I'm pretty new when it comes to 4-strokes but I have to change my oil on my yz450f. I read my manual but I couldn't figure out what it said to take off. I found the oil drain plug on the bottom and removed it and drained the oil like that. I know there is a filter to replace but can't find it. And is there something called frame oil? Some pictures of these things would really help me out. Thanks!