Hi,
I have SJ410, year 82/83, not sure. It had originally AISAN carb, type 80300, images of that carb are here:
https://1drv.ms/u/s!AhPMPT8r2PSOgyGJMvOOqmWIP1rY?e=E0qSuO.
I can not find replacement carb. I found a newer type on ebay/aliexpress, but it is different. It fits but it has some kind of vacuum advance and some ports that were not on the old one. Image here:
https://1drv.ms/u/s!AhPMPT8r2PSOlyvfwB8envJpcEGdI tried to tune it, but car has no power if you pull hard. I tried to plug the port number 2, but no difference. I checked the accelerator pump but it squirts fuel just fine. I searched all over the internet but found nothing. Can you please hlep me? I really need the car running.