APRILIA MXV 450 - Owner's Manual download pdf (Page 77)

LUBRICATION

3-39

ine 450 - 550

• Using an inner micrometer gauge, measure valve

guide inner diameter (D).

• Calculate valve stem to valve guide clearance (G) as

follows:

G = c – d

Valve stem-to-valve guide clearance: max wear limit,

see (LIMIT VALUES).

• Change the valve guide if clearance is outside

specified range.

• Carry on checking valves and valve guides by

eliminating scale from valve face and seat.

• Ensure that the valve face does not show pitting or

marks of wear; change valve if necessary.

• Check that valve stem end does not have a

"mushroom" shape or has a larger diameter; if so,

change the valve.

• Ensure that value (E) of valve edge mating surface

complies with indicated values, change the valve if

necessary.

Valve mating surface thickness:

0.80 ÷ 1.20 mm (0.0315 ÷ 0.0472 in.)

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APRILIA MXV 450 - Owner's Manual Page 77