Assembling The Power Unit - Yamaha F80B Service Manual
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Also See for F80B:
- Owner's manual (100 pages) ,
- Service manual (249 pages) ,
- Ower's manual (117 pages)
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Assembling the power unit
1. Install the oil ring 1, second ring 2, and
top ring 3 onto the pistons with the "T"
marks a on the piston rings facing
upward.
2. Offset the piston ring end gaps as
shown.
1
#5
#4
#3
#2
E
CAUTION:
Do not scratch the piston or break the pis-
ton rings.
NOTE:
After installing the piston rings, check that
they move smoothly.
3. Install the upper bearing into the con-
necting rod 4 and the lower bearing into
the connecting rod cap 5.
5
E
6D93G11
a
45˚
45˚
#2
#3
UP
#1,#4
#5
2
3
#1
a
S60C5A70
4
S60C5A80
NOTE:
Install the bearings in their original positions.
4. Install the piston with the "UP" mark on
the piston crown facing towards the fly-
wheel magnet.
NOTE:
Apply engine oil to the side of the pistons and
piston rings before installation.
Piston slider: 90890-06530
5. Install half of the bearings 6 into the cyl-
inder block 7.
b
NOTE:
• Install the bearings in their original posi-
tions.
• Install the unified thrust bearing at the posi-
tion b shown.
Cylinder block
1
2
3
S60C5A90
4
5
6
7
6
7
8
S60C5B10
9
5-50
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