Checking The Valves And Valve Guides - Yamaha XP500 Service Manual

Hide thumbs Also See for XP500:

Table of Contents

VALVES AND VALVE SPRINGS

Identify the position of each part very carefully

so that it can be reinstalled in its original place.

CHECKING THE VALVES AND VALVE

The following procedure applies to all of the

valves and valve guides.

To ease valve guide removal and installation,

and to maintain the correct fit, heat the cylinder

head to 100 °C (212 °F) in an oven.

• valve retainer 1

• valve spring 2

• valve stem seal 3

• valve spring seat 4

• valve-stem-to-valve-guide clearance

Valve-stem-to-valve-guide clearance =

Valve guide inside diameter a –

Valve stem diameter b

Out of specification → Replace the valve

Valve-stem-to-valve-guide clear-

0.010 ~ 0.037 mm

(0.0004 ~ 0.0015 in)

<Limit>: 0.080 mm (0.0031 in)

0.025 ~ 0.052 mm

(0.0010 ~ 0.0020 in)

<Limit>: 0.100 mm (0.0039 in)

• valve guide

Chapters

Table of Contents