This may be helpful
PD: Primary Drive - Alton sprocket
Has anyone used a standard metal sprocket long term on a twin Alton? I just returned from a nice end of season ride with my ammeter showing -2, so checked the Alton drive sprocket and found this: I have heard that the standard PD15 can damage the middle row of the primary chain, which would...
www.vincentownersclub.co.uk
ET164 with Alton - V3 Clutch Drag.
Well, I answered my question about putting the ET164 in with an Alton. I pulled the ring out today and it had a burned/blue spot where the Alton adapter had rubbed on it. There is very little room for adjustment of the Alton around its adapter for Vincents and with all the drive bits installed...
www.vincentownersclub.co.uk