Engine Identification question, dont laugh.................too much

EightySeven550

Always just this close
Hey all,
I am going to check out an engine for my SJ, as much as I know about my 550s I have no idea what I am looking for in Yamahas.

What markings indicate what engine?

Any help would be appreciated.

Thanks,
 

michael950

for me to POOP on!
Location
Houston, TX
They are cast into the engines: cylinder on the sides (carb) and cases on the front left (by bendix - small circle on the flywheel cover).
 
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