When I did the inspection of the bike, the throttle and choke cables looked pretty worn with kinks showing in the outer armor. The Bowden connector rubber boots are disintegrating. I’m replacing the cables before riding the bike as I don’t want a stuck throttle or broken cable to happen. I found removing the cables from the Bowden connector required a little technique, but once I figured this out for the choke, the throttle was done pretty quickly.
Choke Lever Removed from Housing (Note Broken Strand in Choke Cable)
Choke Bowden Connector on Left Side With Disintegrating Rubber Boot
Choke Cable Part Numbers
Assembled Choke Bowden Cable
I’m completing a front fork rubber cup replacement and check of the fork alignment. I hope to post that soon. After that, I think the bike is ready for my first ride.
You know, being retired just seems to leave no time to work in the shop. I end up doing all sorts of things and the next thing you know, time for bed. Anyway, I finally wrote up the Bing carburetor rebuild/refinish work I did on the 1983 R100RS project.
When I rebuilt a 1973 BMW R75/5, I covered the procedure I used to rebuild the Bing type 64 carburetors, which are 32 mm, and the Karcoma petcocks. The R100RS has type 94 carburetors that are 40 mm and the Karcoma petcock outlet is 90 degrees from the inlet instead of directly underneath the inlet as for the R75/5. After 10 years, the designs are essentially the same, but there are some differences which I cover in the procedure write-up.
Here is the link to the R100RS Bing type 94 rebuild/refinish procedures.
The R100RS write-up contains links to the R75/5 procedures for the Bing type 64 carburetor and notes any differences or changes in how I did the work on the R100RS carburetors. Here is the link to the R75/5 type 64 carburetor rebuild/refinish procedures.
The combination of these two write-ups covers the type 64, 32 mm (64/32/10, right side and 64/32/9, left side) and the R100RS type 94, 40 mm (94/40/114, right and 94/40/113, left) carburetors.
I hope this material makes it straight forward for folks to rebuild these carburetors who may have been afraid to tackle a carburetor rebuild. Here are some before and after pictures of the carburetors.
Before Rebuild/Refinish
Before-R100RS Type 94 Left Carburetor
Rusty Screws and Cap on Dome
Grunge and Fuel Stains
Float Bowl Removed, Missing Paint on Emblem
After Rebuild/Refinish
Engine Side of Restored / Rebuilt Carburetor
Top Side of Restored / Rebuilt Carburetor
Outlet Side of of Restored / Rebuilt Carburetor
After-R100RS Type 94 Rebuilt and Refinished Carburetor
In January, I found my next project bike, a 1983 R100RS with 83,382 miles on the odometer. The bike was build on February 9, 1983 and delivered to RPM Motorcycles in Ventura, CA on March 1, 1983.
1983 R100RS Project Bike
Original Dealer Prep Date, March 1, 1983 (European Date Form)
I created a project index page where I’ll post links to the procedure write-ups as I work on the project. I’ll also post short introductory blogs for each phase of the work as I did for the 1973 R75/5 restoration project I completed on July 4, 2014.
This is the link to my initial inspection and extensive “before” photos I took.
Based on the inspection, I plan to do a major service, carburetor and petcock rebuild, and any other essential maintenance. Then I will ride the bike for a couple hundred miles so I have a baseline for how the bike runs and handles before I dive into the rebuild.
