Nice build, where are you going to mount the gas tank, needs to be above the engine for a piston carb. A pumper carb would work much better, the tank can be below the engine.
6/68 is the stock gearing of cags.....6/74 will give ya some nice arm pump on a cag.....My stand-up scooter has a 18/32 gearing right now.One of these days Im gonna swap the 25 tooth rear sprocket rim off my X1..With my modified CVT modded to kick in when the engines just about redlined in the lowend before it shifts got a pretty nice and quick lowend takeoff....Itll pull the lowend to near redline before variating in 20-25ft and max out topend inside of 50 feet.......Did you say 68-6? That's a ratio of 11.3:1 ... That things gonna accelerate like mad!