The Losers (1970) trailer

http://filmow.com/os-5-guerrilheiros-t116505/ The plot involves a gang of Hells Angels type bikers called "The Devil's Advocates" involved in the Vietnam War. They are sent to the Cambodian jungle on Yamaha bikes in order to rescue an American diplomat/CIA Agent (Starrett).

The biker gang is led by Link (William Smith), a Vietnam veteran and the brother of an Army Major (Dan Kemp) who has recruited them. His gang consists of Duke (Adam Roarke) also a Vietnam veteran, Limpy (Paul Koslo), Speed (Eugene Cornelius), and another Vietnam veteran Dirty Denny (Houston Savage who was killed in a road accident not long after completing the film). They are under the orders of Army Captain Jackson (Bernie Hamilton).

The gang modifies their motorcycles in a garage run by Vic Diaz. They weld armour plating with submachine guns on the handlebars. Limpy drives a three-wheeler modified from a Harley-Davidson frame with a Volkswagen rear end that is armed with heavy .50 calibre machine guns and a multiple rocket launcher from a helicopter. In order to open fire on enemy soldiers in trees or towers the gang do wheelies whilst firing their weapons. The Losers Os 5 Guerrilheiros