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17 TUNING THE ENGINE 108
Adjust the idle speed with adjusting screw
.
Guideline
Choke function deactivated The choke lever is pushed in all the way. ( p. 17)
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.
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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.
17.5 Emptying the carburetor float chamber
Danger
Fire hazardFuel 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 poisoningFuel 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 has been contaminated with
fuel. Store fuel properly in a suitable canister and keep away from children.
Warning
Environmental hazardImproper handling of fuel is a danger to the environment.
Do not allow fuel to get into the ground water, the ground, or the sewage system.
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Carry out this work with a cold engine.
Water in the float chamber results in malfunctioning.
Preparatory work
Turn handle
of the fuel tap to the OFF position. (Figure 602702-10 p. 17)
Fuel no longer flows from the fuel tank to the carburetor.
B01158-10
Main work
Place a cloth beneath the carburetor to soak up emerging fuel.
Remove plug
.
Completely drain the fuel.
Mount and tighten the plug.
110


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