Hi, i was out riding tonight and towards the end of the night (after an hour riding). when i was hitting the 90ft step up in 3rd gear pinned (the lead up was rutted so the bike got revved out sort of fast) the whole night i was hitting it no probs and the bike sounded fine and would rev out okay. then at the end it sounded like it had no fuel, as if the fuel line was clogged so i pulled off and revved up my bike and then it wouldnt take full throttle and would not hit the rev limiter but make a weird sound. at 3/4 throttle it would hit the rev limiter.. im not sure if i need to re-jet a little, im not sure where to even make minor adjustments even, do i lean or richen? or maybe it was a dirty air filter? i only put an hour ride time on but it was a failry dusty day? i have been told before that on a straight when i chop the throttle it does backfire a little - are these 2 things related? advice? thanks also: i have never had a probelm with bogging even after riding in the sand for an entire day??