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Oh we had this problem on a beautifully restored 244. It wasn't the piston what was sticking, more likely the throttle shaft. One of the two springs have had slid away and it barely rotated the shaft back into position, so you had to give a quick pedal pumping to get it back to idling. (B21A with a single carb)
back to the basics here, did you disconnect the throttle linkage when you messed with the choke?
If not, the only suspect would be the choke mechanism. disconnect the choke, and with your hand, engage and disengage the choke. It should go back to normal. If it doesnt, gently push the jet back in (just up until its seated). and make sure the cam for the high idle is not touching its screw.
If you did, did you touch the idle screws at all?
Maybe I should get new springs? I'm using generic springs from O'reighlys. Thanks for the tip!
I'm not saying it is the spring. But I think it is throttle shaft/linkage related. If only the piston goes up without the throttle being opened only the mixture screws up and the engine sputters, dies. You can easily try this out on the front carb.
check the fuel bowls, is there fuel? its it the same level for both carbs? This would also explain the sputter, clogged gross jets. or fuel boiling.
The steering shroud was thrashed and you cant find new ones for automatics, so im currently making one fron a stick shroud:
<a href="http://s658.photobucket.com/user/wtarkington/media/column.jpg.html" target="_blank"><img src="http://i658.photobucket.com/albums/uu302/wtarkington/column.jpg" border="0" alt=" photo column.jpg"/></a>
<a href="http://s658.photobucket.com/user/wtarkington/media/steering%20shroud%202.jpg.html" target="_blank"><img src="http://i658.photobucket.com/albums/uu302/wtarkington/steering%20shroud%202.jpg" border="0" alt=" photo steering shroud 2.jpg"/></a>
<a href="http://s658.photobucket.com/user/wtarkington/media/steering%20shroud%203.jpg.html" target="_blank"><img src="http://i658.photobucket.com/albums/uu302/wtarkington/steering%20shroud%203.jpg" border="0" alt=" photo steering shroud 3.jpg"/></a>
<a href="http://s658.photobucket.com/user/wtarkington/media/steering%20shroud.jpg.html" target="_blank"><img src="http://i658.photobucket.com/albums/uu302/wtarkington/steering%20shroud.jpg" border="0" alt=" photo steering shroud.jpg"/></a>
<a href="http://s658.photobucket.com/user/wtarkington/media/steering%20shroud%204.jpg.html" target="_blank"><img src="http://i658.photobucket.com/albums/uu302/wtarkington/steering%20shroud%204.jpg" border="0" alt=" photo steering shroud 4.jpg"/></a>
Looking forward to see this shroud completed, painted and installed! Nice work!