THIS IS A USED PART. Used CDI unit for HKS 700E with less than 50 hours. It came from an engine that was having an issue with rough running. That problem was later traced to a fuel delivery issue, but not before replacing the entire ignition. Each of those ignition components were tested on another engine by starting and running multiple throttle sweeps up to wide open throttle with only one ignition turned on. Each component of this ignition system performed identical the baseline set installed on that engine. Price is for one (1), not the pair.