The company had sold 3,01,361 bikes in January 2013, Bajaj Auto Limited said in a release here.
The overall domestic sales including commercial vehicles also fell by 8% during January 2014, it said.
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Bajaj Auto sold 3,18,177 vehicles in the reporting month as against 3,47,624 units sold a year ago, the company said.
Exports, however, surged by 7% to 1,37,644 units as against 1,28,482 vehicles in the corresponding period of 2013, it said.