Police advice is to LOCK, CHAIN, COVER
Use a disc lock to help secure the front brake disc, or a grip lock to secure the brake and throttle controls. You could also use a D lock on the front wheel to stop it being wheeled away. Make your motorcycle less of any easy option will reduce the chances of it being targeted. Combine the use of a disk lock and a chain lock attached to a ground anchor.
Thieves often steal a bike by breaking the steering lock and wheeling it away. Use a chain lock through the back wheel (the front wheel can be removed). Secure your bike, with the lock taut to an immovable object such as a ground anchor or street furniture. This will stop thieves from cutting a lock trailing on the ground using an angle grinder. If this isn’t possible, thread the chain through your bike frame and back wheel. Keeping the lock off the ground can prevent it being attacked and smashed.
Thieves often ‘shop’ for particular bike models. Using a cover instantly makes it less attractive to them. A cover also provides another time consuming obstacle for the thief.