Harley-Davidson is recalling approximately 4,500 FXDL Dyna Low Rider bikes worldwide because excessive engine vibration can turn the ignition switches from "on" to "accessory."
The recall covers motorcycles from the 2014 ½ model year, at least 3,300 of which were sold in the United States.
Harley says the issue occurs in motorcycles that have been modified to rev higher than 5,600 rpm, which causes an engine bracket to vibrate excessively. If the switch goes to "accessory" the ignition is cut.
Harley says there have been no crashes or injuries reported from the problem.
Dealers will replace the bracket assembly and ignition switch knob for free.
The company said the engines powering the FXDL Dyna Low Rider are limited to 5,600 rpm from the factory, but it does offer performance mods that let the engine rev higher.
Harley says it was made aware of the problem after its service department found that an ignition switch slipped out of the "on" position in testing. It says there have been four warranty claims dealing with the problem, all of them on bikes with aftermarket exhaust systems.