Hey everyone, sorry in advance if this is the wrong spot. I sold my CR125 this spring and just bought a 2007 KX250F, this is my first four stroke and I don't really know a whole lot about them or maintaining them but I definitely want to be on top of my maintenance. I do all kinds of riding, mostly trails, gravel pits and a bit of track. How often will I want to change my oil and filter? Is there any specific oil that's better than the rest? What other regular maintenance am I going to want to do? I've heard to do valves and get a check up done every year. But like I said I don't have a clue so please let me know of anything. I also have a bit of a problem with the throttle sticking, is there a way to fix this or do I need to replace the assembly? Thanks in advance.