How do you expect a video of them running if their missing parts?
For $85 + shipping, you could get two of these Carb-Recoil-Ignition kits...
http://www.everestpartssupplies.com...t=1097304869&gclid=CK-S2OD878oCFQ8vaQodF10HXw
One aftermarket/used gas tank (mounted high to gravity feed) should fuel both engines. If not, may have to convert to pumps, more $$...
So even if you spend $200 in shipping and parts (+ the cost of your original predator), you'll have two used GX160 for less than the cost of one new...
For $200 you can hop up that predator real well also... so which would you rather have? Two stock GX160 or a fixed up predator?
No one is going to trade you two working/running GX160s for a stock, cheap discount predator. And have you researched how to build/run a dual engine kart, or are we just jumping into the deep in of the pool?
Check out Relativity's thread...
http://www.diygokarts.com/vb/showthread.php?t=26104, one of my favorite dual eng. karts.