* Yen rises on Japanese exporters' month-end bids
* Euro off 12-week high but supported by dollar weakness
By Hideyuki Sano
TOKYO, July 30 (Reuters) - The dollar fell to an eight-month low against the yen on Friday, hurt by selling from Japanese exporters and concerns that U.S. GDP data would add to signs of fading momentum for the U.S. economic recovery.
In Asian trade, the dollar's fall was primarily driven by month-end selling from Japanese exporters, which overwhelmed buying from several new Japanese investment funds launched on Friday.
"At the start of this week, it looked like there would be an end to the dollar/yen's downtrend but now it looks as if there will be no change and it is set to end the month of July lower," said Kakuya Kojoh, the head of securities department at Nissan Century Securities.
"The dollar will likely test 86 yen. It could even fall below 85 yen next week."
Dollar bears are looking to U.S. second-quarter GDP due at 1230 GMT as a further opportunity to sell the currency, with economists forecasting growth to slow to 2.5 percent in the three months to June from 2.7 percent in the first quarter. [
]The GDP data will be followed by U.S. manufacturing and job figures next week.
"Today we saw some month-end flows, in both directions, which dictated price moves today. But when the dust settles, the market will focus on economic fundamentals," said Hideaki Inoue, manager of forex at Mitsubishi Trust and Banking.
The dollar fell 0.4 percent to 86.49 yen <JPY=>. Earlier, it hit an eight-month low of 86.25 yen on trading platform EBS.
The yen took in its stride comments by Japanese Finance Minister Yoshihiko Noda saying he was closely watching the foreign exchange market, as well as remarks by Deputy Finance Minister Motohisa Ikeda, who said he was worried about the impact of a rising yen on the country's exports. [
] [ ]Market players have said they will not seriously expect Japanese authorities to intervene to stem the yen's rise until the yen rises to 15-year highs beyond 84.82 yen to the dollar, and that the yen's rise would also need to gain more steam and a slide in Tokyo shares would have to deepen. [
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The yen rose broadly, with traders citing speculation about the potential for fund repatriation flows into the yen related to redemptions of Spanish bonds. [
]There was also some market talk that Japanese retail margin traders were buying back the yen, or may do so, on Friday ahead of the implementation of a new leverage cap starting on Aug. 1, when maximum leverage will be capped at 50 times collateral.
Any retail investors that have been using higher leverage, such as 100 times or 200 times collateral, would be forced to exit their positions if their collateral is found lacking once the switch to lower leverage is implemented next week.
But since the bulk of traders using such high leverage are thought to be day traders that close out their positions during the day anyway, margin brokers and analysts have said the chances of large-scale position unwinding emerging next week seem limited.
The dollar has been hobbled by worries over the U.S. economy, after a raft of U.S. economic data in the past month undershot market expectations.
St. Louis Federal Reserve Bank President James Bullard said on Thursday he was worried about the risks that the United States could fall into a Japan-style quagmire of falling prices and investment. [
]Although his comments had only a marginal impact on the currency market, some traders were surprised by the candid tone.
The euro dipped 0.1 percent to $1.3065 <EUR=>, but was not far from a 12-week high of $1.3107 hit on Thursday, when data showed a jump in euro-zone economic sentiment to a 28-month high and a decline in German unemployment.
The dollar index <.DXY> stood at 81.577, just a hair above a three-month low of 81.488 hit on Thursday. (Additional reporting by Masayuki Kitano, editing by Charlotte Cooper)