I changed my CCT last week with an OEM one and it worked perfect. Now I'm hearing a sound when I take off in first and second too. It's a very soft chirping sound. I only hear it in low rpm's in my first two gears and it goes faster when I go faster. It doesn't happen while sittng still. The sound is not very loud and it's not coming from my forks. It really sounds like birds chirping....

I am posting this in the tech section too...

 

If you are sitting and you rev the enigine do you hear it?

 

is your drive sprocket OEM?

 

It's either going to be a bearing, brakes, or the chain. imo

 

no I must be moving to hear it...
everything is oem

 

Hopefully is not your chain. Lube the heck out of it & see if it stops. If that's what it is it'll more than likely need replacing because it's probably metal to metal contact.
Chech your brakes and see if they need replacing. When they reach a certain point, there's a little metal tab that begins to screech, alerting you to replace them asap. Also, disk brakes have a tendency to become noisy if they're dirty (brake dust). Blast them with brake cleaner.
Then finally I'd check the bearings. You''l have to pull the wheels to check those.

 

+1 dirty disks or bearings.