TOKYO, Aug 25 (Reuters) - Japan's Nikkei average drifted lower on Tuesday, hit by profit-taking after surging 3.4 percent the day before, with investors finding few reasons to buy actively before Japan's Aug. 30 election and U.S. economic data. Exporters lost ground after leading Monday's rally, while Mitsubishi UFJ Financial Group and other banks fell in the wake of losses in their U.S. peers. The benchmark Nikkei lost 0.8 percent or 83.69 points to 10,497.36, while the broader Topix shed 0.5 percent to 965.11. (Reporting by Elaine Lies)