PIAGGIO MP3 500 i.e. SPORT, Service Station Manual

Page: 51 / 432

To control the valve, it is preferable to it, alterna-
tively just access the manifold side pipe.
•
Connect the MITY-VAC pump on the
engine side duct.
•
Select the pump command on the "vac-
uum" position, then slowly apply vac-
uum up to the valve threshold check
opening.
If you detect different pressures, replace the valve.
Note: An opening vacuum that is too high, causes
a lack of regeneration of the activated carbon; vice
versa, an opening vacuum that is too low, increa-
ses the flow of air to the engine causing the thin-
ning of idle.
Characteristic
Standard opening vacuum
(2.90-3.77)PSI (20-26)kPa (200-260)mbar
Roll-over valve check
The valve must enable the following results:
•
Aeration of the tank while riding (the ambient air enters the tank in relation to the volume of
fuel used).
•
Pressurisation of the tank (while riding or during a break, you may experience increases in
the temperature inside the tank. The valve must pressurize the tank to limit the escape of
fuel vapour to the canister).
•
Prevent pollution of the canister with the liquid fuel (in case of fall of the vehicle, the valve
must block the connection with the canister).
To control the valve, it is necessary to remove it
from the vehicle.
For the check, it is planned to use a MITY-VAC
pump and a piece of tube, then proceed as follows:
•
Connect the MITY-VAC pump to the
lower joint of the safety valve (white).
•
Select the "vacuum" control position
and keeping the valve in the vertical
axis, check that it is possible to intake
MP3 500 i.e. SPORT Business_LT_ ABS-ASR_EU_USA (2015)
Maintenance
MAIN - 51