* FY op profit f'cast raised to Y190 bln vs Y139 bln consensus
* Currency assumptions for H2 look conservative - analysts
* Longer term unclear on ebbing stimulus, Hyundai competition
* Q2 op profit down 56 pct to Y65.5 bln vs consensus Y42 bln
* Shares fall 1.9 pct before results, up 3.9 pct in Sept qtr
By Chang-Ran Kim, Asia autos correspondent
TOKYO, Oct 27 (Reuters) - Honda Motor surprised investors with a near tripling of its annual profit forecasts, bumping it further ahead of Japanese rivals thanks to a dominant motorcycle business and line-up heavy in small cars.
But Honda, the world's seventh-biggest carmaker, attributed the bulk of the revision to state-backed measures to stimulate sales and warned a real recovery in demand was still a ways off.
While rivals Toyota Motor Corp and Nissan Motor Co are also expected to report improved second-quarter earnings next week, Honda is seen making the most profit by far for the full year, helped by its more flexible operations and fewer exports from Japan, where the strong yen has raised costs.
Analysts said Honda's outlook may yet be too conservative after it lowered its average dollar assumption to 85 yen from 90 yen for the second half of its financial year to March 2010.
A weaker dollar, which traded around 92 yen on Tuesday, crimps Honda's earnings in yen terms.
"The stock will probably surge tomorrow," said Fumiyuki Nakanishi, manager at SMBC Friend Securities in Tokyo.
"The strong results and conservative views on the second half and currency rate assumptions will be positive for Honda's stock price."
However, some analysts cautioned Honda faced heated competition from South Korean rivals, particularly Hyundai Motor Co which last week beat forecasts with a record quarterly net profit.
"At this moment, Honda's real rival is Hyundai," said Kazutaka Oshima, CEO of Rakuten Investment Management in Tokyo.
"The South Korean automaker seems to be doing better, helped by a cheaper won. Japanese makers are also losing their quality advantage that could have made up for the price gap with their South Korean rivals."
STIMULUS IMPACT TO SLOW
Honda, the maker of Civic cars, raised its operating profit outlook to 190 billion yen ($2.07 billion) from 70 billion yen for the full year to March 31, 2010. It also nearly tripled its net forecast to 155 billion yen.
That topped consensus forecasts from 21 brokerages for an operating profit of 139 billion yen and a net profit of 113 billion yen.
Honda also raised its global car sales forecast for the full year by 3.2 percent to 3.4 million units and its motorcycle sales projection by 6.9 percent, to 9.565 million units.
Demand has especially been brisk for Honda in Japan, powered by generous tax reductions and incentives on hybrids such as its new Insight model, while China has also been a rare bright spot.
U.S. sales spiked temporarily in August helped by the cash-for-clunkers programme, but the impact was short-lived and followed by a sharp slump in demand the following month.
"It's difficult to get a read on what the global market will be like once the government stimulus measures expire," Honda Executive Vice President Koichi Kondo told a news conference, adding that a recovery in the U.S. market looked especially elusive. Honda lowered its forecast for the U.S. market's size in to March 2010 by 500,000 units to 10 million vehicles.
Nissan Chief Executive Carlos Ghosn also said at a seminar in Tokyo that he did not expect the market to recover the 17 million-unit level any time soon, adding he "would be happy" with 12-13 million vehicles.
Q2 HALVES, BEATS FORECASTS
For July-September, Honda's operating profit fell 56 percent to 65.54 billion yen ($712 million) from 148.85 billion yen in the second quarter last year as sales volumes fell and the yen strengthened against the dollar and euro.
The result beat an estimate of 42 billion yen in a poll of five analysts by Thomson Reuters I/B/E/S.
Net profit, which includes its earnings from the red-hot Chinese market, was 54.04 billion yen, against 123.32 billion yen last year.
For a graphic on Honda earnings, click http://graphics.thomsonreuters.com/109/JP_HNDA1009.gif
Honda's new forecasts mean profits would rise from last year despite a full-year impact from an economic crisis that drove two U.S. automakers to bankruptcy.
Shares of Honda gained 3.9 percent during the second quarter, outperforming Tokyo's transport sector subindex, which was flat. In contrast, Hyundai shares jumped 50 percent during the same period. ($1=91.98 Yen) (Additional reporting by Taiga Uranaka, Aiko Hayashi and David Dolan; Editing by Chris Gallagher and Lincoln Feast)