98 WR400 with no compression

Hey everyone, I have a 98 WR400 with no compression at the kick start. I road the bike to school this morning and it started in the first kick, like it always does but made a funny rattling/clanking sound that went away after about 3 seconds. About 3 hours later, I went to ride home and it would not start. There was no compression. I thought the compression release may have stuck open, but it is not binding. What do you guys think? This same thing happened a week back but after a few kicks compression seemed to come back. The reason I come to you guys first is because this is my first bike and I am kind of new at ripping the thing apart to diagnose problems. All your help is greatly appreciated.

Sounds like a possible stuck valve..........

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