Japan's Nikkei stock average fell 1.2 percent on Friday, with Honda Motor Co and other exporters hit by a stronger yen as worries about U.S. debt levels grew after a credit agency warned Britain's rating could be cut.

Standard & Poor's said there was a 1 in 3 chance the U.K. risks losing its precious triple-A credit rating because of the danger government debt may soar close to 100 percent of GDP, adding that Britain's outlook was negative and no longer stable.

The benchmark Nikkei lost 99.80 points to 9,164.35, while the broader Topix lost 1.1 percent to 871.95.

(Reporting by Elaine Lies)