Originally Posted by csmutty
Have fun maintaining that motor...
I use to race a motard and the yz is the least competitive motor out of all the 450s.
This conversion looks to be on an 06-09 YZf, as the 2010+ would likely be a huge challenge to do, with the backwards motor and flip-flopped intake/tank etc. Anyhow, even the 06-09 YZf motors are the most reliable (as are the 2010+), so not sure what you are referring to. And the Suzuki 05-07 motor was easily the softest motor out there, not to mention it's 4spd gearbox.
That being said, no reason an 06+ YZf couldn't be competative in SM or in a conversion like that, in my opinion.