Yamaha 30 HMHS [248/446] Take care not to scratch or cut the alumi num surface

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Yamaha 30 HMHS [248/446] Take care not to scratch or cut the alumi num surface
CRANKSHAFT AND CYLINDER BODY
POWR
5-32
E
A: 15 mm (0.59 in) below the cylinder top
B: 25 mm (0.98 in) above the exhaust port
C: 100 mm (3.94 in) below the scavenging port
CHECKING THE PISTON
1. Ch e ck :
Piston wall
Wear/scratch/damage Replace.
2. Check:
Piston head
Piston ring groove
Carbon deposits Clean.
CAUTION:
Take care not to scratch or cut the alumi-
num surface.
S
SS
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ta
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da
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= =
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1,
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, D
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, D
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r r
r D
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T
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= =
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mm
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or
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22
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) )
) –
– (
((
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MM
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in
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im
mm
mu
uu
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m m
m D
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D5
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5 o
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or
r r
r D
DD
D6
66
6)
))
)
R
R R
R =
= =
= M
MM
Max
axax
axi
ii
im
mm
mu
uu
um
m m
m (
((
(D
DD
D1
1 1
1 –
– D
DD
D2
22
2)
) )
) o
oo
or
r r
r (
((
(D
DD
D3
3 3
3 –
– D
DD
D4
44
4)
) )
) o
oo
or
r r
r (
((
(D
DD
D5
5 5
5 –
D
DD
D6
66
6)
))
)

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