Valve-Guide Play Check; Valve Standard Length - PIAGGIO 500 cc Service Manual

Gruppo termico e distribuzione
- Check the valve head concentricity by placing a dial
gauge at right angle to the valve head and turning the
valve head on a "V" surface.
Limit allowed: 0.03 mm

Valve-guide play check

- After measuring the valve guide and valve stem
diameters, check the guide-and-stem play.
Intake:
Standard play: 0.013 - 0.04 mm
Limit allowed: 0.08 mm
Exhaust:
Standard play: 0.025 - 0.052 mm
Limit allowed: 0.09 mm
- Check that the surface in contact with the register
articulated terminal shows no signs of wear.

Valve standard length

Intake: 95.0 ± 0.3 mm
Exhaust: 94.2 ± 0.3 mm
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