15 TUNING THE ENGINE 68
15.1 Checking the play in the throttle cable
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– Check the throttle grip for smooth operation.
– Move the handlebar to the straight-ahead position. Move the throttle grip back-
wards and forwards to ascertain play A in the throttle cable.
Throttle cable play 3… 5 mm (0.12… 0.2 in)
» If the throttle cable play does not meet specifications:
–
Adjust the play in the throttle cable. x ( p. 68)
15.2 Adjusting the play in the throttle cable x
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– Move the handlebar to the straight-ahead position.
– Push back sleeve 1.
– Ensure that the throttle cable sleeve is pushed all the way into barrel adjuster 2.
– Loosen nut 3.
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– Turn adjusting screw 2 in such a way there is throttle cable play A in the throttle
grip.
Guideline
Throttle cable play 3… 5 mm (0.12… 0.2 in)
– Tighten nut 3.
– Slide on sleeve 1.
15.3 Carburetor - idle
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The idle setting of the carburetor has a big influence on the starting behavior, stable
idling and the response to throttle opening. This means that an engine with a correctly
set idle speed is easier to start than if the idle is set wrongly.
Info
The carburetor and its components are subject to increased wear caused by
engine vibration. Wear can result in malfunctioning.
The carburetor's factory setting matches the following values.
Height above sea level 500 m (1,640 ft)
Ambient temperature 20 °C (68 °F)
Super unleaded gasoline (98 octane), mixed with 2-stroke engine oil (1:40)
( p. 86)
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Idling range A
Operation when throttle side is closed. This range is affected by adjusting screw 1 and
idle air adjusting screw 2.
Transitional range B
Engine behavior when the throttle slide is opened. This range is affected by the idling
jet and throttle slide.
If, despite good idling and part-load settings, the engine starts to stutter and smoke
heavily when the throttle slide is opened, and if it reaches full performance at high
engine speeds suddenly, the carburetor is not being regulated leanly enough, the float
level is too high or the float needle valve is leaky.
Part-load range C
Operation when throttle side is partially open. This range is affected by the jet needle
(shape and position). In the lower range, the idle setting affects engine tuning; in the
upper range, it is the main jet.
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