The motor has 2 independent ignition systems.----Replace the condensers.----Clean / set breaker points.----You did remove the magplate to install / screw wires into the new coils?
Remove carburetor.---See if reeds are out of position.----One broken.---Or something holding a reed open.----Is the high speed jet inside the carburetor bowl in position ?---Is it clean ?----What is the number on the high speed jet?
Read the question 2 or 3 times.----Does spark jump a gap of 8 mm , yes or no ?----The question does NOT ask what your sparkplug gap is !----Check the reed valves !
When it left the Johnson factory there was a neutral switch in the control box.----I can not see or touch your motor.----Here it would be easy to solve this puzzle !
Replace the wee ground wire from solenoid to the block.----Find the neutral switch in the control box.----Or maybe some one took it out.----Find the wires and tell if they are connected.