* Market risk: nagging deficits, weak cabinet or no cabinet
* Analysts say centre-right cabinet most positive
* Still no clear winner, delays to hurt fiscal work
* For results of the poll click on [
]By Jason Hovet
PRAGUE, May 21 (Reuters) - A weak Czech government with no parliamentary backing to kick off reforms and cut the budget deficit are the biggest risks after a May 28-29 election, the winner of which is still far from certain, a Reuters analyst poll showed.
Czechs elect a successor to a caretaker cabinet next week and although the left-leaning Social Democrats lead in opinion polls, gains by smaller centre-right parties have complicated the outcome.
With none of the leading parties having a chance to win an outright majority, the result could be weeks or months of wrangling before the next administration takes power.
The overwhelming majority of analysts polled by Reuters between May 13-20 listed persistent budget deficits and the threat of a weak cabinet as the main risk to the country's outlook, followed by the risk of months of political bickering.
The rise of smaller parties this year has led to a number of possible coalition outcomes, from a group of centre-right parties to an incompatible right-left coalition led by the left-wing Social Democrats, or a minority Social Democrat cabinet backed by the far-left Communists.
Analysts said that while weak governments are not new for Czech politics and have been tolerated by investors before, the renewed focus on fiscal discipline in the wake of the Greek debt crisis makes political uncertainty more precarious now. "It is absolutely essential that the politicians put aside political differences and concentrate on sorting out the dire fiscal situation that has been left to drift from bad to worse in recent years," said Nigel Rendell, emerging markets strategist at RBC Capital Markets.
"The financial markets will not tolerate a repeat of the past when it's taken months for a coalition agreement to be reached, leaving economic policy paralysed."
Czech politics are fragmented in contrast to neighbours like Hungary, where centre-right Fidesz won polls in April with a two-thirds majority, or Poland, where the ruling party's candidate will likely win a June presidential election.
NO SINGLE CHOICE
The poll showed a centre-right, Civic-Democrat-led cabinet would be most positive for markets and the fiscal outlook, but only five of 16 analysts said this was the most likely outcome.
The Civic Democrats pledge to kick-start pension reforms and its potential coalition partner, the TOP09, advocates a strict savings programme to cut the deficit from 5.9 percent last year.
Three analysts said the likely outcome would be a centre-left cabinet led by the Social Democrats. Two predicted a grand coalition between the two leading parties and four saw a minority Social Democrat government with Communist support.
Nearly all analysts, 13 of 15 that answered, listed the latter option as the most negative outcome because of plans to hike corporate taxes and resistance to pension reform.
The previous Civic Democrat cabinet had taken a half-year to form after a stalemate in 2006 elections and was depleted by gradual defections that left it in the minority by the time it lost a no-confidence vote last year.
The Social Democrats led governments between 1998-2006 but from 2002 went through a succession of prime ministers, including party leader Jiri Paroubek who lost the last vote in 2006.
Czech debt levels are about half the European Union's average at 35 percent of gross domestic product but falling revenue during the economic downturn exposed years of neglect in reforms needed to avert growing structural deficits that threaten to erode the budget in the years ahead.
Parties have pledged to cut the deficit in half to 3 percent of economic output by 2013, and analysts said a centre-right cabinet would be most likely to reach this goal.
But, they said, it can't be met without a clear majority in the 200-seat parliament that can push through necessary reforms.
(Additional reporting by Mirka Krufova; Editing by Toby Chopra)