Chain Backlash Check - APRILIA RS 660 2020 Manual

Chain backlash check (04_43, 04_44)

To check the clearance:
•
Shut off the engine.
•
Rest the vehicle on the side stand.
•
Select neutral.
•
Check that the vertical deflection of the bottom section of the chain, measured
at a distance of 250 mm (9.84 in) from the centre of the rear wheel axle (along
imaginary line between centres of front and rear sprockets), is approximately
30 mm (1.18 in).
04_43
CAUTION
WHEN CHECKING THE DEFLECTION OF THE CHAIN, THE CHAIN MUST NOT
BE ABLE TO TOUCH THE UNDERSIDE PART OF THE SWINGARM IN THE PO-
SITION INDICATED BY THE ARROW.
•
Move the vehicle forwards to check the vertical deflection of the chain in other
positions; the chain deflection must be constant throughout the entire rotation
of the wheel.
if the clearance is uniform, but greater or less than 30 mm (1.18 in), carry out the
adjustment.
CAUTION
IF THE CLEARANCE IS GREATER IN SOME POSITIONS IT MEANS THAT SOME
ELEMENTS OF THE CHAIN ARE CRUSHED OR HAVE SEIZED UP. IN THIS CASE
THE CHAIN SHOULD BE REPLACED.
04_44
LUBRICATE THE CHAIN REGULARLY TO PREVENT THE RISK OF SEIZURE.
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