Emerging market assets have gotten cheaper, but in the face of four key headwinds, it might not be the right time to buy back in, Barclays said. "Although emerging-market risk premia generally fell in 2002-07, they rewidened last year in anticipation of the end of QE (quantitative easing). In some cases, such as some fixed income markets and especially in equity markets, that rewidening remains tempting," Barclays said in a note Friday. "But it is no longer obvious to jump back in." Emerging markets face four key headwinds to regaining momentum,Barclays said. Firstly, China's economic growth slowed from its average of 11 percent annually over 2002-07 to just 8.2 percent over 2011-13, it noted, adding it expects a further slowdown in 2015 to around 6.9 percent.