21,000 is a lot of miles for a motorcycle spark plug. Your valves might need adjusted - I don't know if Kawasaki has solids or hydraulic in this model. Your carbs might be in need of adjustment. When was your last tune up? If you don't remember, it is time for a little TLC for the bike, my friend. Your motorcycle is 9 years old now ... it is time for service.
Testimonial: "thanks for help"
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it its idle rough and when hit the gas and let off it backfires do i need to change the plugs it has 21000 miles on do u think i need to get vales adjusted
have you done anything to try to fix this or are you just making a statement? fouled plugs? timing issues? bad gas? stuck choke? cold weather? bad wires?
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