I think its a great thing your doing, I just got a 07 yz450f this summer. I haven't really done any trail riding on it yet because I'd rather be on my quad lol. That being said I would like to get on the db more this up coming season. The 450 is prob to big of a bike for me but I traded it for a crotch rocket so I didn't have much choice on displacement.
I've been kinda looking for a similar type youtube channel for sledding but no real luck.