About the Honda CB400F
Carburetor, engine and chassis parts for Honda’s original small Four.
Introduced in December 1974, the CB400 Four developed the CB350 Four into a sportier motorcycle with a six-speed gearbox and distinctive four-into-one exhaust. The original export engine displaced 408 cc; a 398 cc version followed for Japan in 1976. That market difference matters when identifying an imported restoration project.
Plan the carburetor and engine work together
Before ordering for the Four, record the carburetor body markings and list the engine joints you expect to open. That gives you a practical way to compare a rebuild kit and gasket set with the job. A replacement carburetor bank, engine or front end needs its own component match.
Know your motorcycle before choosing partsOriginal Honda CB400 Four and later CB400F models
The CB400F name alone does not identify the engine generation.
Original CB400 Four
408 cc export and 398 cc Japanese versions
Honda’s original Four had different displacement versions by market. Check the frame and engine identity when buying parts for an import.
Parts checkpoint: Confirm the product application for the motorcycle and engine you have.
1975–1977 repair examples
Early-Four carburetor and gasket sets
The rebuild kit and overhaul gasket set below both list the early Four. Review kit contents and ordering quantities as part of your repair plan.
Parts checkpoint: One kit should not be assumed to service the full carburetor bank.
Twin-cylinder alternatives
CB400T Hawk and CB400A Hondamatic
The Hawk and Hondamatic belong to a separate twin-engine family. Their engine and fuel-system applications differ from the original Four.
Parts checkpoint: Start in the twin’s collection if your bike is a T or A model.
Honda CB400T Hawk partsLater CB400F generations
Check the year before choosing Four parts
Later uses of CB400F include a different liquid-cooled twin. A matching tank badge does not make a 1975–1977 kit suitable.
Parts checkpoint: Use the selector for your later model and year.
Honda CB400 parts
Frame, engine & fitted componentsHonda CB400F identification checklist
Use these details to match your motorcycle and any replacement assemblies before ordering.
- Record the frame and engine numbers, retaining both prefixes.
- Establish whether your bike is the original Four and whether it is an export or Japanese-market version.
- Copy the carburetor body identification; include photographs if the bank has been replaced.
- Inspect the fitted fork and rear hub before choosing seals or brake shoes.
Contact PartsNMore with clear photos of the frame/VIN, engine number and the part’s markings, plus any known component changes.