AHHH new bike build...no power at all.

Skyhawk 66 cc, spookytoothcycles...is what i bought and where from, also, bought a cns carb.
When it first started running...it ran great....i swear. I got on it today it ran great...i thought to myself i should go on a short ride..I'm breaking it in by the book btw. Im running 2 cycle royal purple with 93 octane at 20:1 ratio. with that out of the way here is the problem.

All the sudden no power..at all. I was going up a small hill at 8mph manually then i engaged clutch gave it a bit of fuel and killed it because it wasn't working. I thought it surely must be to much load. So i went down the hill engaged clutch..same problem no power. The engine will turn over and run as long as i pedal. when i stop pedaling...so does the engine. The engine will not idle. It did yesterday..
I called spookytooth, followed their suggestions on the cns carb..which was as follows. idle screw all the way in, air/fuel about 3 turns out. remove pink tube. I did that...no help. They said put on stock carb. Didnt work. I'm not sure its the carb. It's like it's not catching something i dunno it's very odd. Im really hoping some one will know these symtoms and be able to help.

it doesn't pedal easy with clutch engage while running it's pretty diffiult. the spark is ok. I think I may put a better plug in though this one is cheap. it does run intially it just won't stay after like 2 seconds. I'm gonna tear it down I think and check my gaskets and the head for a crack and see if that fixes it.