i just got a 82 xr500 really clean but it smokes a lil. iv never owned this big of a bike and it seams like it gets really hot on the top of the head and the side of the case. like for example i liked my finger and touched the top of the head and it immediately vaporized. same with the side of the case but not as bad. is it normal for big 4 strokes to get that hot.