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You most likely need to synchronize the carb to the magneto. First make sure the cam follower roller just starts to open the carb butterfly when the manifold pointer (just to the left of the roller) points to the mark on the cam. Adjust by loosening the throttle arm clamp screw and adjusting the eccentic screw to make it so. Once that is properly adjusted, rotate the armature plate to its’ full spark position and adjust the control rod collar (loosen the set screw) so that it almost touches the pivot pin (about 1/32-1/16" clearance). This should happen at about 2/3 throttle. Then tighten down the collar. Now, with the magneto fully advanced, further rotation of the throttle will push the follower roller away from the cam (via the fuel saver rod) until the carb butterfly is fully open.