Installed the solas concord and wear ring this weekend, also changed the jet pump oil since you lose some anyway. the job was much easier than expected, took about 2 hours total.
On a side note, I noticed the original ring had spun in the housing because grooves were cut into the outside of the ring. I don't know how much it spun, but Ben's suggestions of putting screws into the housing are good ones. I put 2 short self-tappers into each side, making sure they didn't penetrate the walls and covered them in silicone. There's no telling how much top end could be lost if the ring is spinning, let alone the damage to the pump housing.
First impression: the acceleration is much improved. It pulls way harder and is actually hard to hold on when in smooth water. In chop, when you hook up, you better be holding on because it will absolutely take off
low end is better, pump loads faster, and top end gained 4 mph according to digital speedo. RPMs were steady at 7060-7070, which is ideal for this motor, seeing as rev limit is 7250. I also can hit the limiter much faster and easier now combined with the 50cc head. Might have to look into a programmer.
Hopefully next weekend I'll get some time to install the white pipe, jet kit, and power plenum filter.