Just read it more closely, no it's not for CDI models
This is though and is even cheaper
http://cgi.ebay.co.uk/Yamaha-DT125-DT175-DT250-DT400-New-Ignition-Coil-QC125-/310191454436?cmd=ViewItem&pt=UK_Motorcycle_Parts&hash=item4838d9f8e4
Dont beat me up though if it still dont work, I can only do so so much on a qwerty keyboard,