Hi all, I'm pretty new here, certainly no Yammaha expert and I have a question: Is it possible to upgrade the YZ 450 to a 5 or 6 speed gearbox (a-la KTM SX 450 with EXC 6 speed)? I'm up in the air between the CR-F, YZ-F, KTM SX, and perhaps the RM-Z 450 (yeah, like everyone else in the world), and the fact that the Honda is the only 5 speed is seriously weighing my decision. I've spent time on a 426 F, and really enjoyed it. We have a huge amount of desert here, so the gearing is important. I don't really want a WR though.... Thoughts? Thanks!