Here’s a close up of the bolt you’ll need to remove.
3) Using a 13mm socket, remove the bolt, and the counterweight and bushings will come right out.
For some reason, the first 2 posts for step 1) and 2) are missing.
1) Remove the airbox.
2) Remove the bolt holding the counterweight on.
Hint: Shift the transmission to Reverse for easiest access to the bolt.
And, here's a wider angle shot of the counterweight, just after removing the airbox:
(click on thumbnail for larger version)