A moped's engine may have a maximum displacement of: Do you currently have car insurance? Insurance is mandatory to drive in Ohio Yes I have insurance. But please show me your best quotes. No, please help me find the best insurance. Question A moped's engine may have a maximum displacement of: Answers 10 cubic centimeters. 20 cubic centimeters. 50 cubic centimeters. Explanation As defined by South Dakota law, a moped may have an engine displacement of no more than 50 cubic centimeters. This questions appears in the following tests: South Dakota Motorcycle Practice Test 17 South Dakota Motorcycle Practice Test 16