Ok so i will get down to the point, when i begin to ride 1st and second gear are fine, but when i get into 3rd and up and hit the throdle my z hits high RPMs but the tires dont spin and my bike doesnt accelerate like it should, so essentally i am reving it out but not gaining very much speed. My tires are ok and my bike is in decient shape. Any technical advice would help me alot. Thank you