Motor identification

[WEEDHOPPER]

I have a motor I bought used and have no idea what brand or model or anything and I'm hoping that I can give a description and someone here can give me an idea.
It's a 80cc bottom end with az80 on the road but has a one piece 50mm cylinder any ideas on what kind of big bore kit it is

 

[wrench]

Hi WeedEater, Some pics would help

 

[Greg58]

You can check the stroke without removing the cylinder, take out the spark plug and turn the engine to TDC, using a drinking straw touch the top of the piston and mark the straw with a sharpie. Next rotate the engine to BDC and and mark the straw using the same reference point you used before. Remove the straw and measure the distance between the lines, it’s not perfect but will tell you if it’s a 38 or 40mm stroke.

 

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This has nothing to do with motorized bicycles. It does, however, sound like SPAM.