i'm not waiting any longer for a suzuki 450. going blue instead. so at about 163lbs plus gear how should the yz suspension suit my weight. i'll prob end up with about 35-40mm free sag. is this still in the ball park as i'm hearing that the 25mm setting isn't the best on the new 4 strokes. how do the yam's go in terms of valve life and adjustment if good maintenance is followed???