Keihin FCR tuning manual.
Free tuning manual by Patrick Burns. It covers all the important topics in tuning your FCR racing carbs:
- synchronizing
- fuel screw
- slow fuel jet
- slow air jet
- slow air screw
- main fuel jet
- main air jet
- needle codes
- needle selection
- etc.
More tuning info can be found here: Marc Salvisberg's tuning manual