they do still make the parts but they really would like to discontinue them. when the CRF 450 first came out the team I worked with were given 2 engines to replace the Rotax 257 we used on the road race superkat. It was really pretty good. We ran the engine bone stock and was not quite as fast as the 257 it was close due the the drive ability of the power curve and superior driving. When people tried to make them as fast as the 250 it all went wrong. engines started failing with very expensive bills to repair them. If left bove stock it would have been good. I would expect the same out of the CRF250. If left stock it would a good engine.