PIAGGIO 500 cc - Head Check; Checking the Valve Sealing Surfaces

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7
Head check
- Check that the head surface shows no signs of wear
or deformations by means of a ground bar and a
feeler gauge.
Maximum allowed runout: 0.1 mm
- In case of troubles, replace the head.
- Check the sealing surface of the intake and exhaust
manifold.
- Check that the camshaft and equalizer pin supports
show no signs of wear.
- Check that the head cover surface shows no signs of
wear.
- Check that the coolant sealing pad shows no signs of
oxidation.
Checking the valve sealing surfaces
- Visually check the valves sealing surfaces.
- Do not change the valves assembly
position (RH-LH).
- If the valve sealing surface is discontinued in one or
more points, or if it is bent, replace the valve.
05_197
05_198
05_199
Warning
Thermal unit and timing system
Standard diameter
A13
+ 0.018
B20
+ 0.021
C42
+ 0.025
0
0
0
- If worn, also check the corresponding component
when the head is replaced