I have an 09' Kx250f with a brand new head / valves / springs / retainers / seats, the whole 9. It only has about 8-9 Hours of ride time on them and I've noticed the more time I put on the bike, the louder the valve clatter is getting. I've checked the clearance and they are all in spec. Anyone have any ideas as to what would cause this noise and why its getting louder? Doesn't make any sense to me considering its all practically brand new! I don't even want to ride it for fear of failure on the face of a jump or in the air.. and everyone knows if you don't have confidence in your machine you can't ride it. Is this a normal occurrence? Any and all help is greatly appreciated!