Yamaha EF2000iS Service Manual page 260

Valve:
Valve
Face diameter "A"
Stem diameter "B"
<Limit>
Stem length "C"
Valve face contact
width "D"
<Limit>
Valve seat contact width IN
<Limit>
Valve stem runout limit
"θ"
Valve guide
Guide inside diameter
Stem to guide clearance IN
Valve clearance (cold)
Push rod:
Runout limit
Valve spring:
Free length
<Limit>
Set length
Set force
Tilt limit
MAINTENANCE SPECIFICATIONS
mm (in)
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
EX
IN
EX
IN
EX
EX
IN
EX
mm (in)
mm (in)
IN
EX
IN
EX
IN
EX
IN
EX
7-5
20.0 (0.79)
18.0 (0.71)
4.948 – 4.960 (0.1948 – 0.1953)
4.928 – 4.940 (0.1940 – 0.1945)
4.908 (0.19)
4.908 (0.19)
53.0 (2.09)
53.2 (2.09)
0.6 – 0.8 (0.0236 – 0.0315)
0.6 – 0.8 (0.0236 – 0.0315)
1.6 (0.06)
1.6 (0.06)
0.6 – 0.8 (0.0236 – 0.0315)
0.6 – 0.8 (0.0236 – 0.0315)
1.6 (0.06)
1.6 (0.06)
0.01 (0.0004)
91°
5.000 – 5.012 (0.1969 – 0.1973)
5.000 – 5.012 (0.1969 – 0.1973)
0.040 – 0.064 (0.00157 – 0.00252)
0.060 – 0.084 (0.00236 – 0.00331)
0.07 – 0.12 (0.0028 – 0.0047)
0.07 – 0.12 (0.0028 – 0.0047)
0.5 (0.02)
27.4 (1.0787)
27.4 (1.0787)
24.4 (0.94)
24.4 (0.94)
21.6 (0.8504)
21.6 (0.8504)
4.4 kg (2.7 lb)
4.4 kg (2.7 lb)
0.8 (0.03)
SPEC