stock pilot is 42 I don't think 40 is a good idea.
When choke is on adds gas so going smaller on jet won't help.
When running on choke if still only on one cyl. I would look at the fireing then if thats OK a blockage like Frank said.
I learned all I need to know about life by killing smart people and eating their brains. Eat right ,Exercise ,Stay fit, Die Anyway!
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