Completed the swap over on the ER5 today, took a bit longer than it should have as I was sent the wrong front sprocket...but at least I got a chain breaker as compensation.
Well, it wasn't too bad today, everything kind of just went together like it is supposed to, nice when that happens
Took it for a test ride and I couldn't believe the difference the new chain and sprockets made

Smoother, and it feels like a little more power is making its way to actually spinning the rear wheel. That is likely, as there were a couple of tight spots in the last chain (front sprocket was VERY badly worn).
Well, I can mark that off the list of things I've done...