Shares of the transport company tumbled following the announcement, which affects factories in Wisconsin and Pennsylvania.

The move does not affect operations of Harley’s LiveWire electric motorcycle business, the company said.

“This decision, taken out of an abundance of caution, is based on information provided by a third-party supplier to Harley-Davidson late on Tuesday concerning a regulatory compliance matter relating to the supplier’s component part,” Harley-Davidson said.

A Harley spokesman declined further comment.

The motorcycle maker has previously been among the many companies in transport to cite the shortage of semiconductors as a drag on operations, leading to leaner profit margins in the most recent quarter.

Shares fell about 10% to US$32.22 in early afternoon trading.