Cylinder (Crankcase 1) Inspection; Valve And Valve Spring Assembly - Yamaha EF1000iS Service Manual

CYLINDER (CRANKCASE 1) AND VALVE
a
b
b
a
1
3

CYLINDER (CRANKCASE 1) INSPECTION

1. Measure:
NOTE:
Take side to side a and front to back b mea-
surements at each of the three locations A, B,
C (total of six measurements), and then find
the average of the measurements.
Maximum wear = Maximum A, B, C.

VALVE AND VALVE SPRING ASSEMBLY

1. Install:
2
NOTE:
9 Apply a small amount of molybdenum disul-
fide oil to the valve stem and use the valve
spring compressor 5 to install the parts.
9 Press the spring retainer by your finger
while installing the spring retainer.
3-35
ENG
9 Cylinder inside diameter
Cylinder taper =
Maximum A – Minimum C.
Out of specification → Replace.
Cylinder inside diameter:
41.00 ~ 41.02 mm
(1.614 ~ 1.615 in)
Cylinder inside diameter wear
limit:
41.10 mm (16.18 in)
Cylinder taper limit:
0.05 mm (0.002 in)
9 Valve 1
9 Valve spring 2
9 Valve spring retainer 3