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To sync spark and carburetor: There is a cam plate on the magneto armature plate that opens the carburetor throttle valve. Notice the mark on the cam. Cam should just barely be ready to start opening the carburetor when cam follower aligns with the mark. Should be closed anywhere below that point and progressively opens as mag plate rotates above that point.
Make sure it is running on both cylinders. "Has spark" is nice, but is it really running on both? Remove and ground one plug wire. Start motor and see how it runs, then do the same with the other plug wire. Chances are it won’t make any difference with one grounded but won’t run at all with the other one grounded. That is the good one.