KTM 65 SX 1999, Руководство пользователя

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15 TUNING THE ENGINE
66
15.3 Carburetor - idle
601965-10
The idle setting of the carburetor has a big influence on the starting behavior, stable
idling and the response to throttle opening. That 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 idle speed is adjusted with adjusting screw

.
The idle mixture is adjusted with idle adjusting screw

.
15.4 Carburetor - adjusting the idle speed
601965-10
–
Screw in idle air adjusting screw

all the way and turn it to the specified basic
position.
Guideline
Idle air adjusting screw
Open 3.5 turns
–
Run the engine until warm.
Guideline
Warm-up time
≥
5 min
Danger
Danger of poisoning Exhaust gases are toxic 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 the adjusting screw

.
Guideline
Choke function deactivated
–
The choke lever is pushed up all the way.
( p. 12)
Idle speed 1,400… 1,500 rpm
–
Turn idle air adjusting screw  slowly in a clockwise direction until the idle speed
begins to fall.
–
Note the position and turn the idle air adjusting screw slowly counterclockwise until
the idle speed falls again.
–
Adjust to the point between these two positions with the highest idle speed.
Info
If the engine speed rises considerably, reduce the idle speed to a normal
level and repeat the above steps.
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 air adjusting screw to the end without any change of
engine speed, you need to install a smaller idling jet.
After changing the idling jet, start from the beginning with the adjusting
steps.
Following extreme air temperature or altitude changes, adjust the idle speed
again.