Bajaj Auto today reported a 39.31% increase in net profit at Rs 263.13 crore for the second quarter ended September 30, 2005 as against Rs 188.87 crore in the quarter ended September 30, 2004.According to a release issued by Bajaj Auto to the BSE today, income increased 27.39% to Rs 1,969.57 crore in Q2FY06 as against Rs 1,546.08 crore in Q2FY05.