55
DRIVE CHAIN
An excessive slackening of the chain can
make it come out of the pinion, which of-
ten results in accidents or serious dam-
ages to the vehicle. Periodically check the slack
and if necessary adjust it (page 56).
To change the chain, contact your aprilia Offi-
cial Dealer, who will ensure you careful and
prompt servicing.
Read page 50 carefully.
The RS 125 is provided with a chain in which a ring
link joint is used.
If maintenance operations are not performed proper-
ly, the chain may wear untimely or the pinions may
be damaged.
Provide for maintenance 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 side
stand and put the gears into neutral;
– make sure that the vertical oscillation, in an inter-
mediate point between pinion and crown in the
lower part of the chain, is about 25 mm (Fig. 31);
– move the vehicle forward, in such a way as to be
able to check the vertical oscillation of the chain
also when the wheel turns; the slack must be con-
stant in all the wheel rotation phases.
If in some sections the slack is greater than in others,
this means that there are crushed or seized links. To
eliminate the risk of seizures, lubricate the chain fre-
quently (see page 57).
If the slack is uniform and greater than prescribed,
carry out the adjustment (see page 56).
If the chain is disassembled and then reassembled,
make sure that the clip of the connection link is
mounted with its open part opposite to the direction
of advancement (Fig. 31).
a
Fig. 31
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