YAMAHA issued a recall on the YZF-R1 model

On certain motorcycles, the second gear wheel and the pinion gears in the transmission may be of inadequate strength. In high stress cases, this could cause internal components in the transmission to deform or break. If gears were to fail, the transmission could lock up, which would also cause the rear wheel to lock up. This could result in loss of control and/or a crash, increasing the risk of injury and/or damage to property. Correction: Dealers will replace the transmission assembly with one that includes gears of a different design.