Looking for 157FMI Parts

I have a Panterra dirt-bike with the engine code 157FMI. It has transmission problems (won't shift past second gear and must go into neural before shifting into second) and I've been told it's most likely a problem with the shift forks. I'm going to tear the motor down soon and see for myself, but where can I get parts for this thing? Will Honda CG125 internals drop right in? Thanks in advance guys.

No difference between bigger brother honda clone (OHC/ OHV) in this part.
BTW CG125 never officially imported to states.
You don't mention where do u live. Sometimes from south of the border is quick & cheap solution if u spokes Spanish :naughty:

So I should look for a vertical 125cc Honda motor and get parts from that?

XL125 transmission are silmialr