How to identify year and model
 

I just purchased a dirt bike for my kids. It needs a little tlc, but its in running condition.

I am told that it is a 1991 Mx-150, but I can't seem to find anything online for this.

Is the model wrong? does it really go by something else?

Is the Year wrong?

How can I identify what it really is and is there a good place to find parts online?

Thank you,

Steve