hello all. i just bought my first quad, a 2000 mojave 250. i really dont know much about it, and would appreciate some help. how do i know if its over heating? is there a heat gauge? this is a 12 year old quad, i figure i will change the oil, spark plug, and check the coolant, but what kind of oil should i use? advice will be much appreciated. let me know what i should do to make this thing last. thanks!