Had another idea for the speeder chase. As Zam's speeder just bursts into flame on it's own, maybe an insert shot of a dashboard "check engine" light or some other indicator of trouble?
THX 1138 actually has a shot you could use for this.
http://www.youtube.com/watch?v=24R8wzYqjb0&feature=related (at 1:41 and 2:22)