I did some work on my bike ( 03 450 ) that required the removal of the crank case cover and the kick axle assembly came out with it. I got everything back together and fired it up. I noticed a lot of noise coming from the kick starter. I checked the lever and it seemed to operate fine (recoiled and ratchet), but I noticed if I applied some forward pressure to the kick starter the noise would go away. I did not think I had anything to worry about so I went for a short ride. After about 15 minutes of riding I heard a horrible grinding noise and felt the bike shake. I took the crank case cover off and saw that the kick axle assembly had sheared the stopper plate and bolts completely off. I have tiny pieces of metal every where. I checked the manual just to make sure I had put every thing together correctly and I think I did have it right. I checked the kick axle assembly and it seems like it is OK as well. I never had issues with the kick start before this. What could cause this? How do I get all those metal fragments out of my engine? Thanks in advance.