I just picked up my new CRF250x. It was a left over 05'. I'm just now starting to play with it a little bit, and I notice that there is a lot of chain slap. I notice it more when I am in a higher gear like 3rd or 4th, with lower RPMs. I checked the chain tension, and I think that it is plenty tight. Anyone else experience this, and what can I do to fix it?