Plans to start work on the Shoalhaven's $15 million motor racing complex by the middle of next year are in grave doubt , because the state government has failed to embrace the project with more than words.

Motor Cycling New South Wales wants to develop the bike and car complex at Yerriong, with facilities for circuit, dirt track and speed way racing, and had hoped stage one would be operational in 2014.

Mayor Paul Green says the state has failed to really get behind the project and if something does not happen in the near future, he has threatened to take the matter directly to Premier Barry O'Farrell.

Motor Cycling New South Wales says while it is still keen to develop the complex, there have been no major developments since the project was launched with great fanfare in Nowra several months ago.