APRILIA RS 250 - 1998 Manual page 57

Loosen the two lock nuts (4).
Act on the adjusters (5) and adjust the
chain slack, making sure that the refe-
rence marks (2-3) are correctly positio-
ned on both sides of the vehicle.
Tighten the two lock nuts (4).
Tighten the nut (1).
Wheel nut driving torque:
100 Nm (10 kgm).
Check the chain slack, see p. 56 (CHE-
CKING THE SLACK).
CHECKING THE WEAR OF CHAIN,
PINION AND CROWN
Further, check the chain and sprockets
and make sure that they do not present:
Damaged rollers.
Loose pins.
Dry, rusty, crushed or seized links.
Excessive wear.
Lacking O rings.
Sprocket or teeth excessively worn or
damaged.
a
If the chain rollers are damaged,
the pins are loose and/or the O
rings are damaged or lacking, it
is necessary to change the whole chain
unit (both sprockets and chain).
a
Lubricate the chain frequently,
especially if there are dry or
rusty parts. The crushed or
seized links must be lubricated and
made work again.
If this is not possible, contact an aprilia
Official Dealer, who will provide for
changing the chain.
Finally, check the wear of the rear fork
protection shoe.
LUBRICATION AND CLEANING
a
The drive chain is provided with
O rings among the links, in order
to keep the grease inside them.
Carry out the adjustment, lubrication,
cleaning and change of the chain with
great care.
Lubricate the chain every 500 km (312 mi)
or whenever necessary.
Lubricate the chain with spray grease for
chains provided with sealing rings, or with
SAE 80W-90 oil.
a
The lubricants for chains availa-
ble on the market can contain
substances that are dangerous
for the rubber sealing rings of the chain.
Never wash the chain with water jets,
steam jets, high-pressure water jets and
highly inflammable solvents.
use and maintenance RS 250 57