*Nikkei down 2.7 pct after gaining 10 pct previous day
*Investors wary before BOJ decision, 3-day weekend
*Carmakers hit after Mazda, Mitsubishi cut forecasts (Adds details, stocks)
By Elaine Lies
TOKYO, Oct 31 (Reuters) - Japan's Nikkei average share slipped 2.7 percent on Friday as investor nervousness before a Bank of Japan rate decision led to profit-taking selling, with carmakers like Honda Motor Co <7267.T> hit by gloom about their prospects. Though many exporters suffered after the yen edged up slightly against the dollar, not all were sold, with Canon Inc <7751.T> and Advantest Corp <6857.T> rising.
Expectations are high that Japan's central bank will join the wave of rate cuts by countries including the United States and China to lower its already rock-bottom interest rates, but investors still moved to lock in profits after the Nikkei surged more than 10 percent on Thursday. "There's a bit of a tug-of-war going on, since investor sentiment has changed slightly on the sense the market may have bottomed out for now, and people are willing to buy," said Tomomi Yamashita, a fund manager at Shinkin Asset Management. "Though the impact on the stock market would be terrible if the BOJ didn't cut rates, we have to consider the risk they might not. Expect selling until the decision is out, then a jump if they cut rates, then perhaps more selling."
The benchmark Nikkei <
> had shed 245.64 points to 8,784.12 in active trade after rising almost 2,000 points over the previous three days. It has lost 22 percent so far this month and 43 percent this year.The broader Topix <
> lost 1.7 percent to 883.88.Trade was brisk on the Tokyo exchange's first section, with 1.19 billion shares changing hands, compared with last week's morning average of 986.5 million.
The central bank may halve its key interest rate to 0.25 percent as Japan feels the effect of the crisis spreading through the country's key export markets. It may also announce other measures to support financial markets. [
]Perhaps strengthening the case for Japan's first rate cut in seven years was a dip in annual inflation to 2.3 percent, as oil prices <CLc1> slide from record highs earlier this year. [
]Many in the market thought a rate cut was virtually a given.
"They want to send a message of coordinated international action about the poor economy, a message that is extremely important for markets," said Yutaka Miura, a senior technical analyst at Shinko Securities.
But others said the positive impact of a rate cut could well be limited and that having exhausted such a major potential factor could lead to selling anyway.
"Plus, if they cut rates this will mean they've done virtually everything they can," Shinkin's Yamashita added.
CARS CRUMBLE
Investors are also nervous about holding positions over a three-day weekend, with Monday a holiday in Japan. On a long weekend in September, Lehman Brothers collapsed.
Most automakers were suffering, with sentiment dented by Mazda Motor Corp <7261.T> and Mitsubishi Motors Corp <7211.T> lowering their profit forecasts on Thursday, joining Honda in predicting bigger falls in profits this year.
Nissan Motor Co <7201.T> is due to announce its first-half results after the close, and they are expected to be weak due to the deteriorating U.S., European, Japanese markets and the stronger yen.
Honda lost 6.7 percent to 2,575 yen, Toyota Motor Co <7203.T> was down 1.3 percent to 3,850 yen, and Mazda shed 11.7 percent to 218 yen. But Mitsubishi Motors gained 1.5 percent to 134 yen.
Not all the news was grim, with some shares boosted by bargain-hunting at the falls.
Canon rose 11.2 percent to 3,380 yen, becoming the biggest contributor to the Nikkei 225 by volume weight. Advantest rose 3.1 percent to 1,399 yen.
Japan Tobacco <2914.T> gained 2.4 percent to 339,000 yen after raising its operating profit forecast for the business year to March by 11 percent to 348 billion yen ($3.5 billion).
Japan's largest tobacco maker said robust tobacco sales overseas and payment related to its osteoporosis licensing agreement with U.S. firm Merck & Co Inc <MRK.N> contributed to the upward revision of its earnings forecasts.
Declining stocks outpaced advancing ones, 933 to 685.
(Reporting by Elaine Lies)