I also believe that the U joint was designed for a Goldwing and not the Valk. Since the Valk has more torque it puts more strain on the u joint. I've talked to a goldwing mechanic and he said that he has replace maybe 3 u joints in all the years he's worked on 1500 goldwings. Also I think Valk riders are a little more aggressive with burn outs and wheelies than goldwing riders.
Dave
Some of the other posts on this subject say otherwise: That the Goldwing u-joint was beefed up after the introduction of the Valk so they could use the same part.
Maybe someone who knows for sure will chime in.