Motorcycle racing in the USA used to be a huge spectator sport.  Big enough that they held an ST and a TT race in one weekend at the Houston Astrodome.   According to memory, the engine limit for AMA Short Track (ST) races was 250cc for 2-strokes.

Houston Short Track 1982 #87 Jeff McDaniel #79 Randy Waldrop #86 Dough Ahn #28 Jeff Haney #17 Jimmy Filice

The fastest film I could find in those days was ASA 400 (ISO 400).  The color shots here were exposed at 400.  The B&W images were exposed for ISO 1600 and pushed in processing. Read More