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This scene does not appear in the film
I rented the new Indiana Jones flick last week. My guess is, they wanted to use a new bike for ease of use and stunts. Heard the motor company set up the bike for the film. They sure did a shitty job making it look old.
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Does this look like a 50's Bobber to you?
What's with that gas tank? It would have looked more like a old bike with the stock tank and fenders.