1983 BMW R100RS Install Carburetors, Cables And Air Box

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.

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.

Air Box Top, Air Filter And Air Box

Air Box Top, Air Filter And Air Box

Air Box Internal Parts And Fittings

Air Box Internal Parts And Fittings

Air Box Fittings

Air Box Fittings

Air Horn Plastic Pipes Attach To Tee With Wire Spring Clamps

Air Horn Plastic Pipes Attach To Tee With Wire Spring Clamps

Snap Clips Into Air Box Cover Slots

Snap Clips Into Air Box Cover Slots

Choke Cable Bowden Connector Housing Routing Under Starter Relay (Left Side)

Choke Cable Bowden Connector Housing Routing Under Starter Relay (Left Side)

Throttle Cable Bowden Connector Routing Next To Frame On Top Of Voltage Regulator (Right Side)

Throttle Cable Bowden Connector Routing Next To Frame On Top Of Voltage Regulator (Right Side)

Richer 170 Main Jet Installed In Jet Carrier

Richer 170 Main Jet Installed In Jet Carrier

Adjust Throttle Stop Screw So It Just Contacts Throttle Arm Using A Piece Of Paper

Adjust Throttle Stop Screw So It Just Contacts Throttle Arm Using A Piece Of Paper

All Done-Left Side

All Done-Left Side

All Done-Right Side

All Done-Right Side

All Done-Top

All Done-Top

 

2 thoughts on “1983 BMW R100RS Install Carburetors, Cables And Air Box

  1. Your comments and info on the carburetor slide needles helped me immensely. Thank you.
    I actually have the same electrosport plastic slide caliper. Made me smile to see that is what you used.
    After setting the idle Jets and then power balancing between the cylinders my r100 1977 is working wonderfully
    Thanks from Rodney

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