Hi Brenden, You can not register the bike under your name if you don't have KITAS. As a foreigner, you need KITAS to register the bike. However, as you mentioned, you can leave the bike registered under the previous owner's name and as long you have the document of ownership with you, you'll be fine. In fact, many people when buying used vehicle, tend to leave the vehicle under the previous owner's name and only transfer it to their names when they need to pay their annual vehicle tax. As for will you run into problem leaving the country with "other people's bike"... I don't know the answer to that ...and can only speculate. I would think that if you have carnet and the document of ownership (BPKB and STNK), you won't have a problem. But , as I said, I do not know for sure. Now, TE 630 subframe mod ... instead of welding, what about doing a subframe modification like CJ Brown "browneye" did? I haven't done the modification myself cause I don't see a need to do it... but if I ever need to, I would do CJ's subframe mod.