Been working on my girlfriends riding mower. Gas in the oil, so I changed the carb with one I had in stock. New plug, adjusted valves, new starter, still will not crank past compression. With the plug out it turns really slowly. The voltage in the battery drops to 6 volts while cranking with no spark plug. I get 12 volts into the solenoid and .5 volts out if I tested correctly.