The one Indian leader with a record of having spoken out over the years for conciliation and compromise with Pakistan is now touring world capitals to ask that the Government of President Agha Mohammad Yahya Khan be cut off from all forms of foreign assistance.

He is Jayaprakash Narayan, now the leading spokesman for the Gandhian viewpoint in India and, before he turned his back on party politics in 1957, his country's most prominent Socialist.

Before and after India's war with Pakistan in 1965 over Kashmir, Mr. Narayan labored for a settlement between the two countries on the basis of autonomy and self- determination for Kashmir-a stand that, he says, "earned me intense unpopularity in my own country."

Now Mr. Narayan, who is 70 years old, has been trying to generate international outrage over the denial of self-determination to the Bengalis of East Pakistan by the Pakistan Army, which since March has been seeking to crush the province's separatist movement.

"I have been very deeply hurt by what the Government of Pakistan has done," he said in an interview at the Indian Consulate here. "It is something like what Hitler did. I'm emotionally involved, I admit, but not as an Indian, as a democrat, as one who believes in peace."

The first stop of his unofficial mission was Cairo, where he failed in his attempt to meet any important figures in President Anwar el-Sadat's Government. He thinks that his failure was caused by the political crisis then taking place in Egypt but is not sure. Other Indians wondered whether it was because leaders in Cairo were reluctant to seem to be criticizing another Moslem government.

MET ARAFAT, TITO, POPE

But he did meet Yasir Arafat, the Palestinian commando leader who, he said, was "bubbling" with support for Bangla Desh, or Bengali nation, as the advocates of independence call it. Mr. Narayan said Mr. Arafat had told him that his forces had clashed with units of the Pakistan Army serving in Jordan. He quoted him as having said, "I can quite imagine what they must be doing to those Bengalis."

Later Mr. Narayan conferred with President Tito of Yugoslavia, Pope Paul VI and Chancellor Willy Brandt of West Germany. He also stopped in Moscow, Helsinki, Paris and London before arriving in Washington where he met Joseph J. Sisco, Assistant Secretary of State for Near Eastern and South Asian Affairs, and Henry A. Kissinger, President Nixon's adviser on national security.

Mr. Narayan has argued against the contention of Western officials that a total halt in aid to Pakistan would end any constructive influence they might have in the crisis.

On the contrary, he told them "putting the screws" on Pakistan would make it impossible for the military regime to continue its operations against the Bengalis. Giving aid, he contends, involves the donor nations in "the guilt of the Pakistan Army."

Mr. Narayan said he had been told in some capitals that aid must continue because of agreements made before the army moved against the Bangla Desh movement. He said he replied: "Those agreements were made by Pakistan. Where that Pakistan today when there is no administration in East Pakistan where 50 per cent of all Pakistanis live?"

For Mr. Narayan, the tour has been a necessary distraction from his main preoccupation-an effort to promote rural democracy in an obscure corner of the impoverished state of Bihar where the Maoist terrorists known as Naxalites have been active.