Noise when down shifting

So I got a quick question. My bikes stock except for the air box mod. I'm having this weird chirping sound when I down shift to come to a stop. When I pull the clutch In it goes away. It's not my brakes. My guess is the air box making more sound on decel or something. It's really hard to explain the sound lol.

Just wondering if anyone else has the same chirping/wobbling sound

I'm going to try taping off the servo hole in the top of the air box and see I'd that changes anything

Never mind lol chain just needed some oil. Total noob fail. When I went to the 12t I didn't oil the chain.

Well at least you got back on here & let us know what the actual problem was......and with enough balls to tell the true story !
So good on ya mate.

Cheers.

Haha yeah it was a honest mistake on my part I should have known to lube up the chain when putting my new sprocket on.

So if anyone puts new sprockets on make sure you don't so what I did lol

No worries mate.... Also how did you go in regards to the output shaft lock nut - were you able to re-stake the original again, or did you use a new one ?

I just bent the tabs out when removing it. Inspected the threads, (looked good) re installed the same one. And peened then back together