Hello i was just wondering if all of the YZ 450's where 4 speed? i was wondering that because i do some motocross and a little bit more trails and i didnt think the 4 speed tranny would be good for trails?? Right now i have a YZ 426 and love it but i was going to upgrade to a 450 because i heard that they are lighter and quicker, is this true?? any suggestions appriciated. Thanks.