Welcome to da forums...:icon_ devil:....If you think the oil passages may be blocked,drain the oil out,install the plug back in,and add the proper amount of diesel fuel instead of oil,start it,let it idle a few seconds, shut it off,do this a few times,or until the diesel shows signs of blackness in it(which is metal,dirt,sludge that is in yer engine),then start it up,let it run a couple of minutes,shut it down,drain the diesel while the engines still hot/warm...Allow it an hour,or two to fully drain out,change the oil filter,install drain plug,install the proper amount of new wet clutch friendly oil(Honda GN-4,Rotella T6,or any atv/motorcycle spec'd oil),and let her ride...:icon_gd: