You're certainly not including some important factors in your post. My guess would be you're probably young. Nothing wrong with that if you are.
Are you planning on financing the entire bikes cost over 5yrs? Any down payment? Plan on paying it off sooner than the loan term?
5.5% interest makes a difference. By the end of loan, that 4000 difference between bikes drops down to about 2800. The 10500 bike costs you around 2500 in interest whereas the 14500 bike only costs you around 1300. It's around $50/mo. Difference in payments. All that said, a new bike and a 2 year warranty is worth the extra $50/mo. On a ducati. If you can afford it, the new bike is your only option.