well if your 500 h.o. will only do 60 mph top speed something is wrong with your machine.my 91 350 liquid cooled will hit 65 mph in 2 high.i can hit 60 with 2 guys on. my machine is a 1991 polaris 350 4x4 two stroke liquid cooled stock atv.i have raced 500h.o.'s and have walked away like they were standing still.i think my quad weighs 648 lbs so it is not light .has metal racks front & rear 25-8-12 fronts ,25-10-12- rears.[img]i/expressions/face-icon-small-happy.gif[/img]