So I recently bought a 2004 rm 250, it needed a new bottom end. So As I took it apart I realized there was a nick inside one of the ports and I ordered a new bottom end, new piston kit and a brand new cylinder from Suzuki that I payed 550 for. I come to find out it fits 03-06 but needs all the k6 parts to go w/ it and I have came to the point to where I give up on it. I tried to return it but they wouldn't take it back, if anyone has a 2006 rm 250 and needs a new cylinder I have one for sale. Anyone with a 03-05 and wants to take the time to get the k6 power valve parts it will work for you to! These cylinders run for about 630 on eBay and anywhere else. Just let me know if you would be interested in buying mine!