Help with model and year of my G2

Serching for information about a yamaha cart that I just bougth, I found that may be is a G2A, but I dont know the year model. Can any one help me with this?

Also I need to know what dou you think about my proyect? I want to enlarge the chasis to add 2 more seats in the middle, but I dont know if the motor HP will be enough for this.

Thanks!