Adjusting The Idle - Derbi boulevard 125 4t Workshop Manual

Engine
Check the automatic starter: Kehin: Protrusion
value
XX ÷ XX mm at approx. 20°C
Check the automatic starter: Kehin maximum
protrusion
XXX ÷ XXX mm
Check the automatic starter: Keihin maximum
time
5 min

Adjusting the idle

- The engine does not require frequent adjustment
of the idle, however it is important that this adjust-
ment be made in complete compliance with a few
rules.
- Before adjusting the carburettor make sure that
the following conditions are met: good lubrication,
valve play and distribution timing conform, spark
plug in excellent conditions, air filter clean and
sealed, exhaust system completely sealed. -
Warm up the engine for at least 5 minutes at
around 50 Km/h.
- Connect the vehicle to an exhaust analyser in-
serting the analyser probe into a extension hose
fitted airtight to the outlet of the silencer.
- Connect the thermometer of the multimeter
(020331y) to the sump, using the oil cap specifi-
cally made for insertion of the probe.
- Start the engine before adjusting the idle speed,
making sure the oil temperature is between 70 - 80
°C.
- Using the analyser revolution counter or a sepa-
rate one (020332y), adjust the idle until obtaining
a speed of 1600 - 1700 rpm.
- Adjust the flow screw until obtaining a percentage
of carbon monoxide (CO) of 3.1
ENG - 154