No, it is not possible to start a motorcycle in reverse by accident. Motorcycles are typically designed with a sequential transmission system that requires a specific shifting pattern to engage different gears, including reverse gear if the motorcycle is equipped with one. The reverse gear is not typically engaged accidentally during regular operation.
In motorcycles that have a reverse gear, it is usually a separate gear engaged through a specific process, such as using a reverse lever or button, and sometimes requiring the clutch to be disengaged. This intentional process is designed to prevent accidental engagement of the reverse gear while riding or starting the motorcycle.
Reverse gears are more commonly found on larger touring or cruising motorcycles designed to maneuver in tight spaces or aid in parking. Most standard motorcycles, sport bikes, and smaller displacement motorcycles do not have a reverse gear at all.
If you are unsure about the specific controls and features of your motorcycle, it's always recommended to consult the owner's manual or contact the manufacturer for accurate information regarding your motorcycle's operation and any unique features it may have.