Defect
On certain motorcycles, the wrong bolts may have been used to attach the front brake calipers. As a result, the mounting hole threads could be damaged during servicing. If this happens, the brake caliper(s) could detach and cause a loss of braking.
Safety Risk
A loss of brakes can cause a loss of control and increase the risk of a crash.
Remedy
Yamaha will notify owners by mail and advise you to take your motorcycle to a dealership to inspect and, if necessary, replace the front brake caliper mounting bolt(s). If incorrect bolt(s) are found, the dealer will also inspect the front caliper mounting hole threads for damage, and replace the caliper(s) as necessary.