Manual exploded

I need a parts manual for a PIVA brand rototiller with an MD82 engine. That's what the service technician told me it has. I think the timing is off because I moved the rototiller without the fuel pump, and I suppose it's not properly tuned. I need something to fix it. The plate on the front of the engine says... PIVA TYPE M 12 HP 12 Nº 4663 with the engine described above, MD82. Thank you for your help; I hope you can help me solve this. Thanks