try to pedal it for a little while, check to see if the plug is gapped properly (.25 should be enough)I hear the piston going up and down that's all
just try to pedal it (mine takes a bit, but itll start) give it full throttle (like braping the throttle)
it should start, if not, start by changing the plug. then the cdi then the coil.
also check the gap bwteen the coil and the cdi, a bisness card is what i use to gap it.
good luck!