I bought this engine to use on an off-road go kart project, but later decided to go another direction. I comes with a couple sets of carbs, some extra electronics and some other misc. items. I've never run it, but the PO promised it's a good engine. I can only pass that on, but will work with you if there is a problem. $100 for everything.
I'll also have a GY6 clone engine with a CVT drive and reverse gear for sale at some point in the future. It's currently in the kart and can be heard and driven if you are interested. Price is negotiable.