People under the age of 25 will pay more for motorcycle insurance simply because of their age. The area that you drive, your driving record, past insurance claims and even the size, age and make of your bike will all add or deduct from the total cost of the motorcycle insurance.
Restored, antique, rare or custom bikes will need special insurance for theft or damage, simply because most average motorcycle policies would not cover the replacement cost of the bike. If you have a unique cycle you may wish to consider additional insurance in the event of damage or theft of the bike.