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what mix ratio ( mercury 500 cc, 50 h/p, 4 cylinder,1973 year)

Always 50 :1 -------you need to check on the year of the motor again, I do not believe it is a 73.------------------Where are you ???-----------------------Canadian / european / american # could be different.-----------------Post a picture to see what year it is !!
 
I'm in united kingdom (europ) cant find how upload picture ... s/n 9007738 ... engine made in belgium
 
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That serial # certainly is not for the North American market.------------Motor is a 500 model, does not refer to 500cc displacement.
 
so, how I can find year of my engine... probably its for europ market.... many thanks... I try attach pictures... maybe its help... P280511_14.320001.jpgP280511_14.310002.jpgP280511_14.320003.jpgP280511_14.320002.jpg
 
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