CREATE TABLE table_204_603 (id DECIMAL, "pos" TEXT, "no" DECIMAL, "rider" TEXT, "bike" TEXT, "laps" DECIMAL, "time" TEXT, "grid" DECIMAL, "points" DECIMAL)

how many racers did not start ?
SELECT COUNT("rider") FROM table_204_603 WHERE "time" = 'did not start'
SELECT COUNT("rider") FROM "table_204_603" WHERE "time" = 'did not start'