Originally Posted by thirstybuck
Scrambler - thanks for the reply and the pictures; that answered a lot of questions. I put the NX back together and rode it to work and back, about 6 miles. The new chain is great and the countershaft didn't
The countershaft is in good shape. I still think that that is a hell of a lot of lateral play, but I haven't had to deal with countershaft sprocket before. The back and forth play, chain directions, is much better than side to side. Tell me what you think.
I failed at getting the video to embed so you'll have to settle for the link.
The sprocket needs changing because it is hooked and worn. The play is fine side to side so long as the splines on the lock plate are not worn. Perfectly normal. Those bumps are "ramps " to help guide the chain on the origin al sprocket.