1970 mercury thunderbolt 650

Lennyb5641

Cadet
Joined
Jun 29, 2013
Messages
6
My motor ran great last weekend and now it won't start and is back firing through the prop, I have no clue what it can be so does anyone have any suggestions? Can someone please help me here, I don't know how to do a compression test without the gage but I don't think it's the problem, not to mention I don't really have a lot of money to have it checked out! Ok I just checked and its getting good spark to all 4 cylinders, please if anyone can help me!!!
 
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