Time Riders (1991)

B.B. Miller, accidental time-traveller and Ben Hardy, a street urchin from Victorian England, arrive back in the middle of the English Civil War on B.B.'s motorbike time machine. Before their hectic and hilarious adventures are over, they're practically blown up, nearly dissected by mad scientists, almost axed to death, and then meet their worst nightmare in the evil Witchfinder General.