Checking The Valves And Valve Guides - Yamaha YP400T Service Manual

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VALVES AND VALVE SPRINGS

• upper spring seat 1

• valve spring 2

• valve stem seal 3

• lower spring seat 4

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.

• 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)

Troubleshooting