You need two things to synchronize your BMW 2002 carburetors. A Uni-Syn and a can of Excalibur car wax.
The plastic top of the Excalibur wax fits over the carbs perfectly after removal of the air cleaner hold-down studs. Cut a hole in the center of the plastic top and you have an adapter so you can use the Uni-Syn.
Author: Philip Marvin