Thats becuase you had a ETON 40, The 50 is the same size as the 90 and can upgraded to smoke the 90 with just a ported 70cc cylinder. You go to the track and I can almost garuantee you you WILL not see any of the bikes you mentioned there. They are just too slow!! You will see Eton, Kasea and Cobras MAYBE a LT 80 here and there.... Here is a pic of my sons bike, his bike runs side by side with his brothers KX85