Any good forums for Motorcross/dirt bikes

[razer]

I'm especially interested in a forum about either the CR450 or YZ450 (I just found out they had a 450 thumper).

Anyone know of a good one? Lots of junky ones, but I haven't found one yet I want to spend time on.

[Ryan]

Go to http://www.motocross.com/ And they have good Bike fourms there.