CPSC campaign 05562
Hazard
Vibration from the engine and driveline during long periods of high rpm usage could cause the rear master cylinder reservoir to agitate, resulting in brake fluid aeration. A small amount of air bubbles could enter the master cylinder, adversely affecting rear brake performance.
Remedy
Free repair. Registered owners of the affected units were notified directly by mail sent on February 27, 2004. Consumers who have already responded to the recall and had their units repaired do not need to take any further action. Consumers who have not already responded to the recall should stop using their ATV immediately and contact an authorized Yamaha dealer to schedule an appointment for repair.
The text above is quoted verbatim from the CPSC record. Confirm the affected units and the remedy with the manufacturer or CPSC. Recall data may be incomplete, delayed, or superseded.