@bikerdoc

I agree - they seem to be BMWs or Honda STs. I once saw some white Honda ST-like bikes being ridden by the police around Tiananmen Square, on regular duty. The bikes had very little badging, except for "Honda" and "800" (presumably the displacement).

The 1982 pic seems to show jugs that hang out on the side (BMW or CJ style), with the exhaust header coming out from the jug. But the forks & headlight appear somewhat Japanese (although probably unlikely in 1982 China).

@Culcune

Interesting trivia tidbit ... prior to the series starting production, Ponch (Erik Estrada) had zero experience with motorcycles. Further, Estrada never had a motorcycle endorsement on his driving license for the entire six year production run of that series. After the series ended, Estrada needed 3 attempts to finally get his endorsement.