i walked into the local yamaha dealer today to pick up some parts for my yz 125. they have a brand new 11 450 for 6500 that caught my eye. i thought o what the hell and filled out an application and i got approved yay! i told the salesman i would think about it overnight do these bikes have any known issues or problems with the motor? i really like 450s but i bought a used 08 crf and it lasted 10 months before exploding. i'm just scared of making payments on a broken bike. i really want this bike now but the 4 stroke bug left a bad taste in my mouth. if anyone has had any issues with this bike please share the information with me.