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Did the stop switch work before you disconnected it? If so, I can’t imagine why it wouldn’t work now…I don’t think there is a way to connect it improperly, there would be no spark if you inadvertently connected the stop leads to the coil primary connections. It is easy enough to check the stop switch leads with an ohm meter…
Using an ohmmeter on the high scale, connect the leads to the disconnected stop switch leads….The meter should read infinity, nothing less…
Using an ohmmeter on the low scale, connect the leads to the disconnected stop switch leads with the stop button depressed….The meter should read near zero ohms.
You report there is good spark, and that you are holding the choke closed….
Is the throttle advance linkage hooked up to the choke? Are you advancing the throttle sufficiently?