APRILIA SCARABEO 125 - PART 2 1999 Manual page 46

Carefully read p. 37 (MAINTENANCE).
Adjust the idling every time it is irregular.
To carry out this operation, proceed as fol-
lows:
N
Ride for a few miles until reaching the
normal running temperature, see p. 15
(Coolant temperature indicator " "),
then stop the engine.
N
Remove the central inspection cover,
see p. 47 (REMOVING THE CENTRAL
INSPECTION COVER).
N
Connect an electronic revolution counter
to the spark plug cable.
N
Start the engine.
50
use and maintenance Scarabeo 125 - Scarabeo 150
The engine minimum rpm must be approx-
imately the following 1600 ± 50 rpm.
In this case the engine does not make the
rear wheel rotate.
If necessary:
N
Working on the front left side of the vehi-
cle, adjust the screw (1) positioned on
the right side of the carburettor.
By SCREWING IT (clockwise), you in-
crease the engine rpm.
By UNSCREWING IT (anticlockwise),
you decrease the engine rpm.
N
Act on the throttle grip, accelerating and
decelerating a few times to make sure
that it functions correctly and to check if
the idling speed is constant.
NOTE
Do not act on the air adjusting
screw, to avoid variations of the carbura-
tion setting.
If necessary, contact your aprilia Official
Dealer.
Carefully read p. 37 (MAINTENANCE).
The idle stroke of the throttle grip must be
2 – 3 mm, measured on the edge of the
grip itself.
If this is not the case, proceed as follows:
N
Position the vehicle on the centre stand.
N
Withdraw the protection element (2).
N
Loosen the lock nut (3).
N
Rotate the adjuster (4) in such a way as
to restore the prescribed value.
N
After the adjustment, tighten the lock nut
(3) and check the idle stroke again.
N
Put back the protection element (2).
WARNING
After the adjustment, make sure that the
rotation of the handlebar does not mod-
ify the engine idling rpm and that the
throttle grip returns smoothly and auto-
matically to its original position after
being released.