ok I blew the top end on my 08 cr last fall and sent it out to e gorr for the 144 treatment. I went with the more bottom and mid, pump gas set up. After popping the top end last fall I'm a bit paranoid about jetting at the moment. Right now it is running a 40 pilot, 440 main, clip in the middle. stock tmx carb. It still seems a bit lean and I haven't done a flat out rip yet as mentioned above ... a bit paranoid about popping it. anyway riding mostly quad track so far ... really digging the bottom end, makes the bike much easier to ride. I also noticed that I was pulling 6th without any problems which it would not do before. No clue about top end as I did not go there. might be able to put a smaller sprocket on the rear now. I really really really want to open it up and see what its got on top. Hopefully I can find a 450 main and maybe a 42 pilot this week. I changed out the springs front and back to lighter springs so that made the front end a bit better. my first impression is it is a worth while expense. need to get it into the techy stuff and get the suspension sorted this could be a really fun bike!!! In fact if I really did dig it I would grab an 09 or 10 and get the factory 144 kit ... if it did not have that dinky little gas tank .... wondering what it will do to my mpg running the bigger jets .... and wondering why I need to go up so much, it was 80 degrees today and the 440 main wasn't enough!!