TUNING THE ENGINE 75
601379-10
The idle speed is adjusted with adjusting screw .
14.4Carburetor - adjusting the idle speed x
601377-10
– Screw in idle adjusting screw until it stops and then to the prescribed basic set-
ting.
Guideline
Idle mixture adjusting screw
Open 1.5 turns
– Run the engine until warm.
Guideline
Warm-up time ≥ 5 min
Danger
Danger of poisoning Exhaust gases are poisonous and inhaling them may
result in unconsciousness and/or death.
– When running the engine, always make sure there is sufficient ventila-
tion, and do not start or run the engine in an enclosed space without an
effective exhaust extraction system.
– Adjust the idle speed with adjusting screw .
Guideline
Choke function deactivated – The choke lever is pushed back to the
stop. ( p. 19)
Idle speed 1,550… 1,650 rpm
– Turn idle adjusting screw slowly clockwise 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 ¼ 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 fit 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 lever is pushed back to the
stop. ( p. 19)
Idle speed 1,550… 1,650 rpm
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