You actually have to post the stuff after the = in the youtube address
It would be
[youtube=425,350]mYD7lBkExj0[/youtube]
The admin says this will be fixed soon so the whole address can be posted.
I reposted the video for you, I hope you dont mind!
[youtube=425,350]mYD7lBkExj0[/youtube]
BTW sweet ass video!