The efco brand weed trimmers are red and gray with either a bike or a loop handle configuration, the Consumer Product Safety Commission said Tuesday.
The recalled trimmers are 36cc models 8371 S and 8371 T, and a 40.2cc model 8421 T engine displacement.
The brand name "efco" and model number are printed on the front of the engine and the brand name also appears on the wand, the commission said.
Mufflers on the trimmers can break during use, increasing the risk of fire.
The trimmers were made in China for Emak USA of Wooster, Ohio. They were sold at efco dealers and online, and at Menards stores from June 2008 through July 2013 for about $400.
Consumers were advised to stop using the trimmers and bring them in to an authorized efco dealer for a free muffler replacement kit.
Consumers can call 800-800-4420 for information.