sometimes when its cold, it takes a couple seconds of cranking to get everything flowing properly again. that's nothing to worry about i think.
what bothers me the most is you say the choke doesn't do anything when its encountering the problems... which to me says its a fuel supply issue. that bike uses vacuum operated petcock valve so its starting to sound more and more like some kind of vacuum leak or maybe a collapsed vacuum line.
typically with intake restrictions like that, it wont really be an issue at idle unless its blocking it so much that when you try to rev it at all it just dies.
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