Description of the frame structure Honda CB400SF motorcycles use frames of two modifications - NC31 and NC39. The frame is welded from thick-walled steel pipes, reinforced with gussets, and is a carrier for all components and assemblies of the motorcycle. The frame consists of a...
Verification of geometry and main welds The frame geometry should be checked if the motorcycle has been dropped at high speed or after an accident with a severe side or frontal impact. It should be noted that it is impossible to fully check the frame geometry and the quality of welded...
Seat — removal and installation The seat of the motorcycle is made easily removable for quick access to the saddle luggage capacity and the battery. No tools are required for removal and installation, only the ignition key is needed. Removing 1. The lock cylinder is located on the...
Rear trim — removal and installation Removing To remove the rear trim the seat must be removed (see « Seat - removal and installation ») and tail light (see « Rear position lamp and brake signal - removal and installation »). 1. Using a Phillips screwdriver, unscrew the four screws 1...
Side trim — removal and installation Removing The seat must be removed to remove the side panels (see « Seat - removal and installation »). 1. With a 5 mm hex wrench, unscrew the two screws securing the lining. 2. Remove the lining, pulling its lower part towards you and down....
Fuel tank — removal and installation Removing 1. Disconnect the negative wire from the battery terminal (see « Rechargeable battery - removal and installation, maintenance »). Attention! Be careful when working with fuel system parts. Gasoline vapors are explosive. 2. Move the flag of...
Front wheel guard — removal and installation To remove the front wheel guard, you must first remove the brake calipers (see « Front brake caliper - removal, cleaning, installation ») and the front wheel of the motorcycle (see « Front wheel - removal and installation »). Removing 1. With an 8...
Rear wheel guard — removal and installation Removing Seat removed (see p. 31, «Seat. Removal and installation»). Tail light removed (see « Rear position lamp and brake signal - removal and installation »). Rear trim removed (see « Back facing - removal and installation »). 1. Using a 10 mm...
Driver footrests — removal and installation Removing 1. Using pliers, remove the cotter pin of the footboard axis. 2. Remove the axis of the footrest. 3. Remove the footrest with a spring. 4. Removing the right footrest is done in the same way. Installation Installation is carried out in the...
Passenger footrests — removal and installation Removing 1. With pliers we unbend and remove the cotter pin from the axis of the footrest and remove the washer from the axis. 2. Extract axis. 3. Remove the footrest from the bracket while holding the lock plate against the footrest. Attention!...
Footrest brackets — removal and installation Removing To remove the left footpeg bracket, you must first remove the shift pedal assembly (see « Gear shift pedal - removal, installation and adjustment »). Removing the left bracket 1. With an 8 mm hex wrench, unscrew the two bolts securing the...
Seat box — removal and installation To remove the seat pan, you must remove the seat (see « Seat - removal and installation »), battery (see « Rechargeable battery - removal and installation, maintenance »), side panels (see « Side trims - removal and installation »), tail light (see...
Air filter housing — removal and installation To remove the air filter housing, first remove the seat (see « Seat - removal and installation »), fuel tank (see « Fuel tank - removal and installation »), side panels (see « Side trims - removal and installation ») and carburetor bar (see « Plank...
Side stop, side stop sensor — removal and installation Removing The motorcycle must be placed on the center stand before removal. 1. Fold the side stop and remove the return spring with pliers (Engine removed for illustration). 2. Using an 8 mm wrench, unscrew the bolt securing the side stop sensor. We...
Center stand — removal and installation Attention! Before removing the center stand, the motorcycle must be securely secured against a possible fall. Removing The left footrest bracket, swingarm and muffler have been removed for clarity. 1. Using a 10 mm wrench, unscrew the axle mounting...
Seat box lock — removal and installation The seat must be removed to remove the seat lock (see « Seat - removal and installation »). Removing 1. Using pliers, remove the seat clamp return spring. 2. We remove the latch cable boss from the groove. 3. Using a 10 mm wrench, unscrew the two...
Fuel filler cap — maintenance Trouble-free operation of your motorcycle requires that the fuel filler cap be serviced regularly as part of the annual service. First of all, the fuel tank cap lock requires maintenance. It must be regularly lubricated by dropping a few drops of...
Rear-view mirrors — removal and installation Removing 1. To remove the rear-view mirror, loosen the fastening nut with a 17 mm wrench and then unscrew the mirror with your hands. Installation We install the mirror in the reverse order, setting the mirror bracket to ensure normal visibility....