1984 ATC110 Sprocket Issue

[floydechoes2000]

Hey guys, I've owned my 110 just about forever and it's way overdue for some maintenance. I bought a chain and sprocket set about 15 years ago but priorities changed and the poor trike sat. Well I'm finally going to fix her up but upon reassembly I discovered I have the wrong countershaft sprocket. The splined portion where the first sub transmission gear goes is longer than the original. Not a big deal to get the correct parts but I'm curious as to just what I did buy all those years ago. Not many machines use a setup like this one, perhaps a 125M or a CT bike model? I'd like to try to sell what I have to recoup some of my loss.

In the pic the New sprocket is installed on the right, and I slid the old sprocket next to it for comparison... Any ideas?

[floydechoes2000]

Disassembled tonight, here's a better pic. I'm fairly certain it's for the ATC125M, the electric start case is wider and the taller one is a 14 tooth sprocket, where the 110 came with a 15 tooth stock. I'll never know if I ordered the wrong one or if they shipped the wrong one, I can't read the numbers on the box anymore.

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