The Bank of Japan left interest rates unchanged Friday as its chief said the central bank still has time to assess when it needs to raise borrowing costs further, a comment that weakened the yen by tempering market speculation about another possible rate hike within the year.The BOJ stood pat after it raised the target for the overnight call rate to around 0.25 percent in July from a range of zero to 0.1 percent in an effort to dial back its decade-long unorthodox monetary easing amid signs of an economic recovery.Economic indicators have so far met with the bank's expectations, BOJ Governo…READ FULL ARTICLE