Characteristic
Check the auto starter: Protrusion Value for
Walbro
12.5 ÷ 13 mm at approx. 20°C
Check the automatic starter: Walbro maximum
protrusion
18.5 ÷ 19 mm
Check the automatic starter: Walbro max. time
5 min
Electric characteristic
Walbro Resistance
approx. 40 Ω
Adjusting the idle
- The engine does not need frequent idle adjust-
ments, however it is very important to make any
adjustments fully respecting some standards.
- Before adjusting the carburettor make sure to re-
spect the lubrication requirements, valve clear-
ance, and complying timing, spark plug should be
in optimum conditions, air filter clean and sealed,
and the exhaust system tight.
- Warm up the engine by running it at least 5 mi-
nutes at approximately 50 kph.
- Connect the vehicle to the exhaust fumes analy-
ser inserting the probe into a sealed extension pipe
placed at the muffler exit end.
- Connect a millimetre thermometer (020331y) on
the sump, using a cover with oil expressly pre-
pared for probes.
- Start the motor and before adjusting the idle
speed make sure that the oil temperature is be-
tween 70 ÷ 80°C.
- Using the rpm indicator or any other instrument
(020332y), adjust the idle screw to obtain 1600
rpm ÷ 1700 rpm
- Adjust the flow screw until the carbon monoxide
(CO) percentage is 3.1 ÷ 4.5%, when the screw is
Vespa GT 125-200 Engine
ENG - 191
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