2023 Yamaha Tracer 9GT / 9GT+

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I thought it was the oilheads that had the problems?  Or was it the Hex/Cam heads?

Seriously, the paralever design creates some challenges for the intended benefit of minimizing shaft jacking.

The problem I was referring to is the occasional failure of the yoke of the universal joint in the shaft itself. There have been several instances of this occurring - usually at inappropriate times - causing immediate stoppage of the motorcycle and potential large damage to other nearby parts of the bike. Compared to the large numbers of these bikes I don't think that it is a widespread problem, but it is wide enough to have happened to at least one member of this Forum. That is close enough to home for me to feel it to be significant.

The final bevel gear/ring bearing assembly had problems in prior generations.  The 90-degree rotation and shake test was done by many of us.