TTR Dave said:Getmetoca: My riding buddy and I both have the HT Racing 351cc kit in our 04 250RFS.. Huge difference, like KTM Chris said. Bill at HT Racing can either do the work or a good KTM shop should be able to do it easily. The 305cc kit is more for the tight woods and the 351cc kit works great in the SoCal desert. I went up two teeth on the counter shaft sproket without any problem.
Dave.