SCHEMA:
CREATE TABLE table_name_81 (time VARCHAR, rider VARCHAR, bike VARCHAR, grid VARCHAR)
USER:
What is the time recorded by David Salom on his Yamaha yzf-r6 when his grid was larger than 1?

QUERY:
SELECT time FROM table_name_81 WHERE bike = "yamaha yzf-r6" AND grid > 1 AND rider = "david salom"