Valve Check - APRILIA RS 125 Euro 4 Service Manual

Engine

Valve check

•
Measure the width of the sealing surface on the valve seats and on the valves themselves.
•
If the sealing surface on the valve is wider than the specified limit, damaged in one or more
points or curved, replace the valve with a new one.
CAUTION
DO NOT CHANGE THE VALVE FITTING POSITION (RH - LH).
Characteristic
Minimum diameter allowed - Intake
3.96 mm (0.1559 in)
Minimum diameter allowed - Exhaust:
3.95 mm (0.1555 in)
Standard clearance - Intake
0.15/0.20 mm (0.0059/0.0079 in)
Standard clearance - Exhaust
0.20/0.25 mm (0.0079/0.0098 in)
Maximum clearance admitted - Intake:
0.060 mm (0.0023 in)
Maximum clearance admitted - Exhaust:
0.070 mm (0.0027 in)
•
Remove the head cover.
•
Bring the engine to reach the top dead
centre and lock it at that position using
the specific tool (4).
Specific tooling
864567 Camshaft timing adjustment lock pins
•
Use a feeler gauge to check clearance
on the four valves.
•
If the values measured differ from the
values specified, record the difference
between MAXIMUM ALLOWED
CLEARANCE e CLEARANCE MEAS-
URED.
ENG - 206
RS 125 - Tuono 125 - Euro 4