Hello. The other day I was installing a Boyesen water pump cover and impeller kit on my '05 yz450. I had to take off the right side case, brake lever, and kick start. I also took off the clutch cover and springs. So long story short, I installed the water cover and impeller, bolted the right side case up, put the clutch springs and cover back on, reinstalled the brake lever and kickstart. Filled it up with new oil and engine ice. Started it up and sounded fine. No leaks around the water cover. The next day I was putting some tools away and I noticed a copper washer and a small ball bearing about a 1/4 inch in diameter laying on the floor where my bike was. At first I thought it was the ball inside of the pushrod in the clutch. I took the cover and removed the springs and checked, but it was in there. Aaargh!!! This is driving me crazy. I've searched the manual to see if I can spot where a ball bearing would come from, but the only ball I can find is the pushrod ball. Does anyone have any idea where this part goes? I dont want to smoke my motor just because of a small missing part. Thanks in advance.