Motorcycle engine ignition system Honda CB400SF/1 (1992-1999)

Precautions for the repair and maintenance of electrical equipment
The electrical circuit of Honda CB400SF motorcycles is single-wire, the second conductor is «weight» - the engine and frame of the motorcycle. WITH «weight» the negative terminals of the battery and consumers of electrical energy of the motorcycle...

Scheme of the ignition system
The layout of the elements of the ignition system: 1 - control lamp of the side stand; 2 - switch (lock) ignition; 3 - emergency engine switch; 4 - ignition coils; 5 - electronic engine control unit; 6 - battery; 7 - side stop sensor; 8 - start...

Spark plugs — replacement
Fuel tank removed (see « Fuel tank - removal and installation »). Spark plugs should be replaced every 10,000 km. Attention! Candles are replaced only as a set. Attention! If the motorcycle engine was running just before changing the spark plugs, be...

High voltage wires and caps — replacement
Due to the fact that spark plug caps and high-voltage wires are exposed to direct moisture and road dirt, they can fail. This is accompanied by a deterioration in spark formation or the complete disappearance of the spark discharge on the spark...

Ignition coils — removal and installation
To remove the ignition coils you must first remove the seat (see « Seat - removal and installation ») and fuel tank (see « Fuel tank - removal and installation »). Removing 1. We remove the terminals of the low-voltage wires from the coil, after...

Breaker — removal and installation
Removing 1. Disconnect the breaker wire connector located under the left plastic lining. 2. Using an 8 mm wrench, unscrew the seven bolts securing the left engine cover. 3. Remove the cover, clean the surface of the cover and crankcase from the...

Engine control unit — removal and installation
To remove the engine control unit, you must first remove the seat (see « Seat - removal and installation ») and disconnect the cable from the negative battery terminal. Removing 1. Using a 10 mm wrench, unscrew the bolt securing the control unit...

Diagnostics of the ignition system
Before proceeding with the diagnosis of individual components of the ignition system, make sure that: I. The battery is fully charged. 2. The start lock switch is in the Run position. 3. Side stop is complicated. 4. Neutral gear engaged. 5. The...

Checking the side stop sensor
Using an ohmmeter, we measure the conductivity between the contacts of the side stop sensor connector (green connector, green-white and yellow-black wires). When the stop is set, the ohmmeter should show the presence of conductivity and the absence...

Checking the neutral sensor
The engine control unit has been removed. Using an ohmmeter, we measure the conductivity between the contacts of the connector of the engine control unit (blue-green wire) and motorcycle frame («weight»). When the neutral gear is on, the instrument...

Clutch Lever Sensor Check
The engine control unit has been removed. Using an ohmmeter, we measure the conductivity between the contacts of the connector of the engine control unit (green-white wire) and motorcycle frame («weight»). When the clutch lever is pressed, the meter...

Checking ignition coils and high voltage wires
Attention! The high-voltage part of the ignition system operates at a voltage of more than 1 kV, therefore, in order to avoid injury from an electric discharge, it is forbidden to remove the high-voltage wires from the spark plugs while the engine...

Breaker test
1. Using an ohmmeter, check the resistance between the breaker terminals (blue connector). The nominal resistance should be in the range of 340-550 ohms. 2. Turn on the ignition and, turning the crankshaft with a starter, measure the voltage between...