Timerider

As the film opens, the title character - Lyle Swann - is a well-known dirt bike racer who is in the desert testing a new prototype linkup between his bike and helmet. When Swann accidentally goes miles off course he stumbles across a time travel experiment that utilizes two "cannons" that fire temporal energy to send each other back in time. Swann gets sent back to 1877 but rides off before the time cannons can return him to the future... (wikipedia)