Easy Wheels

Far left in first:

Honda CB 500-550/4

The bike of Wendy the waitress when she joins the men's gang to take out the women's gang:

Suzuki GS 450 TXD, 1983.

Kawasaki KZ 400 B, 78-80.

Leader of the women's gang:

Kawasaki EN 450, AKA 454 LTD, 85-90.

Bruce the reporter is saved by the men's gang and this is the bike he uses when he joins them: Yamaha RX 50

https://www.bike-urious.com/raffle-only-mini-cruiser-1983-yamaha-rx50/

Possibly Yamaha SR 250.

Seen at the beginning and end of the film, and only in close-up, post gang war with Bruce and Wendy:

Confusing model, indications are FLSTS Heritage Springer, introduced in 1997, FXSTS Softail Springer was introduced in '88 but stuff like light bar, heavy valanced mudguard, brake caliper etc are wrong. ???

Leader of the men's gang

Honda VT 500 Ascot, 1984.

Honda XL 250-500 S, 78-81 (250), 79-81 (500).

XS 400 Special II, 80-82.

Yamaha XS 650 SE or SF, 78-79.