wheelies

Last year, my brother making some wheelies @ Sahara Desert 8O 8) [youtube:zaaz0z8c]http://www.youtube.com/watch?v=FvE-pf9LRQw[/youtube:zaaz0z8c]

Hi, I have a 2004 FS650... 2 of my friends have the same, and we do alot of long wheelies, the 2 other bikes just got motor damage.. some say that we can't do these long wheelies cause the engine won't get oil... Anybody know if this is true. My bike still runs great and I have been doing a lot...