I have just bought a YZF 426, this bike is awesome. One problem I have found is that the chain tends to hit the rear tyre taking lugs off with it. I replaced the chain with a DID X ring chain but it still does it. Just wondering if anyone else has had this problem. Also the chain rubber on the swing arm is wearing very quickly, but I've heard this is common. The bike jumps very well, and the suspension is set up just right for jumping, but on the track, over small bumps under power, the bike tends to bounce a fair bit causing me to button off. I have not yet played with the suspension. Other than that, this bike rocks.