Cold/ warm cylinders

Hello again

I have an issue… bike in all back together.. I noticed today it starts ok but the front Right and rear right cylinders ( as you sit on bike) are cold/warm nice spark from the plugs, fuel in the bowls.. what I did do while the engine was running I manually opened the chock on the front right carb and the revs increased and the exhaust got super hot instantly which it’s don’t do when you rev it normally… then it goes warm again… very odd.. carbs are spotless and refurbed. Any ideas peeps. Thanks.

How were the carbs synced?