Mystery arm, right side of engine

[Drfat400ex]

Hey guys, havnt been on this site in forever..
Anyways im changing the crank seals, balancer shaft seal, and balancer shaft bearings on a friends '07 450er, as i was about to put the gear on the crank for the counter balancer, something fell from where i dont know and onto the floor. This is what it looks like and i think it came from around the starter clutch area. I looked through diagrams on partzilla and at pictures i took while tearing it down and cant find for the life of me where it came from, any help would be greatly appreciated.17181088141718108814

[racer82]

Looks like its the decompression arm off of the cam

[blacknblue#2]

Bingo. Its the "weight" of the decompression mechanism. Im sure the spring is long gone too. Was the quad starting fine? I know you can run the 400ex without the decompressor but i tried taking one off a 450 years ago and kicking it was impossible.

[Drfat400ex]

Thanks a bunch guys thats exactly what it was. Still not sure why it decided to jump out of there but luckily the spring and washer are still there:cool: