Tachometer repair on '77 R100/7

I am working on a repair to the tachometer on my '77 R100/7 and I would appreciate your help. I heard a rubbing sound the other day when the bike started cold, but the sound went away after warming up. I probably should have disconnected the tach cable, but I didn't. Today the sound occurred again, and eventually the needle stopped moving and the rubbing sound got louder and began to make a rattling sound. I took apart the tach/speedo unit and I noticed that a white plastic gear on a metal rod seems to be damaged on the tachometer. I haven't been able to find this replacement part, and I was wondering if anyone here has experience replacing this. I would rather replace the plastic gear than the whole speedo/tach unit! Thanks in advance for your help.

Welcome! Check the link in my signature line. Terry Vrla might be a good contact to see what he can do for you.

Overseas Speedometer in Austin Tx does good work.

I highly recommend Terry’s work.

Best in the West! Terry repairs our airhead instruments for reasonable rates and does great work.

Terry Vrla
776 se 3rd ave
Hillsboro, Oregon 97123
USA

Home: (503) 421-5782
Email: terryvrla@hotmail.com

Terry does excellent work and is reasonable in price!