Xingyue ITA150 rebuild

[taz001]

I recently rebuilt my scooter with new: crank, rod, pistion, rings, wrist pin, and cylinder. It turns over, seems to have compression, I took the spark plug out and grounded it against the valve cover and it has spark. Took the carb off and squirted starting fluid down the intake. Just won't start. Not even a pop. Exhaust dosen't seem to puff out the exhaust stroke as hard as I think it should. Maybe even has a little "suck" to it. The old piston came off the rod and I'm assuming slammed against the head, as evidenced by the bent rod. I didn't take the old valves out of the head and check to see if they were straight. I'm gonna do a compression check, as soon as my 10mm adapter gets here. What kind of number should I get? 20, 30, 40, 50, etc. psi? The rings haven't seated yet, as I have yet to have it running. Bad compression, I'm thinking bent valve(s), good compression I'm thinking timing. What say you?