Yamaha has mailed letters to owners of record in regards to the importance of properly reinstalling the crankcase breather hoses onto the airbox, should it be removed for servicing or adjustment. If the two hoses are not reinstalled properly, an oil leak can occur which may lead to engine damage.
The key is to verify both crankcase breather hoses are reinstalled after removing the airbox on RS three-cylinder models. Yamaha has added new warning labels to new RS models, and has sent a label to owners of record to be placed on the side of the airbox along with a letter explaining this. Often, the airbox is removed to service the battery, and you can find the proper procedure to making sure your hoses are connected properly in your ownerâ€™s manual.