Inspecting The Valves; Residual Stroke Check - APRILIA SR MAX 125 ie Service Station Manual

Engine

Inspecting the valves

NOTE
THE RESIDUAL STROKE OF THE INTAKE SPRINGS MUST
RANGE BETWEEN 0.8 - 1.8 MM SO THAT THERE ARE NO
RESONANCES. TO SOLVE THIS, THE SPRING IS SHIM-
MED WITH CALIBRATED WASHERS: 0.4 - 0.8 - 1.2 MM

RESIDUAL STROKE CHECK

Follow these steps to check the residual stroke:
- Fit the specific tool on the head and fasten the
dial gauge
Specific tooling
020688Y Dial gauge support
- Check that the dial gauge is adequately posi-
tioned, that is as parallel as possible to the valve
axis, and the cap must be within the level area.
- Turn the crankshaft until the Intake valves are at their maximum lift.
NOTE
USING A DIAL GAUGE IDENTIFY THE MAXIMUM LIFT AND LOCATE THE EXACT POINT AT
WHICH THE NEEDLE STARTS TURNING IN THE OPPOSITE SENSE.
ENG - 136
SR MAX 125 ie