I have consistently gained 2 mph on top speed runs from the cdi box. Won't feel it much other than a top speed run though so if you are in a drag race, it's a nice little addition. If you are woods riding where you are not likely to see top speed, not much benefit.
Someone makes an adjustable one that I don't have experience with. I don't think it will work on a DC based CDI machine such as a carbide or helix.
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