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Mid 1980’s Chengdu Emei 50D, GD engine
GD 1-speed engine, a Sachs 505/1A re-make
1980 Chengdu Emei 50D
1987 Kamasura Emei 500 (or 50D?)
Here is info about this Kamasura | Moped Wiki — Moped Army
1986 Chong Qing JT50A, a remake of 1978-83 Honda PA50