Honda Motor Co (7267.TYO, HMC.NYSE) was forced to halt production at four auto plants after workers at a parts factory took strike action during wage negotiations, Bloomberg reported. Honda this week closed three plants in Guangzhou, Guangdong province on May 24; one in Wuhan, Hubei province on May 26; and the Honda Auto Parts Manufacturing Company in Foshan, Guangdong, on May 17 as workers making transmissions and engine parts went on strike. The car factories affected have a combined annual production capacity of 650,000 units a year. Honda said it does not know when production can resume or how much output will suffer because of the strike. Honda earlier announced plans to boost China production to 830,000 by the second half of 2012 to meet rising demand.