2008, the tenth number of the VIN tells the model year
JY4= Japan, Yamaha, ATV
3GG=Model Banshee, should also tell the displacement but it's not correct
0= Emission Code if 0 it's an internal Yamaha code
0= Non Competition
0
8= 2008
0=Assembly Plant San Paulo, Brazil
250314= is the Assembly number
The 3GG on the cases means they are Banshee cases and not RZ or whatever the other twin motorcycle motors were.