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Talking about pistons reminds me of something that happened when I ordered new pistons and rings on ebay. I looked up part numbers on marineengine.com for the 1960 model 15032 (18hp) and found #385338 (piston std). The part numbers for rings on marineengine.com was not recognized as valid part numbers, so for some reason I ordered ring set #378415 (rings std).
It turned out that the rings I received (3378415) had 3 rings in each set, and they did not fit the pistons I had received, which only had 2 grooves. In addition the two grooves were different. The upper was slanted. The rings I received did not fit the pistons. So I had to find out what pistons I had become from the seller. After some searching on marineengine.com I found out that some later models 18hp around the year 1970 had only 2 rings. I found out what the part number those two rings were, and ordered them. They did fit my pistons, so now I have installed pistons #385338 and two rings on each piston (It might be #383473, but I haven’t made a note of the part number, so I’m not sure).
Long story short: I now have pistons in my 1960 18 hp with two rings on each piston, and they fit in the cylinders. Now I wonder if this could cause any problem like the engine does not start?