Checking The Valves And Valve Springs - Yamaha Raptor 90 YFM90RA 2011 Service Manual

CAMSHAFT, ROCKER ARMS AND VALVES
EBS00240
CHECKING THE VALVES AND VALVE
SPRINGS
1. Measure:
• stem-to-guide clearance
Stem-to-guide clearance =
valve guide inside diameter
valve stem diameter
Out of specification
head ass'y.
Stem-to-guide clearance
Intake
0.010 ~ 0.037 mm
(0.0004 ~ 0.0015 in)
<Limit>: 0.08 mm (0.0031 in)
Exhaust
0.025 ~ 0.052 mm
(0.0010 ~ 0.0020 in)
<Limit>: 0.10 mm (0.0039 in)
4 - 15
ENG
–
a
b
→
Replace the cylinder