Adjusting The Idle - VESPA S 50 4T 4V (2008) Manual

Engine
- Insert rubber pipes for chamber ventilation.
- Insert the O-Ring, the washer, the spring and the
idle flow screw in their seatings.
- Refit the carburettor on the engine and connect
again the accelerator cable with the sheath and the
support plate and the electrical connection of the
starter.
- Reconnect the fuel supply pipe and tighten the 2
clamping screw fixing the carburettor to the inlet
manifold and the air inlet coupling to the filter.

Adjusting the idle

- The engine does not require frequent idle speed adjustments, but it is essential to strictly follow certain
rules when adjusting the idle speed.
- Before adjusting the carburettor make sure to respect requirements on lubrication, valve clearance,
and complying timing; spark plug should be in optimum conditions, air filter clean and sealed, and the
exhaust system tight.
- Connect the tester thermometer to the sump, us-
ing a cover with oil expressly prepared for probes.
- Start the engine and before adjusting the idle
speed, make sure that the oil temperature is be-
tween 70÷80 °C.
Specific tooling
020331Y Digital multimeter
ENG - 120
Vespa S 50 4T 4V (2008)