Drive Chain Adjusting - APRILIA RS4 50 2011 Workshop Manual

Chassis
Adjusting
To check clearance:
•
Shut off the engine.
•
Rest the vehicle on its stand.
•
Engage neutral gear.
•
Check vertical oscillation, midway be-
tween pinion and sprocket, in the lower
chain length.
•
If the chain clearance is less than 18
mm (0.71 in) or exceeds 22 mm (0.87
in), adjust the chain.
•
Move the vehicle forward so as to
check vertical oscillation of the chain in
other positions too. clearance should
remain constant at all wheel rotation
phases.
CAUTION
IF CLEARANCE IS GREATER AT SOME POSITIONS, THIS
MEANS THAT SOME CHAIN LINKS ARE FLATTENED OR
JAMMED.
TO AVOID RISK OF SEIZURE, LUBRICATE THE CHAIN ON
A REGULAR BASIS.
CAUTION
GET A SPECIFIC REAR SERVICE STAND (OPT) TO AD-
JUST THE CHAIN.
If you need to adjust the chain tension after the
check, perform the following.
•
Place the vehicle on its optional rear
service stand.
•
Working from both sides, loosen the
nut (1) completely.
•
Actuate on the adjuster screws (2) and
adjust the chain clearance according to
the references (3).
•
Check that the references (3) are
aligned on both sides.
•
Then tighten the nuts (1).
CAUTION
IF CLEARANCE IS GREATER AT SOME POSITIONS, THIS
MEANS THAT SOME CHAIN LINKS ARE FLATTENED OR
JAMMED.
TO AVOID RISK OF SEIZURE, LUBRICATE THE CHAIN ON
A REGULAR BASIS.
CHAS - 172
RS4 50 MY2011