Budoka,
I've read that the CSC conversions have had a number of failures that you describe. Your friend may want to check with others to see if they have had the same problem. It could be a big problem for CSC.. This comment was posted elsewhere:
Sneaky Snake, we're talking about two differently designed driveline systems here. I'm only pointing out that the CSC failures are occurring in the same area of the driveline, the HONDA designed and engineered driveshaft. Remember, we're talking about two different systems: the 1st Gen. which used the GL1500/Valkyrie yoke (which dries up for lack of lubrication) and the 2nd Gen. system which fails due to the HONDA designed and engineered front shafts female splined gears shearing. Two different systems, two distinct failures. But, the common denominator is that it's a HONDA drive shaft that's failing. However, you can't fault HONDA. They didn't intend for those shafts to be used on a trike.
It was explained to me the other day that every mechanical design has a weakness, be it intentional or inherent. If this is true, then the drive systems, in these two instances, are the weak links.