Koso BB642W20 Instructions Manual Download Page 2

NOTE

Wiring instructions

Installation 

Follow those steps when installing

Green

Yellow / White
Yellow / White

Black / L Green

Yellow / White

Yellow / White

Gray

NOTE

NOTE

NOTE

2-2

wh642bb03b-P4-1

Brown & Red / RPM wire

RPM wire set (Type B) 

(Accessory 5)

Ignition coil positive

Flywheel

Tachometer

pick up

Coil

Spark plug wire

Spark plug cap

Spark

RPM wire set (Type A) 

(Accessory 4)

RPM wire set (Type A) 

(Accessory 4)

Magnet (Accessory 3)

Red (+12V) (Connect to the battery DC 12V ) 

Orange / L turn signal (+12V)

Purple / EOBD light (-)

Passive speed sensor (Accessory 2)

The color listed above may differ depending on the model.

The fuel sensor is electronic type, don’t parallel 

connect it with the original- otherwise the fuel 

gauge won’t work. The wrong installation of the 

fuel wiring may cause the meter to break.

Blue / R turn signal (+12V)

Yellow / High beam light (+12V)

Gray / Oil light (-)

Speed sensor wiring

Yellow & White / State of

Charge (DC 12V)

Black / Ground wire connect to the

vehicle body or the engine (it must

be a good ground)

Brown / “+” Wire connect

key on DC 12V  main 

power switch 

Green / Fuel

White / Neutral light (-)

Meter (Accessory 1)

Main switch wiring reference:

Fuel indicator wiring reference:

Red

Red

Red

Red

Red

Red / White

White

Brown

Red / Black

Black

Black

Black

Orange

Brown

Black

Green

Green

Green

Green

Black

Black / Yellow

Power

Key On

Ground

1. LCD meter (Accessory 1)

2. Meter bracket (Accessory 11)

3. M5 washer x 2 (Accessory 17)

4. M5 x P0.8 nut x 2 (Accessory 15)

5. M6 x 18L screw (Accessory 14)

6. M6 washer (Accessory 18)

Use the meter bracket  (Accessory 11), handle bar clamp

(Accessory 12), rubber  (Accessory 13) and M6 x P1.0 nut (Accessory 16)

to install the speedometer on the handle bar.

Use the aluminum bushings (Accessory 11) to install the speedometer on

the handle bar stem.

The RPM wire installation

A.  Wrap the RPM wire at least 5 times around the spark plug. 

A1.  Use tape to fix the RPM (Type A) wire onto the spark plug wire.

A2.  Use tape to fix the RPM wire (Type A) on the spark plug cap.

A3.  Use tape to fix the RPM wire (Type A) on the coil positive pole wire. For some models with the coil negative wire, tape 

        the RPM wire (Type A) on the negative wire to get the RPM signal.

B.   Connect the RPM wire (type B) to the ignition coil positive pole.

B1.  Wrap the RPM wire (type B) on the spark plug wire by connecting the male and female connector.

C.  Connect the RPM wire (Type A) to the pick up.

D.  Parallel the RPM wire (Type A) with the original tachometer signal wire (This method is available only when the original 

      speedometer comes with a tachometer on it. You can get the RPM wire information from the service manual of your bikes.)

E.  For the models comes with the new ignition coil, wrap the RPM wire (Type A) at least 5 times around the spark plug as the above drawing.

F.  Use the method mentioned above to install the RPM wire, and then connect the ground wire to the frame body or the engine. 

 

(make sure that you have a good ground.)

    For multi-ignition models, we suggest that you to get the signal on the first ignition.

    The best signal source will be in order as D>C>B>A, we suggest you to check different ways if you have problems to get the RPM signal.

The temperature will disappear if you don't install & connect the temperature sensor with the meter.
When connecting the power wiring, please follow the instruction. If you connect the red & brown wiring in parallel will cause the meter work improperly.

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