by crfsonly » Sun Apr 10, 2016 11:22 am
All X models for all states come with emissions now and have for years. Some don't need it for close-course riding/racing so they remove it to save weight with a block off kit. If you have already done so then the R head will work. We have them with our CNC work and Kibblewhite Stainless Valves. Great set up.
Hot Cams makes Stage 1 (low-mid range cam), Stage 2 (like the R cam with a bit more power). R cams of the same years will work ('04-09). The '08-09 cam is generally accepted as the best of the lot for use with the X. With our '07 KW R head, the '08 R cam or the Stage 2 Hot Cams cam and a higher compression piston with the pink wire mod you'll get more power everywhere and will be very happy with the results.
Ken