no spark..... very confused

[crocman]

So I recently built a MZ50 scooter (CPI 2001 minarelli horizontal clone). It ran great did like 60mph easily, I was thrilled. 2 days later I took it to grocery store. Turned it off. Came back and out and no spark. 

To date I have:
Tested kill switch and key - both go to ground when they should

All testing below was done with kill wire to CDI unplugged to ensure switch and key was ruled out:
Tried 2 different brand new CDI
Tried 2 different brand coil pack
Replaced pick up coil - reads 0.6VAC at cranking
Stator reads 75VAC at cranking - not replaced but tests fine
Replaced spark plug
Jumped wires from cdi directly to coil pack to ensure no pinched wires in wire harness
Added ground wire from frame to engine

I have basically given up at this point. It has been like 5 weeks. This is really bugging the crap out of me. Any help at all would be greatly appreciated. 

[190mech]

Is the engine grounded to the frame?

[crocman]

Would adding an extra grounding strap between a frame bolt and engine bolt work? I had the plug grounded directly to the battery while I was testing for spark using a jumper wire with alligator clips.

[crocman]

I bolted on an extra ground wire from the engine to the frame instead of just using alligator clips. Still no luck.