not a dirt bike kinda guy. i preffer pavement. But if i could get my hands on one this would be it:
http://www.olive-drab.com/idphoto/id_photos_m1030_m1d.php
But in general 4 stroke DB’s have more torque than 2 strokers. For some heavy duty trail riding you’r in my oppinion better off with a 4 stroke. 2 strokers seem to require a ton of clutch play for tough trail riding.