So, I'm guessing it had a 50cc to 110cc 4 stroke before?? You can get a 125cc pit bike engine, kick start, for around $300+ dollars shipped, seen 110cc on eBay for $237 and $49 shipping. Most come w/ a carb and front gear, #520 chain & gears. Welcome aboard. I have a stock 110cc, X18 exhaust almost new in a box, I modded slightly. Would cost alot to ship it, $20 or $30 dollars. I put a $69 X12 HP side pipe on it. Pocketbikeparts in Florida, $100 gets you free shipping, you could get gears, chain, and all that stuff. They have a phone to get the right parts and they have an X12 Icon on the Main Page, scrool down click it on and all the stuff you need in one place.