1983 BMW R80ST Disassemble, Rebuild, Assemble Transmission

The 1983 R80ST transmission is the same as the 1983 R100RS transmission that I rebuilt previously. So in this document, I provide links to the 1983 R100RS documents showing how I disassemble, rebuild and reassemble the transmission. I will provide pictures and details about what I find when I open up the R80ST transmission and will document any work I have to do on the R80ST that is different from the work I did on the R100RS.

I have the transmission cases vapor blasted by Colorado Vapor Blasting in Arvada, CO who is generously providing a discount to me in support of my goal of a charity auction of this R80ST to support the Motorcycle Relief Project.

Here is the link to the documentation for the transmission disassembly, rebuild and assembly including pictures of the 1983 R80ST transmission.

23 BMW 1983 R80ST Disassemble, Rebuild, Assemble Transmission

Here are pictures of the rebuilt transmission.

Transmission Serial Number-Z078854

Transmission Assembled-Red Tape On Fill Plug Means I Haven’t Put Gear Lube In The Transmission Yet

Transmission Assembled-Rear

Transmission Assembled-Bottom

Transmission Assembled-Front

6 thoughts on “1983 BMW R80ST Disassemble, Rebuild, Assemble Transmission”

Manuel Leal Muñoz on January 21, 2023 at 1:10 pm said:

Congratulations for your publications.
I have been following you faithfully for a long time.
I happen to own an R80ST and this tutorial makes me very happy.
Would you be so kind as to tell me the torque you apply to the shifter?

Thanks and best regards from my admirer Manué.

Reply ↓
- breams on January 21, 2023 at 6:18 pm said:
  
  Manuel,
  
  I’m glad this project is helpful to you. I just tightened the bolt on the foot shift lever “tight”, but I don’t lean into it as it’s only an M6 bolt, so the torque is pretty low.. I didn’t use a torque wrench.
  
  Best.
  Brook.
  
  Reply ↓
Mike McAllister on January 22, 2023 at 9:18 am said:

Thanks again for taking the time to show us the process of completely rebuilding this wonderful motorcycle. Sure takes a lot of work for this worthy project, plus the time to let us follow along! Thank you!

Reply ↓
- breams on January 22, 2023 at 9:37 am said:
  
  Mike,
  
  You’re welcome. I hope this information helps folks work on their airheads and keep them flying for many years to come. 🙂
  
  Best.
  Brook.
  
  Reply ↓
Fabio Ranieri on January 23, 2023 at 6:40 am said:

Sei il numero uno,con i tuoi tutorial, mi si aperto un mondo.
Complimenti!!!.

Reply ↓
- breams on January 23, 2023 at 2:11 pm said:
  
  Fabio,
  
  Grazie per le gentili parole 🙂
  
  Best.
  Brook.
  
  Reply ↓