Yamaha has issued a worldwide recall for the 2015 YZF-R1 and R1M. According to a letter from Yamaha Motor Corporation, USA, the issue affects the gearbox of its top-of-the-line superbike.

The letter states that “both second gear wheel and pinion gears in the transmission may break as a result of extremely high stress and/or improper shifting”. Yamaha is saying the problem is caused by inadequate component strength and stress concentration.

The statement also says that third and fourth gear may fail “as a result of excessive stress caused by hard usage”. Yamaha estimates it will take 16 hours of workshop time to replace the gears with upgraded components.