If I leave my Amazon Estate for a few weeks it always takes about 20 seconds of churning to get it to start. I have accepted this as normal. I think others will have a similar story. It does prefer full choke for this initial start but you can quickly juggle it back to about half for a few minutes. It's important to have the first fraction of choke adjusted to give you an increased 150 or so revs but with the jets fully back up. That helps driveability for the first couple of miles from cold. This choke setting is covered in the manuals but often not done properly.
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