ok i have a drive shaft 250ec and as you might know the axle is shorter on one side of it. when i wheelie it drifts to the left. it that because the ride half of my axel is shorter??? ( tire pressure is the same already checked)

 

It goes left huh...........

Tire pressure / swingarm / weight transfer are the only options when it comes to drfting or turning the bike in a wheelie. Air up the left side a little more that will stop it - or try leaning to the right side. If you aer using your feet on the grab bar, switch feet and see what happens.