Well, there is a website,
www.affordable go karts.com, they sell quite a few parts for the predator. The mounting depends whether you want to mount the engine horizontal or vertical. I chose to mount vertically. Agk sells a mount which is intended to mount horizontally. I have this mount. I modified it to work vertically by grinding it on one side so my pedal sprocket could clear it and I also had to drill extra holes in it to be able to mount it to the seat tube. I am using chain tensioner clamps to hold it to the seat tube, and two stroke engine mount blocks to space it away from the seat tube so the engine sits more in the middle of the triangle. Agk also sells a transmission that is a simple chain drive jackshaft for gear reduction, and they offer different size input sprockets so you can customize your gear ratio to your liking but it comes stock with a 22t sprocket so you have to tell them if you want 24, 26 or 28 instead. I'm running a 28t, this lowers the ratio for better takeoff and climbing. As far as carbs you have a few different options. The two stroke NT carb will fit if you get a 40mm shorty intake, you can also use a reworked stock carb but you will need to buy or fabricate a throttle linkage for it. You can also use a 19mm carb, which I am using and I think is best because it has a bigger throat than the NT or the reworked stock carb, and you don't need a linkage for it because the throttle slide is internal, in fact it's almost exactly the same as the NT throttle slide, the slide is just a little longer. You will need a manifold if you use a 19mm carb, agk sells those also, as well as complete exhausts and build your own headers. You will need a clutch too, maxtorque are the cheapest that are half decent, you see why I've got a grand in my bike lol .