Good bit of MZ diagnostics:
Can you start it by hand? --> Yes --> Compression is low, tighten spark plug, head bolts etc.
No --> Did it kick back and break your wrist?
Yes --> On return from hospital adjust timing
No --> Try by foot
My Ural was an utter POS and was a *** to start on the electrics, but the kicker was useless, you couldn't get your foot in the gap between bike and sidecar mounts.
Andy