Montesa COTA 4RT RACE REPLICA, Owner'S Manual

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6-14 6-14
Electrical servicing
If there is no pulse voltage, check the following:

Air gap.
 The Blue wire in case there is an open circuit or short
circuit.
 The Red wire in case there is an open circuit.
If the wires are working properly, check the speed sensor.
Checking the air gap
Safely support the motorcycle with a lifting device or
equivalent and raise the wheel off the ground.
Measure the gap (air gap) between the sensor and the
pulse generator ring at different points by turning the
wheel slowly.
It must be within the specification.
Standard: 0.5 – 1.5 mm (0.031 – 0.035 in)
The air gap cannot be adjusted.
If it is not within the specification, check whether there
are deformities, damage or if any of the parts assembled
are loose.
Speed sensor
System check
NOTICE

Before starting this inspection, check the inspection of
the speedometer system.

Do not disconnect the connectors 6P and 3P of the
speedometer during the checks.
Shift the transmission into neutral.
Start the engine, with the connectors 6P and 3P of the
speedometer connected, measure the voltage between
the following terminals of the connector 3P of the
speedometer.
Connection: Red (+) and Blue (-)
Turn the rear wheel slowly and manually. A pulse voltage
between 0 and 5 V is required.
If the pulse voltage appears, replace the speedometer.
(1) SPEED SENSOR (1) CONNECTOR 6P
Power input line
Measure the voltage between the connector 6P of the
speedometer and the ground.
Connection: White/Red(+) – Ground (–)
With the engine on, around 12V should be received.
If there is no voltage, check the existence of an open
circuit in the White/Red wire.
Ground line
Measure the continuity between the connector 6P of the
speedometer and the ground.
Connection: Green – Ground
There must be continuity at all times.
If there is no continuity, check the existence of an open
circuit in the green wire.
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1