Checking The Valve Springs - Yamaha YZF-R6 Service Manual

VALVES AND VALVE SPRINGS
e. Apply a fine lapping compound to the valve
face and repeat the above steps.
f. After every lapping procedure, be sure to
clean off all of the lapping compound from
the valve face and valve seat.
g. Apply Mechanic's blueing dye (Dykem) b
onto the valve face.
h. Install the valve into the cylinder head.
i. Press the valve through the valve guide and
onto the valve seat to make a clear impres-
sion.
j. Measure the valve seat width c again. If the
valve seat width is out of specification, reface
and lap the valve seat.
EAS00241

CHECKING THE VALVE SPRINGS

The following procedure applies to all of the
valve springs.
1. Measure:
S valve spring free length a
Out of specification ! Replace the valve
spring.
4-27
ENG
Valve spring free length
Intake valve spring (inner)
37.0 mm
<Limit>: 35mm
Intake valve spring (outer)
38.4 mm
<Limit>: 36.5mm
Exhaust valve spring
41.7 mm
<Limit>: 39.5mm