I ordered 2 jets in the past from Tiapai scooter assassins and both were the wrong thread, despite me explaining to them exactly what I needed. After that I just took my old 80 jet out and drove over to my kymco dealer to buy one there, meant I was able to physically compare the threads to be sure they were correct.
I run with an 82 main in my A50 and that is just right on my scoot, checked the plug and its all good. It was running too rich before I drilled 3x holes into my stock airbox to trt get more air in. It actually worked out good and now its perfect.