Moped won't Start

My moped is a 1978 Garelli Super Sport XL. I recently took off the gear box cover by accident when i was messing around with it, I put it back on and put the correct oil in, i think, and now there seems to be no compression. When I measured the compression it was only reading about 15-20 max. The plug sparks great outside the cylinder. When i put the cover back into place, and tried to start it it will not turn over, AT ALL, there is no reaction in the engine at all, but i think the cylinder is still moving. Maybe the plug isn't sparking inside the head, or the clutch is slipping when the pressure begins to build. when I pedal it seems a lot easier to pedal then previously, leading me to think of a compression issue.

-Any help is appreciated.

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