* Asia shares ex-Japan up 0.4 pct, markets mixed
* Nikkei hits 4-month low as yen climbs to 15-month top
* Dollar slips as U.S. twin deficits set to explode
* U.S. Jan CPI forecast at 1.9 pct, core at 1.7 pct
By Wayne Cole
SYDNEY, Feb 14 (Reuters) - Asian share markets turned mixed on Wednesday as investor nerves were strained ahead of a U.S. inflation report that could soothe, or inflame, fears of faster rate hikes globally.
Japanese demand for yen also saw the dollar break last year's low and skid to a 15-month trough at 107.01, dragging the U.S. currency down broadly.
That in turn pressured Japan's Nikkei which slipped 0.6 percent to test four-month lows. Dealers said there was a lot of focus on the 200-day moving average at 21,031 as a break there would ring bearish alarm bells.
Other Asian markets were steadier, as were E-Minis for the S&P 500. MSCI's broadest index of Asia-Pacific shares outside Japan added 0.4 percent.
Moves were tentative with investors clearly scarred by the return of volatility.
BofA Merrill Lynch's February Fund Manager Survey found a record one-month jump in the net percentage of investors taking out protection against a sharp fall in equity markets.
Funds were rotating into cash and out of equities, reducing their stock allocation to a net 43 percent overweight, from 55 percent, the largest one-month decline in two years.
Much now rested on what the U.S. consumer price report showed for January, given it was the risk of accelerating inflation that triggered the global rout in the first place.
Headline consumer price inflation is forecast to slow to an annual 1.9 percent and core inflation to 1.7 percent, an outcome that could help calm nerves. The concern is the figures could surprise on the high side as wages did a couple of weeks ago.
"The risk seems asymmetric to me," said Greg McKenna, chief market strategist at CFD and FX provider AxiTrader.
"Even a slightly higher number could set the cat among the pigeons given the late cycle stimulus the Trump Administration is pumping into the U.S. economy."
BEWARE THE TWIN DEFICITS
In currency markets, the U.S. dollar was under fire again losing 0.28 percent on a basket of currencies to 89.453.
The euro firmed to $1.2363 and away from last week's trough at $1.2204. It was aided by expectations German GDP data later on Wednesday would show strong growth.
Analysts said investors were becoming nervous about the prospect of swelling U.S. budget and trade deficits given the passage of huge tax cuts and spending plans.
"The re-emergence of the twin deficit should send shivers down the dollar's spine," said Mark McCormick, North American head of FX strategy at TD Securities.
He noted the IMF had estimated that a 1 percent rise in the budget deficit led to a 0.6 percent increase in the U.S. current account deficit. That suggested the twin deficit could exceed 7 percent of GDP by the end of the decade, all of which had to be funded by offshore money.
"Those numbers do not bode well for the greenback in the medium term," concluded McCormick.
The drop in the dollar gave a fillip to commodities, with copper firm after jumping 2.7 percent overnight.
Spot gold edged up 0.4 percent to $1,335.01 per ounce, leaving behind last week's one-month low of $1,306.81.
Oil prices steadied for now, though concerns about oversupply were never far away.
U.S. crude futures eased 1 cent to $59.18 a barrel, while Brent futures gained 9 cents to $62.81.
(Editing by Shri Navaratnam and Jacqueline Wong)