APRILIA SR MAX 125 ie Service Station Manual page 138

Engine
RESIDUAL STROKE OVER 1.7 mm
- Replace the calibrated washer with a thicker one
so that it is within the residual stroke values.
RESIDUAL STROKE SMALLER THAN 0.9 mm
- Replace the calibrated washer with a thinner one
so that it is within the residual stroke values. -
USE LIMITS
- Replace the head if values exceed the use limits
of the residual stroke.
CAUTION
CHECK BOTH INTAKE VALVES.
ADJUST EACH TIME A VALVE OR ANY COMPONENT OF
THE VALVE RETURN MECHANISM HAS TO BE RE-
PLACED.
WHEN THE CALIBRATED WASHER IS REPLACED, THE
VALVE SEAL RING MUST BE REPLACED AS WELL.
WHEN A NEW HEAD OR VALVE IS FITTED, THE 0.8-mm
WASHER HAS TO BE CHECKED.
NEVER INSERT MORE THAN ONE WASHER IN THE SAME
SEAT.
Characteristic
Residual stroke:
0.8 - 1.8 mm
- Refer to the «Engine / Thermal group and timing system / Valve removal» page to see the re-
placement steps
See also
NOTE
TO MEASURE WEAR LIMITS AND COUPLING CLEARANCES, SEE THE SPECIFICATIONS CHAP-
TER.
See also
- Check that the upper and lower supporting spring
washers, the cotters and the oil seal show exhibit
no signs of abnormal wear. Replace a component
when worn.
NOTE
TO MEASURE WEAR LIMITS AND COUPLING CLEARANCES, SEE THE SPECIFICATIONS CHAP-
TER.
See also
ENG - 138
SR MAX 125 ie