Motorcyclists/Motor Scooters can park for free at street meters or streets with "pay and display" machines (not parking lots) but only for the time period allowed by law (either 2 or 3 hours depending on signage).
Motorcyclists are not exempt from the parking bylaws, only from paying for the time allowed bylaw (permit parking regulations for residential streets still apply). For more information about the Permit Parking bylaw (Chapter 925), please visit the City of Toronto website.