I can't tell you about ebay vendors, but the wholesalers that I use have mostly Taiwan made kits.
just bought my first two 2 stroke 72cc kits, Kymco unit came from Taiwan, the TNG unit from GY6 store.
All the 139qmb BBKs are from Taiwan- have checked vs China and they are very similar, but the Chinese units weigh a little less-- totellit youneed a very accurate weigh scale.
If you want a prebuilt drop in, why not get yourself a 150cc core unit, BBK the engine,bench tune the cvt, change the fluids, and then swap it out. You'll know what is in it and what it should do.
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