Rear brake stay and expansion chamber.
I was a busy bee this weekend!
Recall that the YZ490 brake stay I was planning to use was longer than the yz465 stay (21in vs 20.25in) and this was enough to rotate the rear brake plate too far.
Solution: Mill off the end on the 490 stay, shorten the aluminum arm and then tig welded the end back on. To my surprise, the brake stay is hollow inside! It does feel pretty light.
Top left photo shows the hollow aluminum arm, trick! Top right is a flattering photo of me. Lower left is the arm after welding. Lower right photo is tab welded onto a YZ490 DG pipe I am using. I'll have more to say about the pipe and silencer in a future post.