I have a yfz450 cam in my 05 with the cam mod done. The bike runs extremely strong and has a hard pull all the way to rev limiter. My problem is that when I coast down a hill with the clutch in, it will die. It also wont idle without the choke on. I just adjusted the vavles, hoping it would help, but no luck. Then I tried to change the jetting, but ended up only one needle position from where I was. What do you guys think it could be?