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

Precautions for repair and maintenance of electrical equipment
The electric circuit of the Honda CB400SF motorcycle is single-wire, the second conductor is the "ground" - the engine and frame of the motorcycle. The negative terminals of the battery and consumers of electrical energy of the motorcycle are...

Ignition system diagram
Ignition system elements layout diagram: 1 - side stand indicator lamp; 2 - ignition switch (lock); 3 - engine emergency switch; 4 - ignition coils; 5 - electronic engine control unit; 6 - battery; 7 - side stop sensor; 8 - start inhibit switch; 9 -...

Spark plugs — replacement
The fuel tank has been removed (see "Fuel tank - removal and installation"). Spark plugs should be replaced every 10,000 km. Attention! Spark plugs are replaced only as a set. Warning! If the motorcycle engine was running immediately before...

High Voltage Wires and Caps — Replacement
Due to the fact that spark plug caps and high-voltage wires are directly exposed to 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"). Removal 1. Remove the low-voltage wire terminals from the coil, having previously...

Breaker — removal and installation
Removal 1. Disconnect the breaker wire connector located under the left plastic cover. 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 wire from the negative terminal of the battery. Removal 1. Using a 10 mm wrench, unscrew the control unit bracket mounting...

Ignition system diagnostics
Before you begin diagnosing individual components of the ignition system, make sure that: I. The battery is fully charged. 2. The starter lock switch is in the Run position. 3. The side support is folded. 4. Neutral gear is engaged. 5. The...

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

Checking the neutral sensor
The engine control unit has been removed. Using an ohmmeter, we measure the conductivity between the contacts of the engine control unit connector (blue-green wire) and the motorcycle frame ("mass"). With the transmission in neutral, the instrument...

Checking the clutch lever sensor
The engine control unit has been removed. Using an ohmmeter, we measure the conductivity between the contacts of the engine control unit connector (green and white wire) and the motorcycle frame ("mass"). When the clutch lever is pressed, the device...

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

Checking the breaker
1. Using an ohmmeter, check the resistance between the breaker terminals (blue connector). The nominal resistance should be within 340-550 Ohm. 2. Turn on the ignition and, turning the crankshaft with the starter, measure the voltage between the...