Yamaha 55DEHD - Disassembling the Crankshaft; Checking the Cylinder Bore

6885J11
5-26
9
8
7
6
5
4
3
2
1
Crankcase
cC
Do not reuse the ball bearing, always
replace it with a new one.
Checking the cylinder bore
1. Measure the cylinder bore (D1–D6) at
measuring points a, b, and c, and in
direction d (D
1, D3, D5), which is parallel
to the crankshaft, and direction e (D
2,
D
4
, D6
), which is at a right angle to the
crankshaft.
a:10.0 mm (0.39 in) from the cylinder head top
surface
b:35 mm (1.38 in) from the cylinder head top
surface
c:80 mm (3.15 in) from the cylinder head top
surface
1
a
b
c
d
e
D2
D4
D6
D1
D5
D3
68850430
Cylinder gauge 1:
90890-06759
Cylinder bore diameter (D1–D6):
82.000–82.020 mm
(3.2283–3.2291 in)
Gear puller 4: 90890-06540
Bearing separator 5:
90890-06534
or commercially available tool.
Disassembling the crankshaft
1. Remove the roller bearing.
2. Remove the circlips 1 and main bear-
ings 2.
3. Remove the circlip 3, and then remove
the ball bearing.
6S650340
1
2
1
2
6885042a
3
6885042d
5
4
6885042b
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