Hope you guys can help.. I own a cafe racer 82 cb900c rebuild engine( taken apart cleaned pistons, cylinders and valves and put back together) , with dynojet rejeted stage 3 carbs, 4 to 1 exhaust, individual air filter pods. new boots and the idle is really poor. I makes the exact same noise at the bike on the link below. some type of misfire on the cylinder 1.. Hope i can get a few advice from you guys. Thank you!

You Tube

 

Does it smoke while it does that?

 

yes it does

 

Change your valve seals and lap your valve seats.
I had a seal go out and it was dumping oil into cylinder 4. Rough idle, cooler exhaust temperature and smoke from the bad cylinder.

 

Oh ok ok! We came to the conclusion that it was a valve problem as well. We reajusted and changed the seals. also the timing chains as well.
Thank you. I will let you know if I have more questions!