I cant tell you if it would be worth it or not for your particular set up, but the price is half of what it normally goes for as you will see in link below from s reputable dealer, "bicycle-engines.com"...As long as the seller on e-bay is honest and reputable, the price is more than just alright...Keep in mind though that the one im showing you is more "complete"...If im correct, your intake to the engine will have to be a 40 mm intake whereas many china girl engines tend to be 38 mm intakes...DAMIEN
Dio Reed Valve and CDH POWER cylinder setup for 48cc/66cc/80cc;. - A little porting on the intake side only;fully 100% CNC machine processing on cylinder and block;. CDH POWER Cylinder is ported a little by machine on the side of intake;.
www.ebay.com
Links to eBay may include affiliate code. If you click on an eBay link and make a purchase, this forum may earn a small commission.
Wouldn't waste your money. Those dio reed cylinders are famous for air leaking behind the block where it attaches to the cylinder. A G2 reed valve is the way to go.