replacing 400ex clutch, quick question

[05trx400exridr]

I'm in the process of putting fresh discs in my 2005 400ex clutch. This is my first clutch I'm doing myself and it seems pretty straight forward, except for one thing. A while after I removed the right side engine cover I noticed a small machined washer sitting on top of my skidplate. Its about 1" O.D. and I'm pretty sure it fell out when I removed the right side cover. Anybody know for sure as to where this came from?

[John451]

if you know what it looks like to to www.bikebandit.com and click OEM parts then go down and click on honda then click 2005 then go to trx400ex then go to the right side cover schematic page and try to match it up with any that look like it... Im not too sure what it would be from other than from the thing that holds the clutch springs on, between that and the little thing that pushes the pressure plate