CREATE TABLE table_48798 ("Rider" TEXT, "Manufacturer" TEXT, "Laps" TEXT, "Time/Retired" TEXT, "Grid" TEXT)

What is the grid with a yamaha manufacturer and a +19.435 time/retired?
SELECT "Grid" FROM table_48798 WHERE "Manufacturer" = 'yamaha' AND "Time/Retired" = '+19.435'
SELECT "Grid" FROM "table_48798" WHERE "Manufacturer" = 'yamaha' AND "Time/Retired" = '+19.435'