Installing The Valves And Valve Springs - Yamaha YXR70FX Service Manual

VALVES AND VALVE SPRINGS
h. Press the valve through the valve guide and
onto the valve seat to make a clear pattern.
i. Measure the valve seat width again. If the
valve seat width is out of specification,
reface and relap the valve seat.
L LLL
10.Measure:
• valve spring free length a
Out of specification → Replace.
11.Measure:
• compressed spring force a
Out of specification → Replace.
b Installed length
12.Measure:
• spring tilt a
Out of specification → Replace.
EBS00241
INSTALLING THE VALVES AND VALVE
SPRINGS
The following procedure applies to all of the
valves and related components.
1. Deburr:
• valve stem end
(with an oil stone)
4 - 33
ENG
L LLL L L LLL L L LLL L L LLL
Valve spring free length
40.38 mm (1.59 in)
<Limit>: 38.36 mm (1.51 in)
Compressed spring force
171.0 ~ 197.0 N at 35.00 mm
(17.44 ~ 20.09 kg at 35.00 mm,
38.44 ~ 44.29 lb at 1.38 in)
Spring tilt limit
2.5°/1.80 mm (0.071 in)
L L LLL L LLL