My 06 Foreman 500 4x4 ES bone stock will do 55mph also. I can't get anymore out of it. 55 is perfectly fine for me. Hey, at least it's the speed limit!!!I have a 05 Foreman 500 and it is stock, the top speed I have got out of it is 55mph. I ran it 3 times all out and 55mph was the fastest it would go.