What kind of motorcycle did Chris Mitchum ride in the movie "Big Jake" (1971)?

The motorcycle that is supposed to be an Indian Scout is a mid to late 1960s Montesa, possibly an Impala 175 Cross or a Cappra 250 that is modified with bicycle style handlebars and a box tank to look similar. The 1909 Indian Scout had a bicycle style frame with no suspension and narrow bicycle style tires, unlike the motorcycle in the film with telescopic forks hidden behind the rifle scabbards. The Indian Scout would have had either a single cylinder leaning to the rear or a V-twin arrangement, unlike the inline two cylinder leaning toward the front on the movie motorcycle. A kick starter is visible, which was not available, as it started by using the bicycle pedals on the Indian which are not present on the movie Montesa. Due to no suspension, jumps as were made would have resulted in crashes with a 1909 Indian.