Its going to be way easier to call them up and order a new motor for sure, but to truly appreciate your bike, and to save $, buy a manual (CLYMER) and build your motor your self. If you are at least somewhat technical, it will guide you thru it. I just built my motor using the book, and Im no mechanic. You can buy from the for sale section, and use the forum if you get stuck. This is the place to be to complete an engine for yourself. I built my motor with good aftermarket parts, including new cylinders for less than $1000, and what I learned along the way will help me out if anything ever goes wrong. Just my $.02!