Hello Everyone, I am a new 4 stroke owner. I just bought a used 1999 YZ400 on Tuesday. I fought like crazy on Tue and Wed night to get the bike started. Once I did, it wouldn't stay running. Being a new owner, I thought it was me and my lack of 4 stroke knowledge. I met two of my YZF buddies at Glen Helen on Thurday thinking they would show me the error of my ways. They too couldn't get the bike started. When we finally did, it would simply die. The bike will NOT idle. We checked things like is the choke sticking, is the fileter to oily, etc. Once started the bike will run good, except when decellerating, then if you are behind me, look out, the back fires will cause defness. If after starting the bike you aren't on the throttle, it dies. Even on the track after the bike was well warmed up, it dies if you aren't on the throttle. I tested this several times and it would die. Please offer any suggestions. I bought the YZF to simplify my life, and having to ride on the clutch and struggle to start this bike wasn't what I was looking for. One other thing to note is, my buddy discovered that the pipe (stock) had been cut open and appeared to be hollowed out. I will be replacing that this weekend. We did try changing the choke settings, and even wide open, the bike won't idle. PLEASE HELP!!!!