Hi Shifty,
The GG 4t is some what based on the DRZ .
http://www.gasgasrider.org/forum/sho...ghlight=taiwan
The DRZ engine fits in the frame, the rear engine mount / swing arm pivot is in the right place but the DRz needs a sleeve in the cases for a snug fit on the GG swingarm pivot bolt.
The rest of the engine mounts need to be redone to suit the DRZ engine.
Here are a few links to similar projects.
https://www.youtube.com/watch?v=zImrG0moS1g
https://thumpertalk.com/forums/topic...c-drz-project/
My project is a long term one as I do not get much time for bikes with a young family. I hope to do a build thread one day.
Regards,
Harry