Hi im looking to buy an 04/05 era kx250f, because they are cheap around here. I heard they had overheating problems, but would they make a decent project bike for the money? Im not racing, and I only ride 3 times a month for 2-3 hours. How often to change the oil in them? 2-3 rides? if anyone has had experience with the 04/05 kxf/rmzs, can you please give me some input? thanks in advance. AND DONT TELL ME TO BUY A 2 STROKE!