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Sounds like your linkage needs to be adjusted so the marks on the handle read correctly, and it advances the timing a little IF the cable isn't stretched out too much.  

You probably also need to adjust the idle mixture.  As Pappy says, it's probably set a bit too rich.  IF so, it's loading up with fuel and that's why it's hard to restart. 

I don't remember that particular motor without seeing it in person, but you have some very good helpers chiming in.

I hope you figure it out.