hi guys i'm seriously confused right now cos i'm going to make a decision to decide whether should i keep my yz400f and upgrade the components or just buy a used yz426. here's the story.... i'm saving up to get a yz450, but due to unforseen circumstances i used most of the money on a family emergency, so i'm left hanging with my YZ400f. As i was thinking of selling it away to get a used 426 ( thats all i can afford) some one posted this site... http://www.powroll.com/P_YAMAHA_YZFWR426F.htm and i realised that i have enough money for this!! from a 400 to a 444cc WOW thats amazing. so now i have a buyer waiting for me to sell and a 426 waiting for me to say yes and also a deadline for my decision!!! Now every minute my heart is swaying to either bigbore kit or 426.... i'm ging crazy!! pls with you bros experience in the bike, help me analyze and make a right choice that i will not regret. i'm going to use the bike for local track days and will be chasing after a lot of crf450 and 450s..... so needs serious advice. thanks! sorry for the nagging..