This weekend at Pismo my nephew was riding his moms 2004 400EX and said it just stopped moving. He got towed back to camp and i found it has no forward movement. It feels like it’s shifting and doesn’t make any noise when you let out the clutch. Can it be that simple that the clutch just failed with no warning? It ran fine, didn’t slip that I know of. Just cant believe that it just randomly failed with no warning.