I am thinking about buying a 2008 KTM 250 XCF-W and I have some questions about it. 1) I mostly do trails and single track and occasionally some tracks. Is this bike good for that kind of riding? 2) How is the low end power? 3) If I buy one I am thinking about boring it out to a 320 or a 350. Does the bore kit make a big difference in the power? 4) Does the bike have a lot of maintenance problems?