i have a 2006 grizzly 660 that i just bought and it runs fairly smooth and good but when i get it out on the road she will cut out at 41 to 42 mph?? i ride with an older 450 foreman and she will run 53. so is it the studder box or what if so how do i cut that thing off. mine does have 27" tires stock it 26 i think.