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1979/1980
There are plenty of places to get a Yamaha 200hp outboard engine. You can try many different marina's, outboard engine repair shops or outdoor pro shops.
2005
1997
You have to check with the serial number that is on the engine.
2stroke 4 hp yamaha 6eq date of manufacture
1990
2006
Yamaha 40hp 6h4l1001833
Mine was made in 1995, but it depends. Check one of the stickers located on the motor.
I think the D is for 1990
Yamaha 8B starting in 677 is a 1979 model. That makes it 30 years old in 2009. Regards Steve