Greetings,
Gilera RC600, RC600R and Nordwest are using Teikei twin choke carb which is similar to Yamaha XT600.
I prepared web pages based on XT carb manual that can be viewed at http://ebatur.fateback.com/fb/xt600/xt6001.htm . Construction is the same but calibration data may differ because they are copied from XT600 repair/maintenance manual.
Enjoy,
Carburetor manual for you
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