Checking The Valve Springs - Yamaha 2004 YP400 Service Manual

VALVES AND VALVE SPRINGS
j. Measure the valve seat width again. If the
L
EAS00241

CHECKING THE VALVE SPRINGS

The following procedure applies to all of the
valve springs.
1. Measure:
2. Measure:
b Installed length
5 - 27
valve seat width is out of specification,
reface and lap the valve seat.
LLL L LLL L L LLL L L LLL
• valve spring free length a
Out of specification → Replace the valve
spring.
Valve spring free length
46.45 mm (1.83 in)
<Limit>: 44.13 mm (1.74 in)
• compressed valve spring force a
Out of specification → Replace the valve
spring.
Compressed valve spring force
(installed)
160.5 ~ 184.7 N at 35.10 mm
(16.37 ~ 18.83 kg at 35.10 mm,
36.08 ~ 41.52 lb at 1.38 in)
ENG
L L LLL L L LLL L LLL