Leaving the key in an idling motorcycle is generally not recommended for several reasons:
Security risk: Leaving the key in the ignition of an idling motorcycle makes it vulnerable to theft. It takes just a moment for someone to hop on and ride away with your bike if it's unattended and running.
Accidental engagement: If the motorcycle is left unattended with the key in the ignition and the engine running, there is a risk of accidental engagement. Someone, including children, could inadvertently engage the throttle or shift the gears, leading to an accident or damage to the bike.
Battery drain: Leaving the motorcycle idling with the key in the ignition can drain the battery over time. The electrical systems of the motorcycle, including lights and other accessories, continue to draw power while the engine is running. This can result in a depleted battery, making it difficult to start the bike later.
Safety concerns: Unattended idling motorcycles pose safety concerns. If left in an enclosed area, such as a garage or a poorly ventilated space, the exhaust fumes from the idling engine can accumulate and pose a risk of carbon monoxide poisoning.
To ensure the safety and security of your motorcycle, it is generally best to turn off the engine and remove the key from the ignition whenever you are not actively riding the bike. This practice helps prevent theft, conserves battery life, and reduces the risk of accidents or unintended engagement of controls.