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1 Probe ceramics
2 Electrodes
3 Contact
4 Housing contact
5 Exhaust pipe
6 Protective ceramic
layer (porous)
7 Emission
8 Air
Pulse generator (crankshaft)
The pulse generator
side of the engine. It is an inductive sensor, i.e. the control unit
2
calculates the speed and the crankshaft position based on the output
signal.
The pulse generator wheel
the pulse generator. The distance between its 22 teeth is equal with a
larger gap between two teeth.
Each tooth induces a signal; the large interval is caused by the gap in
1
the teeth since the distance between 2 teeth is much larger in this
position; this signal is used to determine the crankshaft position.
T
HE
PICKUP
DIFFERENTIATED BY THE POSITION OF THE
INTERCHANGED
Lambda probes
The lambda probes screwed into the exhaust after each cylinder
measure the partial oxygen pressure in the emission compared to the
ambient air, i.e. the sensors compare the oxygen content in the
emission with the fresh air.
A lambda probe basically consists of a ceramic body coated on both
sides with a platinum layer. The platinum layer acts like an electrode.
The outer layer comes into contact with the emission, the inner layer
with the ambient air.
The ceramic body becomes electro-conductive from a temperature of
approx. 350º C; voltage is generated if the oxygen content between the
ambient air (inner electrode) and emission (outer electrode) varies.
The higher the difference in the oxygen level, the greater the voltage;
the lambda probe voltage can lie between 0 and 1 volt in operation.
Normally the lambda probe voltage will fall between 0.2 volt for a lean
combustion and approx. 0.8 volt for a rich combustion.
NOTE:
– For lean mixtures (excess air) only part of the drawn in oxygen is
required for combustion; a large share of oxygen remains in the
emission - resulting in a low lambda probe voltage.
– For rich mixtures (air deficiency) almost all of the oxygen is burned;
hardly any oxygen remains in the emission - resulting in a high
lambda probe voltage.
The ideal operating temperature for a lambda probe is at approx.
600º C, although up to 950º C is possible for short durations.
To reach the operating temperature as quickly as possible, the lambda
probes used in this motorcycle are equipped with a heater switched on
by the control unit.
NOTE: The ceramic body of the lambda probe is very sensitive to shock
which is why it is covered with a slotted sheet-metal sleeve.
is located under the clutch cover on the right
1
on the crankshaft is the counterpart of
2
!
CAUTION
RING
FOR
THE
CARBURATOR
.
7-39
!
AND
INJECTION
VERSIONS
ARE
"
";
TOOTH GAP
THEY CANNOT BE
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Table of Contents
Troubleshooting
