Specify what is "cleaning the contact on the electric start". If you took the solenoid apart, you might have damaged one of the tiny solenoid relay coil wires. It's most likely directly related to the work you did. Take pictures of the part you worked on and post them here. Did you move any wires to do the work?
Does the engine crank OK when you push the start button? Did you test the fuses with a multimeter? If your spark plug is really oily it will be harder to see the spark.
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2011 EC250E
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