hey guys. please forgive me if this is a stupid question but i'm very new at riding. first off, i broke my new 2006 KX-85 in pretty hard. i read that i should change my crankcase oil soon after riding for the first time to be sure there are no metal shavings from the piston getting into the engine. can someone please run the steps down for me on how to properly do this & what type of oil & how much i should re-fill into the crankcase. thanks very much guys. Carmine.