I just bought an 01 YZ 426. My other bike is an 01 XR 400. Holy $hi! I had no idea what I was getting myself into. This bike is so fast and has so much low end its ridiculous. The rear sprocket on this bike looks huge. I'm wondering if the previous ownwer felt like he actaully needed more bottom end. What size sprockets do you guys run on your 426's?