I show how I remove the carburetors and airbox in this write-up.
Since I am converting this RS model to an RT, the handlebar throttle and choke cables have to be longer and I show how to change the handlebar cables in the Bowden assembly. I installed them when I installed the handlebar perches as shown here.
I had the air box powder coated. Although the carburetor rebuild was a couple years ago, I rode the bike less than 1,500 miles after the rebuild and they have been off the bike for about two years. I inspected the o-rings and found they are in good condition so no need to do another carburetor rebuild.
Since I modified the engine to boost compression from 8.2:1 to 9.5:1 and had the heads bored for dual spark plugs, I have to change the carburetor jetting. This engine has the same configuration as the engine in my 1977 R100RS that has the CFO (California, Florida, Oregon) configuration, so I use the same carburetor jetting.
When I first got the bike, I rebuilt the carburetors and “updated” the pulse-air system that fed air to the exhaust ports as shown here.
- 13 BMW 1983 R100RS Rebuild Bing 94/40 Carburetors & Karcoma Petcocks
- 13 BMW 1983 R100RS Update Pulse Air System
Here is how I did the work.
And this is a video summary of the procedure.
VIDEO: 1983 R100RS Install Carburetors, Cables And Air Box
Here are a few pictures from the write-up.