15 TUNING THE ENGINE 73
Guideline
Choke function deactivated – The choke lever is pushed in to the stop. ( p. 13)
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.
15.5 Emptying the carburetor float chamber
Danger
Fire hazard Fuel is highly flammable.
The fuel in the fuel tank expands when warm and can escape if overfilled.
– Do not refuel the vehicle in the vicinity of open flames or lit cigarettes.
– Switch off the engine for refueling.
– Make sure that no fuel is spilled; particularly not on hot parts of the vehicle.
– If any fuel is spilled, wipe it off immediately.
– Observe the specifications for refueling.
Warning
Danger of poisoning Fuel is poisonous and a health hazard.
– Avoid skin, eye and clothing contact with fuel.
– Immediately consult a doctor if you swallow fuel.
– Do not inhale fuel vapors.
– In case of skin contact, rinse the affected area with plenty of water.
– Rinse the eyes thoroughly with water, and consult a doctor in case of fuel contact with the eyes.
– Change your clothing in case of fuel spills on them.
– Keep fuels correctly in a suitable canister, and out of the reach of children.
Warning
Environmental hazard Improper handling of fuel is a danger to the environment.
– Do not allow fuel to enter the groundwater, the soil, or the sewage system.
Info
Carry out this work with a cold engine.
Water in the float chamber results in malfunctioning.
Preparatory work
–
Turn tap handle
on the fuel tap to the OFF position.
(Figure S01157-10 p. 12)
No more fuel flows from the fuel tank to the carburetor.
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