It's probably a stupid question, but you never learn if you don't ask. I've always had the guys do maintenance on my bike but I'd like to surprise them and do some stuff on my own. I have a new KDX 220. I've read that I should remove the airbox lid. Why? and where is it to remove. I should grease it up real good too. What else before I take it out? What kind of oil do you use synthetic or not? Any help would be greatly appreciated. Thanks.