This might help, might not. For the last few years ive been racing a CR500 (wonderful bit of kit) The easyest way to start that is turn fuel on, full choak, lean the bike over and wait for a pool of fuel to drain out of the carb overflow... stand the bike up... kick it though a few times then let fly with one good kick! 99 out 100 times she'll fire.
This isnt just my bike and most people with CR500's do it this way. If you leave out the flooding the carb bit they are a b**ch to start. I would seriously try this method.. you never know, it does work