After further grinding of the crossbar I'm welding to the frame, I thought to myself "what use is this project if i can't modify the engine?"
So I took the jug of the a3 off and good news! ID of the con rod is 16 or 17mm and the ID of the con rod bushing is 12mm. Thank god.
Now I know I can install relatively any Tomos kit, but what about Puch kits? I'm thinking a Gila but if it's too much of a scare I might just do that Puch Airsal 80cc kit. Any suggestions and has anyone done this before? Do I have to drill out the holes for the rods that connect it to the case?