Which rider from the 1971 Isle of Man Junior TT 250cc final standings had a speed equal to 86.15mph?
CREATE TABLE "1971_isle_of_man_junior_tt_350cc_final_s" (
  "place" real,
  "rider" text,
  "country" text,
  "machine" text,
  "speed" text,
  "time" text,
  "points" real
);
SELECT "rider" FROM "1971_isle_of_man_junior_tt_350cc_final_s" WHERE "speed"='86.15mph';