For the last month or so I have been hearing a horrible sound from somewhere around the valves. It's a 2003 'busa. It's been ok because after warming up, the sound goes away. But lately, the sound is getting worse! It still goes away after warming up, but it's just such a nasty sound! I've put almost 13k miles on it in 6 months. It hasn't had a valve adjustment yet. But I've been doing all the oil changes and services every 4k miles at Suzuki. I just wanted to ask you guys if you think this is definitely a valve sound or do you think it might be something else. Any input would be greatly appreciated.