MAINTENANCE WORK ON CHASSIS AND ENGINE 66
8.81Carburetor - adjusting the idle speed x
– Turn handle of the fuel tap to the R REAR position. (Figure 600016-10 p. 18)
– Remove the front fuel tank. ( p. 56)
600105-10
– Screw in idle adjusting screw until it stops and then to the prescribed basic set-
ting.
Guideline
Idle mixture adjusting screw
Open 2 turns
– Let the engine run until it is warm.
Guideline
Warm-up time ≥ 5 min
600106-10
– Adjust the idle speed with adjusting screw .
Guideline
Choke function deactivated – The choke knob is engaged in the guide. ( p. 18)
Idle speed 1,600… 1,700 rpm
600105-10
– Turn idle adjusting screw slowly until the idle speed begins to fall.
– Note the position and turn the idle adjusting screw slowly counterclockwise until
the idle speed falls.
– Adjust to the point between these two positions with the highest idle speed.
Info
If there is a big engine speed rise, reduce the idle speed to a normal level
and repeat the above steps.
The extreme sport motorcyclist will set the mixture about 1/4 of a turn back
from this ideal value (leaner, in a clockwise direction) since the engine
becomes hotter in sporting use.
If the procedure described here does not lead to satisfactory results, the
cause may be a wrongly dimensioned idling jet.
If you can turn the idle adjusting screw to the end without any change of
engine speed, you have to insert a smaller idling jet.
The idle adjusting screw must not be opened more than two turns. If more
than two turns are necessary (rich mixture), use a larger idling jet.
After changing the idling jet, start from the beginning with the adjusting
steps.
– Adjust the idle speed with adjusting screw .
Guideline
Choke function deactivated – The choke knob is engaged in the guide. ( p. 18)
Idle speed 1,600… 1,700 rpm
Info
Following extreme air temperature or altitude changes, adjust the idle speed
again.
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