire and nothing! do you know how to check the cdi? any help would be great! i really miss my quad and would love to ride it!!