what year is my 6hp yamaha boat engine? Is it a 2 or 4 stroke?

Chris, I just purchased the 69th older motor from yours. 6SJ 6H6 S 007903

My understanding is that the 6SJ means 6=6hp, S=Short Shaft 15" and J=1986.
See the list at the bottom of this link.

Yamaha Outboard Parts 1986

Mine has elec start and I'm trying to find a owners manual or some info on this. I realize it's been a long time since your post. I don't know if you've already found this info or will even get this reply.
 
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