Yamaha FX10X Service Manual page 448

VALVES AND VALVE SPRINGS

• After installing the valve guide, bore the valve

guide with the valve guide reamer 3 to obtain

the proper valve-stem-to-valve-guide clearance.

After replacing the valve guide, reface the valve

3. Eliminate:

• Carbon deposits

(from the valve face and valve seat)

• Valve face

Pitting/wear → Grind the valve face.

• Valve stem end

Mushroom shape or diameter larger than the

body of the valve stem → Replace the valve.

• Valve margin thickness a

Out of specification → Replace the valve.

Valve guide remover (ø4.5):

Valve guide remover (4.5 mm):

Valve guide installer (ø4.5):

Valve guide installer (4.5 mm):

Valve guide reamer (ø4.5):

Valve guide reamer (4.5 mm):

Valve margin thickness:

0.80 ~ 1.20 mm

(0.0315 ~ 0.0472 in)

0.50 ~ 0.90 mm

(0.0197 ~ 0.0354 in)

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