First, let me apologize for a pretty obvious question as I am sure the jump power wise from the 250F to the 450F is substantial. I did some searching on TT and google but just wanted to get some first hand feedback from those who have made the jump from a 250F to a 450F. I currently ride a 06' YZ250F and am in the market to buy a new bike. The 2012 YZ450F is what I would like to purchase, but am worried about the extra 20lbs and 20+ more HP. I have been riding street bikes for over 16 years, but just started riding dirt back in 06'. Never raced, but ride mostly MX type environments, with some trail riding mixed in. If I did race, I would def be C-Class. So basically...if I take it easy and work my way into it with the 450F should I be alright? Or should I just stick with another 250F? Thanks in advance!