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16
TUNING THE ENGINE
16.5
Emptying the carburetor float chamber
Danger
Fire hazard Fuel is highly flammable.
–
Never refuel the vehicle near open flames or burning cigarettes, and always switch off the engine first. Be careful that no
fuel is spilt, especially on hot vehicle components. Clean up spilt fuel immediately.
–
The fuel in the fuel tank expands when warm and may emerge if overfilled. Follow the instructions on refueling.
Warning
Danger of poisoning Fuel is poisonous and a health hazard.
–
Fuel must not come into contact with the skin, eyes, or clothing. Do not breathe in the fuel vapors. If contact occurs with
the eyes, rinse with water immediately and contact a physician. Immediately clean contaminated areas on the skin with
soap and water. If fuel is swallowed, contact a physician immediately. Change clothing that is contaminated with fuel.
Store fuel properly in a suitable canister and keep away from children.
Guideline
Idle air adjusting screw (125 SX EU, 125 SX US)
Open
Idle air adjusting screw (150 SX EU, 150 SX US)
Open
Idle air adjusting screw (250 SX EU, 250 SX US)
Open
Idle air adjusting screw (250 XC EU/US)
Open
Idle air adjusting screw (300 XC EU/US)
Open
–
Run the engine until warm.
Guideline
Warm-up time
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 adjusting screw
Guideline
Choke function deactivated – The choke lever is pushed in to the stop. (
Idle speed
–
Turn idle air adjusting screw
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 there is a large engine speed rise, 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, repeat the adjusting steps from the beginning.
Following extreme air temperature or altitude changes, adjust the idle speed
again.
x
2 turns
2 turns
2 turns
2 turns
2 turns
≥ 5 min
.
1,400... 1,500 rpm
slowly in a clockwise direction until the idle speed
85
p. 15)
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