Drive Chain - APRILIA RS 250 - 1998 Manual

DRIVE CHAIN

Carefully read p. 47 (MAINTENANCE).
The vehicle is equipped with an endless
chain, in which a ring link joint is not used.
a
An excessive slackening of the
chain can cause it to come off of
the sprockets, which often re-
sults in accidents or serious damage to
the vehicle.
Periodically check the slack and adjust
it if necessary, see p. 56 (ADJUST-
MENT).
To change the chain, contact an aprilia
Official Dealer, who will ensure you
prompt and accurate servicing.
a
I n c o r r e c t m a i n t e n a n c e m a y
cause the untimely wear of the
chain and/or damages to the pin-
ion and/or the crown.
Carry out the maintenance operations
56 use and maintenance RS 250
more frequently if you use the vehicle in
difficult conditions or on dusty and/or
muddy roads.
CHECKING THE SLACK
To check the slack, proceed as follows:
Stop the engine.
Position the vehicle on the stand, see
p. 46 (POSITIONING THE VEHICLE ON
THE STAND).
Position the shifting lever in neutral.
Make sure that the vertical oscillation, in
an intermediate point between pinion
and crown in the lower part of the chain,
is about 25 ¸ 35 mm.
Move the vehicle forwards, or turn the
wheel, in order to be able to check the
vertical oscillation of the chain even
when the wheel turns; the slack must be
constant in all the rotation phases of the
wheel.
a
If in some positions the slack is
higher than in others, this means
that there are crushed or seized
links; in this case, contact an aprilia Of-
ficial Dealer. To prevent the risk of sei-
zures, lubricate the chain frequently, see
p. 57 (LUBRICATION AND CLEANING).
If the slack is uniform, but higher or lower
than 25 ¸ 35 mm, adjust it, see p. 56 (AD-
JUSTMENT).
ADJUSTMENT
c
To adjust the chain it is neces-
sary to use the appropriate rear
&
support stand .
If after the check it is necessary to adjust
the chain tension, proceed as follows:
Position the vehicle on the appropriate
&
rear support stand , see p. 49 (POSI-
TIONING THE VEHICLE ON THE REAR
&
SUPPORT STAND ).
Loosen the nut (1) completely.
c
For the wheel centering fixed re-
ference marks (2-3) are provi-
ded, which can be seen inside the chain
tightener seats on the rear fork arms,
before the wheel pin.