19-03-12, 10:13 PM
(This post was last modified: 19-03-12, 10:14 PM by Falcon 269.)
Broken gear selector return spring is my first thought. Can be easily fixed without having to go into the gearbox, so your dealer should sort it in a couple of hours. Another even simpler cause could be maladjustment of the gear lever mechanism itself. The Rose joints need to be clean, greased, free-moving and correctly aligned to give the best shift. However, the way this problem suddenly came about suggests something has broken, hence my first idea.
Like the original R1s on which this motor is based, early Gen 1s sometimes suffered gear dog wear on the 2/6 pairing which could cause it to jump out of second when accelerating hard. Not your symptom, though. I believe Yamaha quietly upgraded some of the gearbox components to rectify this issue fairly soon after the Gen 1 came on the market.
Like the original R1s on which this motor is based, early Gen 1s sometimes suffered gear dog wear on the 2/6 pairing which could cause it to jump out of second when accelerating hard. Not your symptom, though. I believe Yamaha quietly upgraded some of the gearbox components to rectify this issue fairly soon after the Gen 1 came on the market.