Just installed an engine kit I purchased on Amazon. I have no spark. I have tried a new magneto and 2 different new CDI's, 2 different new spark plugs. The resistance on both magnetos is right around 340 ohms. The magnet is strong. The magneto is grounded to the motor. I connected a voltmeter to both magnetos and they produce voltage. I checked for spark by grounding the plug to the engine. I also held onto the plug and touched the engine and nothing. I have been an auto mechanic for 50 years and also worked on a lot of lawn mowers. I am at a complete loss. Anyone have any insight?