Robin EC12 - Page 62

Unit : mm (in)
ITEM
CORRECTION
1 STANDARD SIZE
TOLERANCE I - LIMIT
Clearance between small .
end I.D. and Piston pin
needle bearing
0.003 - 0.023
(0.0001 - 0.0009)
0.055 (0.0022)
Large end side clearance
0.1 - 0.5
(0.004 - 0.020)
0.7 (0.028)
Parallelism and Twist
between large end and
small end bores
Parallelism
0.1 (0.004)
0.05 (0.002)
\
Twist
0.3 (0.01 2) 0.1 (0.004)
U
I I I
0 I I I
L
Roundness
MAX. 0.004 (0.0002)
"
c.
P
roundness and cylindricity
g
,
Large end small end I.D.
' Distance between large
c
MAX. 0.004 (0.0002) Cylindricity
c
rn
end and small end bore
c
94
Crankpin 0.0.
c
+ 0.25 0.01 0)
-0.25 (0.01 0)
4 18
9 17.98 (0.708)
Q
%
c
E
MAX. 0.005 (0.0002)
Roundness
"
~
Crankpin O.D. Roundness
and Cylindricity
Cylindricity
MAX. 0,005 (0.0002)
I Crankshaft journal O.D.
I
4%
I +o'003 (+o*ool ) I 424.97 (0.983)
-0.006 -0.002
I Crankshaft end play
I
I 0 - 0.2 (0.008) I 0.6 (0.024)
Crankshaft deviation
0.05 (0.002)
0.1 2 (0.0047)
I
Diaof small end needle bearing
needle
62
Spark plug
Spark timing
Champion
CJ8 or NGK BM.6A
c
W
-
i- 5" * 2"
1 8 O (Fixed)
(before
T.D.C.)
w"
0
(0.012 - 0.020)
Ignition coil air gap
W
(0.024 - 0.028)
Y
spark Plug gap
0.6 - 0.7
L
0
W
-
0.3 - 0.5
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