Picked up my new 08 YZ450 this past weekend, got to ride it a bit. I am in the process of setting it up to suit me. It was suggested to change the gearing to a 12/51 for trail riding. Seem a bit low. Also, I will be riding some motocross with this bike. What gearing should I start out with? A Rekluse Pro has already been installed if this matters as to the choice of gearing.