Mine does that as well when cold, don't worry about it. I think since the whole valve and oil consumption thing everyone is scared to death that their CRF is a ticking time bomb. Feel good, I'm sure its fine. I got the 02 model and have had no trouble w/it. I've had no valve problems(although I do service them when required), it uses a small amount of oil(its a small capacity unit, its just more noticable than other bikes), and (properly jetted) I've never had a problem w/frying the motor. Don't sit around the garage and worry.............Go Ride The Thing!!!!;)