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But Yam US did sell an equivalent model. The 5SK model. Which, I suspect, is very close to being the equivalent of the non Yam version.6E3 also means it's a 5hp.
142346 puts it in 1985 production.
It can be challenging finding correct part numbers for this motor since it's made by Yamaha--but it's a model Yamaha didn't sell in the USA.
But Yam US did sell an equivalent model. The 5SK model. Which, I suspect, is very close to being the equivalent of the non Yam version.
Parts availability will be more difficult because of the age of the motor.