RJ, I wish it was that new! I called Yamaha and they did a search and from the code the could tell me the following -
It came off of a snowmobile (shocking)
It is a 246cc engine
The model was an ET250C Bravo or Enticer - had to be Enticer because the Bravo did not hit the market until 1982, but used the same motor.
It was built in 1979
If you reversed the last two digits to get the year, that only works with the VINS on the sled itself. Take care