Yaşar Topçu entered politics joining the True Path Party led by Süleyman Demirel. He was elected deputy of Sinop Province in the 1987 general election held on October 29. Following the 1991 general election held on October 20, he was appointed Minister of Transport in the coalition cabinet of Demirel. He served at this position between November 20, 1991 and June 25, 1993. Topçu then joined the Motherland Party led by Mesut Yılmaz. He was re-elected in the 1995 general election on December 24. Topçu was appointed once again government minister in the coalition cabinet of Yılmaz. As Minister of Public Works and Urban Planning, he served from June 30, 1997 until January 11, 1999. During his term of office, the main project he had dealt with was the construction of the Black Sea Coastal Road stretching all the way from west to Sarpi at the Turkish-Georgian border. Planned in the 1960s, the project was started only in 1987 by Prime minister Turgut Özal. However, its begin was dated 1988 with the opening of the border to Georgia. The project became soon suspended due to financial problems. It revived after the establishment of the Organization of the Black Sea Economic Cooperation in 1992. Prime minister Yılmaz, a native of Black Sea Region, tasked Topçu, also a Black Sea Region native, with the restage of the construction works, which were backed by foreign credits. In the 1999 general election on April 18, he could secure his seat in the parliament for the fourth time. As it became apparent that the tendering was not lawful, a parliamentary committee investigated the case. It concluded that Yaşar Topçu was involved in bid rigging on tender and abuse of office. The motion to send him before the Constitutional Court for trial was, however, was rejected in the parliament on June 29, 2000. On January 6, 2004, a new parliamentary investigation committee was formed to reopen the case on allegations against Topçu. Worked between April 13 and October 27, 2004, it confirmed the findings of the former committee, and proposed to send Topçu before the Constitutional Court on charges of bid rigging. After the acceptance of the related motion in the parliament, the Constitutional Court tried Yaşar Topçu in time between November 11, 2004 and May 26, 2006. The supreme court found Topçu guilty of malpractice, not of bid rigging, for his conduct in the time from August 25 to September 19, 1997 in seven points related to the public tender for the construction of the Black Sea Coastal Road. However, he was freed of imprisonment in accordance with the applicable law, which allows the postponing of the court's final judgement. Yaşar Topçu joined later the Democratic Party, and temporarily served as the provincial leader of the party in his hometown.
