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

Keihin N427-OC jet needles meter fuel in large-body FCR carburetors. This family covers FCR35, FCR37, FCR39 and FCR41 carburetors, plus FCR-MX37, FCR-MX39 and FCR-MX41 applications, with each selectable profile defining a specific needle geometry for tuning.

Choose the exact three-letter Profile required by the carburetor and jetting setup. The profile is the variant identity: every option is an individual N427-OC needle with its own canonical MPN/SKU and matching Sudco order number, rather than a generic size-only replacement.

For FCR-MX carburetors, the exact verified diagram context is Ref 23, the jet-needle callout in the FCR-MX family exploded view. The FCR-MX37/39/41 fitment is distinct from the separate N427-90 FCR28–33 family, so N427-90 Ref 23 records are not included here.

• Keihin family: N427-OC; exact variant format: N427-OC-<PROFILE>
• Complete source denominator: 98 explicit profiles with exact 017-NNN Sudco orders
• Applications: FCR35/37/39/41 and FCR-MX37/39/41
• FCR-MX diagram context: Ref 23