This will vary by insurance provider and also by the engine size of the motorcycle. Please check the activities covered in the policy wording. If motorcycling is included there may well be additional criteria that you have to meet, for example holding a full motorcycle licence or only if you are riding your own motorcycle. It’s always a good idea to call the insurance provider to be sure what is covered in relation to your planned trip.
Track days, racing other timed events are not covered by travel insurance.