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Yes, it could, but only if fuel is not restricted to flow through the several jets and passages.
The needless don't do much for start ups, they are more influential at middle range.
It seems that your fuel restrictions are for the idle and choke circuits.
Checking the flow through the petcock won't hurt, just in case you have restriction due to filters or poor vacuum.
When the air is cooler, the mix gets more air than fuel and burns slowly, producing that boom while the exhaust valves start opening.
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Motofool 
.................................Never ride faster than your guardian angel can fly
"Mankind is composed of two sorts of men — those who love and create, and those who hate and destroy. Love is the bond between men, the way to teach and the center of the world." - José Martí
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