Keihin Jet Needle — N427-0C Series (FCR 35–41mm / FCR-MX)

New Keihin N427-0C jet needles for FCR35, FCR37, FCR39 and FCR41 carburetors, plus FCR-MX37, FCR-MX39 and FCR-MX41. Each three-letter profile has a different needle geometry for fuel metering and tuning.

Choose the profile required by your carburetor and jetting setup. The N427-90 needles for FCR28 to FCR33 are a different series.

• For FCR-MX carburetors, the exact verified diagram context is Ref 23, the jet-needle callout in the FCR-MX family exploded view.
• FCR-MX diagram context: Ref 23