Doing track day last sunday my son was on the bike. Exiting the turn on to the short shute bike starts blowing massive blue smoke. My son was on board and did an amazing job keeping the bike upright with a huge oil spill all over the rear tire. When he realized what was happening he shut the bike off right away. Well it turns out to be the o-ring between the oil filter housing and the engine a three dollar part. My mechanic says its not the best design but 10 years old how bad could it be. Anyone with an 04/05 Gen 1 might want to keep and eye on it because when it lets go its a huge oil leak. Thanks to my sons smart thinking our motor is fine but if your not so lucky bye bye motor.