I can't find it anywhere else on the internet...... but the JT rear sprocket is "dished" - and it will throw the chain alignment off if it is mounted the wrong way. Can somebody get a couple straight edges and measure the depth of the dished section? It should only be a millimeter or two, but I would like to find out for certain.
Or better yet, if you have taken a JT rear sprocket off because it has served its use and want to send it to me, that would work out as well. Thanks folks.