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Absolute junk. I remember stuff like this being sold on ebay for $20. Probably still is! It is not a real tuner. It is merely an adjustable resistor, meant to fool an existing sensor, on the Z125 I'm betting it's to fool the O2 sensor in the exhaust, or possibly the air intake temp sensor. It causes false readings, so the stock ECU tosses in more or less fuel. If you want to tune, you are much better off getting a Power Commander, or aRacer tuner. The aRacer is a replacement ECU that you can tune, and they work very well. I've got one on my Z125, and it is very easy to setup and use.
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