Yamaha Scorpio, Service Manual

Page: 22 / 300

2 - 5
SPEC
MAINTENANCE SPECIFICATIONS
Value dimensions:
“A” head dia. IN. 33.9 ~ 34.1 mm
EX. 28.4 ~ 28.6 mm
“B” face width IN. 2.26 mm
EX. 2.26 mm
“C” seat width IN. 0.9 ~ 1.1 mm
EX. 0.9 ~ 1.1 mm
“D” margin thickness IN. 0.8 ~ 1.2 mm
EX. 0.8 ~ 1.2 mm
Stem outside dia. IN. 5.975 ~ 5.990 mm
EX. 5.960 ~ 5.975 mm
Guide inside dia. IN. 6.000 ~ 6.012 mm
EX. 6.000 ~ 6.012 mm
Stem-to-guide clearance IN. 0.010 ~ 0.037 mm
EX. 0.025 ~ 0.052 mm
Stem runout limit <0.03 mm>
Valve spring:
Free length
lnner IN. 36.17 mm
EX. 36.17 mm
Outer IN 36.63 mm
EX. 36.63 mm
Set length (valve closed)
lnner IN. 30.5 mm
EX. 30.5 mm
Outer IN. 32 mm
EX. 32 mm
Compressed pressure (installed)
Inner IN. 7.65 ~ 9.35 kg
EX. 7.65 ~ 9.35 kg
Outer IN. 13.1 ~ 16.1 kg
EX. 13.1 ~ 16.1 kg
Model SX-4
B
C
D
A