My 1872 is the same way today, but , I know what the problem is because I created the problem.
The 90 degree snorkel kept vibrating loose, so I used Locktite on the screws.
Some Locktite got on the choke shaft somehow, now it is difficult to pull the choke all the way out.
Partial choking causes the exact symptoms you described.
I keep waiting for the Locktite to wear away, but, 6 years and the choke on the SuperCub still requires a SuperYank!!
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