I have a 2000 Yamaha WR400F and a 2004 Yamaha Grizzly 660 and 4 other bikes! What other dirbikes & quads have the same acceleration as these 2? I know my WR400F is faster than a stock Kawasaki KX125 because I raced my buddy and beat him! My WR400F will do 90 MPH and it's almost stock! My Grizzly 660 will do 70 MPH and it's stock!