Sounds like a 110cc, 107cc in real life. You could get a 125cc kit, 114cc real size, rebuild cylinder & piston kit for as little as $75 online, try morethanhundreds on eBay, MBPN, minibikepartsnow online. I got mine there for $50 and $25 S/H about a year ago. Has a higher compression piston than stock, comes with gaskets and all. If you going to rebuild might as well go bigger it's the same price. Can't go any bigger with that engine, the new 125cc-160cc are a bigger engine. Also found a new head for $36 to my door on eBay, complete, w/ valves, rockers and all.