Received my JT sprockets and DID 520VM chain today, and had two "false alarm" surprises. I unwrapped the 15T front sprocket and noticed that it has the two holes for the early models that had the keeper instead of the large nut and lockwasher. I figured I had screwed up and ordered the wrong sprocket.
When I got home I checked on the JT site though, and it is the correct sprocket... they just make it so it will work on either the later model or earlier model KLR.
Second, I took the rear sprocket out of the envelope and saw a large "C45" mark on it. Damn, thought I, they sent me a 45 tooth when I thought I ordered a 44. Looking more closely though, it is also stamped with the part number ending in -44, and just to be safe I counted the teeth... 44 of them.
I remember once before being confused about this on a JT sprocket... all the steel ones have that C45 designation, and it has nothing to do with how many teeth it has.
Whew. Both were false alarms. The chain and sprockets go on Saturday morning.