mine is a crazy pain to hit second on the up change,, if you flick the power and try to short shift to second it almost always hits netural !!!!!
I think the tourqe load is to much in the low gears!!! there is a lot of pressure on those gears.
shifting quickly with out useing the clutch is the way to fix it,, as long as you get it rit its a smooth change,, and believe it or not its better for the box,,, the clutch is only for take off and controling the power in a set gear in tricky situations,,, and even then you only feather the clutch,, pulling it rit on and off again slams those gears and there mounts, there is a lot of play in gear boxs calld back lash,,,, my little rave,,,also I just put some ITP 22-10-11 on my rears and holy shit what a change,,, its amazing for fast trail riding,,, the bike will drift like a 450r then pull back into control as soon as you shift you weight on the seat,,, its increased my riding speed heaps